ATH10T05_技术文档

ATH10T05 Series —5-V Input

10-A, 5-V Input Non-Isolated

Wide-Output Adjust Power Module

REVISION 00 (4DEC2003)

Features

• Up to 10-A Output Current

• 5-V Input Voltage

• Wide-Output Voltage Adjust

(0.8 V to 3.6 V)

• Efficiencies up to 96 %

• 150 W/in³ Power Density

• On/Off Inhibit

• Output Voltage Sense

• Pre-Bias Startup

• Margin Up/Down Controls

• Under-Voltage Lockout

• Auto-Track™ Sequencing

• Output Over-Current Protection

(Non-Latching, Auto-Reset)

• Operating Temp: –40 to +85 °C

• DSP Compatible Output Voltages

• IPC Lead Free 2

• Safety Agency Approvals (Pending)

UL 1950, CSA 22.2 950, &

EN60950

NOMINAL SIZE =

1 in x 0.62 in

(25,4 mm x 15,75 mm)

• Point-of-Load Alliance (POLA)

Compatible

Description

Pin Configuration

Sequencing. Auto-Track simplifies the

The ATH10T05 series non-isolated

powermodule is small in size but big on

performance and flexibility. Its high out-

put current, compact footprint, and

Pin Function

task of supply voltage sequencing in a

power system by enabling modules to

track each other, or any external voltage,

during power up and power down.

1

2

3

4

5

6

7

8

9

GND

V_in

Inhibit *

V_oAdjust

V_oSense

V_out

GND

Track

Margin Down *

industry-leading features offers system

designers a versatile module for powering

complex multi-processor digital systems.

This product employs double-sided

surface mount construction and provides

high-performance step-down power

conversion for up to 10 A of output cur-

rent from a 5-V input bus voltage. The

output voltage is adjustable and can be set

to any value over the range, 0.8 V to 3.6 V,

using a single resistor.

Other operating features include an

on/off inhibit, margin up/down controls,

and the ability to start up into an existing

output voltage or prebias. To ensure tight

load regulation, an output voltage sense

is also provided. A non-latching over-

current trip serves as load fault protection.

Target applications include complex

multi-voltage, multi-processor systems

that incorporate the industry’s high-speed

DSPs, micro-processors and bus drivers.

10 Margin Up *

*

Denotes negative logic:

Open

= Normal operation

Ground = Function active

This series includes Auto-Track™

Standard Application

Track

R

= Resistor to set the desired output

voltage (see spec. table for values)

= Required 330 µF capacitor

= Optional 330 µF capacitor

set

C

Margin Down

Margin Up

in

out

10

9

8

1

2

7

PTH05060W

ATH10T05-9S

(Top View)

V_OUT

V_IN

6

3

4

5

V_oSense

Inhibit

L

O

A

D

R_SET

1 %, 0.1 W

(Required)

+

C_IN

330 µF

(Required)

C_OUT

330 µF

(Optional)

GND

North America (USA): 1-888-41-ASTEC

Europe (UK): 44(1384)842-211

Asia (HK): 852-2437-9662

ATH10T05 Series —5-V Input

10-A, 5-V Input Non-Isolated

Wide-Output Adjust Power Module

REVISION 00 (4DEC2003)

Ordering Information

Input Voltage

4.5V to 5.5V

Output Voltage

0.8V¹to 3.6V

Output Current

10A

Model Number

ATH10T05-9(S)(J)

Options:

“-J”

-

Through-hole Termination, Tray Packaging

SMT Termination, Tray Packaging

SMT Termination, T&R Packaging

“-SJ”

“-S”

Notes:

¹Preset output voltage is 0.8V; externally adjustable to 3.6V through the Vo,Adjust pin

Pin Descriptions

Vin: The positive input voltage power node to the mod-

ule, which is referenced to common GND.

Vo Sense: The sense input allows the regulation circuit to

compensate for voltage drop between the module and

the load. For optimal voltage accuracy Vo Sense should

be connected to Vout. It can also be left disconnected.

Vout: The regulated positive power output with respect

to the GND node.

Track: This is an analog control input that enables the

output voltage to follow an external voltage. This pin

becomes active typically 20 ms after the input voltage

has been applied, and allows direct control of the output

voltage from 0 V up to the nominal set-point voltage.

Within this range the output will follow the voltage at

the Track pin on a volt-for-volt basis. When the control

voltage is raised above this range, the module regulates

at its set-point voltage. The feature allows the output

voltage to rise simultaneously with other modules pow-

ered from the same input bus. If unused, the input may

be left unconnected. Note: Due to the under-voltage lockout,

this feature does not allow the output from the module to follow

its own input voltage during power up. For more information,

consult the related application note.

GND: This is the common ground connection for the

Vin and Vout power connections. It is also the 0 VDC

reference for the control inputs.

Inhibit: The Inhibit pin is an open-collector/drain negative

logic input that is referenced to GND. Applying a low-

level ground signal to this input disables the module’s

output and turns off the output voltage. When the Inhibit

control is active, the input current drawn by the regula-

tor is significantly reduced. If the Inhibit pin is left

open-circuit, the module will produce an output when-

ever a valid input source is applied.

Vo Adjust: A 0.1 W 1 % resistor must be directly connected

between this pin and pin 7 (GND) to set the output voltage

to a value higher than 0.8 V. The temperature stability of

the resistor should be 100 ppm/°C (or better). The set

point range for the output voltage is from 0.8 V to 3.6 V.

The resistor value required for a given output voltage

may be calculated from the following formula. If left

open circuit, the output voltage will default to its lowest

value. For further information on output voltage adjust-

ment consult the related application note.

Margin Down: When this input is asserted to GND, the

output voltage is decreased by 5% from the nominal. The

input requires an open-collector (open-drain) interface.

It is not TTL compatible. A lower percent change can

be accomodated with a series resistor. If unused, the

input may be left unconnected. For further information,

consult the related application note.

Margin Up: When this input is asserted to GND, the output

voltage is increased by 5%. The input requires an open-

collector (open-drain) interface. It is not TTL compatible.

The percent change can be reduced with a series resistor. If

unused, the input may be left unconnected. For further

information, consult the related application note.

0.8 V

V_out– 0.8 V

R_set

= 10 kΩ

– 2.49 kΩ

The specification table gives the preferred resistor values

for a number of standard output voltages.

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Europe (UK): 44(1384)842-211

Asia (HK): 852-2437-9662

ATH10T05 Series —5-V Input

10-A, 5-V Input Non-Isolated

Wide-Output Adjust Power Module

Environmental & Absolute Maximum Ratings (Voltages are with respect to GND)

Characteristics

Symbols

Conditions

Min

Typ

Max

Units

Track Input Voltage

V_track

–0.3

—

V_in+ 0.3

85

V

(i)

Operating Temperature Range

Solder Reflow Temperature

Storage Temperature

T

Over V Range

Surface temperature of module body or pins

—

Per Mil-STD-883D, Method 2002.3

1 msec, ½ Sine, mounted

–40

°C

a

in

(ii)

T_reflow

T

s

215

–40

—

125

Mechanical Shock

TBD

—

G’s

Mechanical Vibration

Mil-STD-883D, Method 2007.2

20-2000 Hz

Suffix H

Suffix S

—

TBD

—

G’s

Weight

Flammability

—

3.7

—

grams

Meets UL 94V-O

Notes: (i) For operation below 0 °C the external capacitors must bave stable characteristics. use either a low ESR tantalum, Os-Con, or ceramic capacitor.

(ii) During reflow of SMD package version do not elevate peak temperature of the module, pins or internal components above the stated maximum. For

further guidance refer to the application note, “Reflow Soldering Requirements for Plug-in Power Surface Mount Products.”

Specifications (Unless otherwise stated, T_a=25 °C, V_in=5 V, V_o=3.3 V, C_in=330 µF, C_out=0 µF, and I_o=I_omax)

ATH10T05

Characteristics

Symbols

Conditions

Min

Typ

Max

Units

(1)

Output Current

I_o

0.8 V ≤ V_o≤ 3.6 V,

60 °C, 200 LFM airflow

25 °C, natural convection

0

—

10

A

Input Voltage Range

Set-Point Voltage Tolerance

Temperature Variation

Line Regulation

Load Regulation

Total Output Variation

V_in

V_otol

∆Reg_temp

∆Reg_line

∆Reg_load

∆Reg_tot

Over I_orange

4.5

—

0.5

10

12

5.5

2

—

V

(2)

%V_o

mV

–40 °C <T_a< +85 °C

Over V_inrange

Over I_orange

Includes set-point, line, load,

(2)

—

3

%V_o

–40 °C ≤ T_a≤ +85 °C

Efficiency

η

I_o=7 A

R_SET= 698 Ω V_o= 3.3 V

—

94

92

91

90

89

86

85

—

R_SET= 2.21 kΩ V_o= 2.5 V

R_SET= 4.12 kΩ V_o= 2.0 V

R_SET= 5.49 kΩ V_o= 1.8 V

R_SET= 8.87 kΩ V_o= 1.5 V

R_SET= 17.4 kΩ V_o= 1.2 V

R_SET= 36.5 kΩ V_o= 1.0 V

%

V_oRipple (pk-pk)

Over-Current Threshold

Transient Response

V_r

I_otrip

20 MHz bandwidth

Reset, followed by auto-recovery

1 A/µs load step, 50 to 100 % I_omax,

C_out=330 µF

—

25

20

—

mVpp

A

t_tr

Recovery Time

V_oover/undershoot

—

70

—

µSec

mV

∆V_tr

100

Margin Up/Down Adjust

Margin Input Current (pins 9 /10)

Track Input Current (pin 8)

Track Slew Rate Capability

Under-Voltage Lockout

∆V_omargin

I_ILmargin

I_ILtrack

dV_track/dt

UVLO

—

5

– 8

—

4.3

3.7

—

–130

—

4.45

—

%

µA

V/ms

(3)

Pin to GND

V_track– V_o≤ 50 mV and V_track< V_o(nom)

V_inincreasing

V_indecreasing

Referenced to GND

(4)

—

V

3.4

Inhibit Control (pin3)

Input High Voltage

Input Low Voltage

V_IH

V_IL

V_in–0.5

–0.2

—

Open

0.6

I_ILinhibit

Input Low Current

Input Standby Current

Switching Frequency

External Input Capacitance

External Output Capacitance

Reliability

Pin to GND

Inhibit (pin 3) to GND, Track (pin 8) open

Over V_inand I_oranges

—

275

330

–130

10

300

—

325

—

15,000

µA

I_ininh

ƒ_s

C_in

C_out

MTBF

mA

kHz

µF

(5)

(6)

0

330

µF

Per Bellcore TR-332

6

TBD

—

10 Hrs

50 % stress, T_a=40 °C, ground benign

Notes: (1) See SOA curves or consult factory for appropriate derating.

(2) The set-point voltage tolerance is affected by the tolerance and stability of R_SET. The stated limit is unconditionally met if R_SEThas a tolerance of 1 %

with 100 ppm/°C or better temperature stability.

(3) A small low-leakage (<100 nA) MOSFET is recommended to control this pin. The open-circuit voltage is less than 1 Vdc.

(4) This control pin has an internal pull-up to the input voltage Vin. If it is left open-circuit the module will operate when input power is applied. A small

low-leakage (<100 nA) MOSFET is recommended for control. For further information, consult the related application note.

(5) A 330 µF input capacitor is required for proper operation. The capacitor must be rated for a minimum of 500 mA rms of ripple current.

(6) An external output capacitor is not required for basic operation. Adding 330 µF of distributed capacitance at the load will improve the transient response.

North America (USA): 1-888-41-ASTEC

Europe (UK): 44(1384)842-211

Asia (HK): 852-2437-9662

ATH10T05 Series —5-V Input

Typical Characteristics

10-A, 5-V Input Non-Isolated

Wide-Output Adjust Power Module

Characteristic Data; V_in=5 V (See Note A)

Safe Operating Area; V_in=5 V (See Note B)

Efficiency vs Load Current

Output Voltage =3.3 V

100

90

80

70

60

50

40

30

20

90

80

70

60

50

V_OUT

3.3 V

2.5 V

2.0 V

1.8 V

1.5 V

1.0 V

Airflow

400LFM

200LFM

100LFM

Nat conv

0

2

4

6

8

10

0

2

4

6

8

10

Iout (A)

Iout - Amps

Output Ripple vs Load Current

Output Voltage =1.5 V

90

80

70

60

50

40

30

20

50

40

30

20

10

0

V_OUT

Airflow

2.5

3.3

2.0

1.8

1.0

1.5

400LFM

200LFM

100LFM

Nat Conv

0

2

4

6

8

10

0

2

4

6

8

10

Iout (A)

Iout - Amps

Power Dissipation vs Load Current

3

2.5

2

1.5

1

0.5

0

2

4

6

8

10

Iout - Amps

The products listed hereunder are prototype or pre-production devices which have not been fully qualified to Astec’s

specifications. Product specifications are subject to change without notice. Astec makes no warranty, either expressed,

implied, or statutory, including implied warranty of merchantability or fitness for a specific purpose, of these products.

Note A: Characteristic data has been developed from actual products tested at 25°C. This data is considered typical data for the Converter.

Note B: SOA curves represent the conditions at which internal components are at or below the manufacturer’s maximum operating temperatures. Derating limits apply to

modules soldered directly to a 4-layer PCB with 1 oz. copper.

North America (USA): 1-888-41-ASTEC

Europe (UK): 44(1384)842-211

Asia (HK): 852-2437-9662

Application Notes

ATH10T03 & ATH10T05 Series

Adjusting the Output Voltage of the ATH10T033

& ATH10T05 Wide-Output Adjust Power Modules

Table 1-2; Output Voltage Set-Point Resistor Values

The V_oAdjust control (pin 4) sets the output voltage of the

ATH10T033 and ATH10T05 products to a value higher than

0.8 V. The adjustment range of the ATH10T033 (3.3-V

V_aReq’d

R_set

V_aReq’d

R_set

2.00

2.05

2.10

2.15

2.20

2.25

2.30

2.35

2.40

2.45

2.50

2.55

2.60

2.65

2.70

2.75

2.80

2.85

2.90

2.95

3.00

3.05

3.10

3.15

3.20

3.25

3.30

3.35

3.40

3.45

3.50

3.55

3.60

4.18 kΩ

3.91 kΩ

3.66 kΩ

3.44 kΩ

3.22 kΩ

3.03 kΩ

2.84 kΩ

2.67 kΩ

2.51 kΩ

2.36 kΩ

2.22 kΩ

2.08 kΩ

1.95 kΩ

1.83 kΩ

1.72 kΩ

1.61 kΩ

1.51 kΩ

1.41 kΩ

1.32 kΩ

1.23 kΩ

1.15 kΩ

1.07 kΩ

988 Ω

0.800

0.825

0.850

0.875

0.900

0.925

0.950

0.975

1.000

1.025

1.050

1.075

1.100

1.125

1.150

1.175

1.200

1.225

1.250

1.275

1.300

1.325

1.350

1.375

1.400

1.425

1.450

1.475

1.50

Open

1

input) is from 0.8 V to 2.5 V , and the ATH10T05 (5-V input)

318 kΩ

158 kΩ

104 kΩ

77.5 kΩ

61.5 kΩ

50.8 kΩ

43.2 kΩ

37.5 kΩ

33.1 kΩ

29.5 kΩ

26.6 kΩ

24.2 kΩ

22.1 kΩ

20.4 kΩ

18.8 kΩ

17.5 kΩ

16.3 kΩ

15.3 kΩ

14.4 kΩ

13.5 kΩ

12.7 kΩ

12.1 kΩ

11.4 kΩ

10.8 kΩ

10.3 kΩ

9.82 kΩ

9.36 kΩ

8.94 kΩ

8.18 kΩ

7.51 kΩ

6.92 kΩ

6.4 kΩ

from 0.8 V to 3.6 V. For an output voltage other than

0.8 V a single external resistor, R_set, must be connected

2

directly between the V_oAdjust and GND pins . Table 1-1

gives the preferred value of the external resistor for a num-

ber of standard voltages, along with the actual output

voltage that this resistance value provides.

For other output voltages the value of the required resistor

can either be calculated using the following formula, or

simply selected from the range of values given in Table 1-2.

Figure 1-1 shows the placement of the required resistor.

0.8 V

V_out– 0.8 V

R_set

= 10 kΩ ·

– 2.49 kΩ

Table 1-1; Preferred Values of R_setfor Standard Output Voltages

V_out(Standard)

R_set(Pref’d Value)

V_out(Actual)

1

3.3 V

2.5 V

2 V

1.8 V

1.5 V

1.2 V

1 V

698 Ω

3.309V

2.502 V

2.010 V

1.803 V

1.504 V

1.202 V

1.005 V

0.8 V

914 Ω

843 Ω

775 Ω

710 Ω

647 Ω

587 Ω

529 Ω

473 Ω

2.21 kΩ

4.12 kΩ

5.49 kΩ

8.87 kΩ

17.4 kΩ

36.5 kΩ

Open

1.55

1.60

1.65

1.70

0.8 V

419 Ω

367 Ω

1.75

1.80

1.85

1.90

5.93 kΩ

5.51 kΩ

5.13 kΩ

4.78 kΩ

4.47 kΩ

Figure 1-1; V_oAdjust Resistor Placement

V_oSense

1.95

10

9

8

5

Notes:

V_IN

V_OUT

2

6

1. Modules that operate from a 3.3-V input bus should

not be adjusted higher than 2.5 V.

PTH05060W

ATH10T05-9S

3

1

7

4

2. Use a 0.1 W resistor. The tolerance should be 1 %, with

temperature stability of 100 ppm/°C (or better). Place

the resistor as close to the regulator as possible. Connect

the resistor directly between pins 4 and 7 using dedicated

PCB traces.

R_SET

0.1 W

1 %

+

C_IN

330 µF

C_OUT

330 µF

(Optional)

(Required)

3. Never connect capacitors from V_oAdjust to either GND or

V_out. Any capacitance added to the V_oAdjust pin will affect

the stability of the regulator.

GND

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Europe (UK): 44(1384)842-211

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Application Notes

ATH10T033 & ATH10T05 Series

over many other tantalum types due to their higher rated

surge, power dissipation, and ripple current capability. As a

caution the TAJ series by AVX is not recommended. This

series has considerably higher ESR, reduced power dissipa-

tion, and lower ripple current capability. The TAJ series

is less reliable than the AVX TPS series when determin-

ing power dissipation capability. Tantalum or Oscon®

types are recommended for applications where ambient

temperatures fall below 0 °C.

ATH10T033/T05: Capacitor Recommendations

Input Capacitor

The recommended input capacitor(s) is determined by

330 µF minimum capacitance, and 500 mA rms mini-

mum ripple current rating.

Ripple current and <150 mΩ equivalent series resistance

(ESR) values are the major considerations, along with

temperature, when designing with different types of capaci-

tors. Tantalum capacitors have a recommended minimum

voltage rating of twice 2× (the maximum DC voltage +

AC ripple). This is standard practice for tantalum capaci-

tors to insure reliability.

Ceramic Capacitors

Ceramic capacitors will compliment electrolytic types.

Adding 10 µF to 47 µF of ceramic capacitance will reduce

ripple on the input and output bus. Output ripple and

transient measurement accuracy is improved by measur-

ing directly across a 10 µF ceramic capacitor.

Output Capacitors (Optional)

The ESR of the bulk (non-ceramic) capacitors must be

equal to, or less than 150 mΩ. Electrolytic capacitors

have marginal ripple performance at frequencies greater

than 400 kHz but excellent low frequency transient re-

sponse. Above the ripple frequency, ceramic capacitors are

necessary to improve the transient response and reduce

any high frequency noise components apparent during

higher current excursions.

Capacitor Table

Table 2-1 identifies the characteristics of capacitors from a

number of vendors with acceptable ESR and ripple current

(rms) ratings. The number of capacitors required at both

the input and output buses is identified for each capacitor

type.

This is not an extensive capacitor list. Capacitors from other

vendors are available with comparable specifications. Those listed

are for guidance. The RMS ripple current rating and ESR

(at 100 kHz) are critical parameters necessary to insure both

optimum regulator performance and long capacitor life.

Tantalum Capacitors

Tantalum type capacitors can be used for the output but

only the AVX TPS, Sprague 593D/594/595 or Kemet

T495/T510 series. These capacitors are recommended

Table 1: Input/Output Capacitors

Capacitor Vendor/

Series

Capacitor Characteristics

Quantity

Working

Voltage

Value (µF)

(ESR) Equivalent

Series Resistance Current @105 °C

(Irms)

Max. Ripple

Physical Size

(mm)

Input

Bus

Output

Bus

Vendor Part Number

Panasonic (FC Radial)

WA (SMT.)

FK (SMT.)

10 V

25 V

16 V

330

470

330

0.117 Ω

0.022 Ω

0080 Ω

0.150 Ω

555 mA

4500 mA

850 mA

670 mA

8×10

1

EEUFC1A331

10×10.2

EEFWA1A331P

EEVFK1E471P

EEVFC1C331P

FC (SMT)

United Chemi-con

PXA (SMT)

PS

10 V

16 V

10 V

16 V

330

390

330

0.024 Ω

0.014 Ω

0.018 Ω

0.120 Ω

3770 mA

5050 mA

3710 mA

555 mA

10×7.7

10×12.5

8×10.5

8×12.5

1

PXA10VC331MJ80TP

16PS330MJ12

10FX390M

FX

LXZ Series

LXZ16VB331M8X12LL

Nichicon (WG)

HD Series

PM Series

25 V

16 V

330

0.150 Ω

0.072 Ω

0.120 Ω

670 mA

760 mA

625 mA

10×10

8×11.5

10×12.5

1

UWG1E331MNR1GS

UHD1A331MPR

UPM1C331MPH6

Sanyo-Os-con (SP)

SVP (SMT)

10 V

470

330

0.015 Ω

0.017 Ω

>4500 mA

>3950mA

10×10.5

8×12

1

10SP470M

10SVP330M

AVX Tantalum

TPS (SMT.)

10 V

330

0.045 Ω

0.060 Ω

1723 mA

1826 mA

7.3L

×5.7W

×4.1H

1

TPSE337M010R0045

TPSV337M010R0060

Kemet Polymer

Tantalum T520/T530

(SMT)

10 V

330

0.040 Ω

0.015 Ω

1800 mA

>3800 mA

4.3W

×7.3L

×4.0H

1

T520X337M010AS

T530X337M010AS

Sprague Tantalum

595D Series

(SMT)

10 V

330

0.100 Ω

0.045 Ω

1040 mA

2360 mA

7.2L

×6W

×4.1H

1

595D337X0010D2T

594D337X0016R2T

North America (USA): 1-888-41-ASTEC

Europe (UK): 44(1384)842-211

Asia (HK): 852-2437-9662

Application Notes

ATH Series of Wide-Output Adjust Power

Modules (3.3/5-V Input)

This is a feature unique to the ATH family, and was

specifically designed to simplify the task of sequencing the

supply voltage in a power system. These and other features

are described in the following sections.

Features of the ATH Family of Non-Isolated

Wide Output Adjust Power Modules

Point-of-Load Alliance

The ATH family of non-isolated, wide-output adjust

power modules are optimized for applications that require

a flexible, high performance module that is small in size.

These products are part of the “Point-of-Load Alliance”

(POLA), which ensures compatible footprint,

interoperability and true second sourcing for customer

design flexibility. The POLA is a collaboration between

Texas Instruments, Artesyn Technologies, and Astec

Power to offer customers advanced non-isolated modules

that provide the same functionality and form factor. Prod-

uct series covered by the alliance includes the ATH06

(6 A), ATH10 (10 A), ATH12/15 (12/15 A), ATH18/22

(18/22 A), and the ATH26/30 (26/30 A).

Power-Up Characteristics

When configured per their standard application all the

ATH products will produce a regulated output voltage fol-

lowing the application of a valid input source voltage. All

the modules include soft-start circuitry. This slows the initial

rate in which the output voltage can rise, thereby limiting

the amount of in-rush current that can be drawn from the

input source. The soft-start circuitry also introduces a short

time delay (typically 5 ms-10 ms) into the power-up

characteristic. This delay is from the point that a valid

input source is recognized, to the initial rise of the output

voltage. Figure 3-1 shows the power-up characteristic of

the 22-A output product (ATH22T05-9xx), operating from a

5-V input bus and configured for a 3.3-V output. The wave-

forms were measured with a 5-A resistive load. The initial

rise in input current when the input voltage first starts to

rise is the charge current drawn by the input capacitors.

From the basic, “Just Plug it In” functionality of the 6-A

modules, to the 30-A rated feature-rich ATH30 Series,

these products were designed to be very flexible, yet simple

to use. The features vary with each product. Table 3-1

provides a quick reference to the available features by

product and input bus voltage.

Figure 3-1

Table 3-1; Operating Features by Series and Input Bus Voltage

Vo (2V/Div)

Iin (2A/Div)

Series

Input Bus

3.3 V

I _OUT

6 A

•

PTHxx050

ATH06

5 V

6 A

12 V

6 A

Vin (5V/Div)

•

3.3 V / 5 V

12 V

10 A

ATH10

PTHxx060

10 A

8 A

3.3 V / 5 V

12 V

15 A

12 A

22 A

18 A

30 A

26 A

HORIZ SCALE: 10ms/Div

PATTHHx1x20/1105

•

3.3 V / 5 V

12 V

PTHxx020

ATH18/22

Over-Current Protection

For protection against load faults, all modules incorporate

output over-current protection. Applying a load that

exceeds the regulator’s over-current threshold will cause

the regulated output to shut down. Following shutdown

a module will periodically attempt to recover by initiating

a soft-start power-up. This is described as a “hiccup” mode

of operation, whereby the module continues in a cycle of

successive shutdown and power up until the load fault is

removed. During this period, the average current flowing

into the fault is significantly reduced. Once the fault is

removed, the module automatically recovers and returns

to normal operation.

•

3.3 V / 5 V

12 V

PTHxx030

ATH26/30

For simple point-of-use applications, the ATH06 (6A)

provides operating features such as an on/off inhibit,

output voltage trim, pre-bias startup (3.3/5-V input only),

and over-current protection. The ATH10 (10 A), and

ATH12/15 (12/15 A) include an output voltage sense, and

margin up/down controls. Then the higher output current,

ATH18/22 (18/22A) and ATH26/30 (26/30A) products incor-

porate over-temperature shutdown protection. All of the

products referenced in Table 3-1 include Auto-Track™.

North America (USA): 1-888-41-ASTEC

Europe (UK): 44(1384)842-211

Asia (HK): 852-2437-9662

Application Notes

ATH Series of Wide-Output Adjust Power

Modules (3.3/5-V Input)

Output On/Off Inhibit

Remote Sense

For applications requiring output voltage on/off control,

each series of the ATH family incorporates an output

Inhibit control pin. The inhibit feature can be used wher-

ever there is a requirement for the output voltage from

the regulator to be turned off.

The ATH10, ATH12/15, ATH18/22, and ATH26/30

products incorporate an output voltage sense pin,

V_oSense. The V_oSense pin should be connected to V_outat the

load circuit (see data sheet standard application). A re-

mote sense improves the load regulation performance of

the module by allowing it to compensate for any ‘IR’ voltage

drop between itself and the load. An IR drop is caused by

the high output current flowing through the small

amount of pin and trace resistance. Use of the remote

sense is optional. If not used, the V_oSense pin can be left

open-circuit. An internal low-value resistor (15-Ω or

less) is connected between the V_oSense and V_out. This en-

sures the output voltage remains in regulation.

The power modules function normally when the Inhibit

pin is left open-circuit, providing a regulated output

whenever a valid source voltage is connected to V_inwith

respect to GND.

Figure 3-2 shows the typical application of the inhibit

function. Note the discrete transistor (Q₁). The Inhibit

control has its own internal pull-up to V_inpotential. The

input is not compatible with TTL logic devices. An open-

collector (or open-drain) discrete transistor is recommended

for control.

With the sense pin connected, the difference between

the voltage measured directly between the V_outand GND

pins, and that measured from V_oSense to GND, is the

amount of IR drop being compensated by the regulator.

This should be limited to a maximum of 0.3 V.

Turning Q₁on applies a low voltage to the Inhibit control

pin and disables the output of the module. If Q₁is then

turned off, the module will execute a soft-start power-up

sequence. A regulated output voltage is produced within

20 msec. Figure 3-3 shows the typical rise in both the

output voltage and input current, following the turn-off

of Q₁. The turn off of Q₁corresponds to the rise in the

waveform, Q₁V_ds. The waveforms were measured with

Note: The remote sense feature is not designed to compensate

for the forward drop of non-linear or frequency dependent

components that may be placed in series with the converter

output. Examples include OR-ing diodes, filter inductors,

ferrite beads, and fuses. When these components are enclosed

by the remote sense connection they are effectively placed

inside the regulation control loop, which can adversely affect

the stability of the regulator.

a 5-A load.

Figure 3-2

V_oSense

Over-Temperature Protection

10

9

8

5

The ATH18/22 and ATH26/30 series of products have

over-temperature protection. These products have an

on-board temperature sensor that protects the module’s

internal circuitry against excessively high temperatures.

A rise in the internal temperature may be the result of a

drop in airflow, or a high ambient temperature. If the

internal temperature exceeds the OTP threshold, the

module’s Inhibit control is automatically pulled low. This

turns the output off. The output voltage will drop as the

external output capacitors are discharged by the load

circuit. The recovery is automatic, and begins with a

soft-start power up. It occurs when the the sensed tem-

perature decreases by about 10 °C below the trip point.

V_IN

V_OUT

2

6

ATH15T05-9S

PTH05020W

3

1

7

4

+

L

O

A

D

C_IN

1,000 µF

C_OUT

330 µF

R_SET

Q₁

BSS138

1 =Inhibit

GND

Figure 3-3

Note: The over-temperature protection is a last resort mecha-

nism to prevent thermal stress to the regulator. Operation at

or close to the thermal shutdown temperature is not recom-

mended and will reduce the long-term reliability of the module.

Always operate the regulator within the specified Safe Operating

Area (SOA) limits for the worst-case conditions of ambient

temperature and airflow.

Vo (2V/Div)

Iin (2A/Div)

Q1Vds (5V/Div)

HORIZ SCALE: 10ms/Div

North America (USA): 1-888-41-ASTEC

Europe (UK): 44(1384)842-211

Asia (HK): 852-2437-9662

Application Notes

ATH Series of Wide-Output Adjust Power

Modules (3.3/5-V Input)

Auto-Track™ Function

The Auto-Track™ function is unique to the ATH family,

and is available with the all “Point-of-Load Alliance”

(POLA) products. Auto-Track™ was designed to simplify

the amount of circuitry required to make the output

voltage from each module power up and power down in

sequence. The sequencing of two or more supply voltages

during power up is a common requirement for complex

mixed-signal applications, that use dual-voltage VLSI ICs

such as DSPs, micro-processors, and ASICs.

each module will rise in unison with other modules, to its

respective set-point voltage.

Figure 3-5 shows the output voltage waveforms from the

circuit of Figure 3-4 after the On/Off Control is set from a

high to a low-level voltage. The waveforms, Vo₁and Vo₂

represent the output voltages from the two power mod-

ules, U₁(3.3 V) and U₂(2.0 V) respectively. Vo₁and Vo₂

are shown rising together to produce the desired simul-

taneous power-up characteristic.

How Auto-Track™ Works

The same circuit also provides a power-down sequence.

Power down is the reverse of power up, and is accom-

plished by lowering the track control voltage back to zero

volts. The important constraint is that a valid input voltage

must be maintained until the power down is complete. It

also requires that Q₁be turned off relatively slowly. This

is so that the Track control voltage does not fall faster than

Auto-Track's slew rate capability, which is 5 V/ms. The

components R₁and C₁in Figure 3-4 limit the rate at

which Q₁can pull down the Track control voltage. The

values of 100 k-ohm and 0.047 µF correlate to a decay

rate of about 0.6 V/ms.

Auto-Track™ works by forcing the module’s output voltage

to follow a voltage presented at the Track control pin. This

control range is limited to between 0 V and the module’s

set-point voltage. Once the track-pin voltage is raised

above the set-point voltage, the module’s output remains

1

at its set-point . As an example, if the Track pin of a 2.5-V

regulator is at 1 V, the regulated output will be 1 V. But

if the voltage at the Track pin rises to 3 V, the regulated

output will not go higher than 2.5 V.

When under track control, the regulated output from

the module follows the voltage at its Track pin on a volt-

for-volt basis. By connecting the Track pin of a number

of these modules together, the output voltages will fol-

low a common signal during power-up and power-down.

The control signal can be an externally generated master

ramp waveform, or the output voltage from another power

supply circuit ³. The Track control also incorporates an

internal RC charge circuit. This operates off the module’s

input voltage to produce a suitable rising waveform at

power up.

The power-down sequence is initiated with a low-to-high

transition at the On/Off Control input to the circuit.

Figure 3-6 shows the power-down waveforms. As the

Track control voltage falls below the nominal set-point

voltage of each power module, then its output voltage

decays with all the other modules under Auto-Track™

control.

Notes on Use of Auto-Track™

1. The Track pin voltage must be allowed to rise above

the module’s set-point voltage before the module can

regulate at its adjusted set-point voltage.

Typical Application

The basic implementation of Auto-Track™ allows for

simultaneous voltage sequencing of a number of Auto-

Track™ compliant modules. Connecting the Track control

pins of two or more modules forces the Track control of

all modules to follow the same collective RC ramp wave-

form, and allows them to be controlled through a single

transistor or switch; Q₁in Figure 3-4.

2. The Auto-Track™ function will track almost any

voltage ramp during power up, and is compatible

with ramp speeds of up to 5 V/ms.

3. The absolute maximum voltage that may be applied to the

Track pin is V_in.

To initiate a power-up sequence, it is recommended that

the Track control be first pulled to ground potential.

This should be done at or before input power is applied

to the modules, and then held for at least 10 ms thereaf-

ter. This brief period gives the modules time to complete

their internal soft-start initialization. Applying a logic-

level high signal to the circuit’s On/Off Control turns

Q₁on and applies a ground signal to the Track pins. After

completing their internal soft-start intialization, the out-

put of all modules will remain at zero volts while Q₁is on.

4. The module will not follow a voltage at its Track control

input until it has completed its soft-start initialization.

This takes about 10 ms from the time that the module

has sensed that a valid voltage has been applied its input.

During this period, it is recommended that the Track

pin be held at ground potential.

5. Once its soft-start initialization is complete, the module

is capable of both sinking and sourcing current when

following the voltage at the Track pin.

6. The Auto-Track™ function can be disabled by

connecting the Track pin to the input voltage (V_in)

through a 1-kΩ resistor. When Auto-Track™ is

disabled, the output voltage will rise faster

10 ms after a valid input voltage has been applied to the

modules, Q₁may be turned off. This allows the track con-

trol voltage to automatically rise toward to the modules'

input voltage. During this period the output voltage of

following the application of input power.

**Auto-Track is a trademark of Texas Instruments, Inc.

North America (USA): 1-888-41-ASTEC

Europe (UK): 44(1384)842-211

Asia (HK): 852-2437-9662

Application Notes

ATH Series of Wide-Output Adjust Power

Modules (3.3/5-V Input)

Figure 3-4; Sequenced Power Up & Power Down Using Auto-Track

U1

10

9

8

5

Track

Vo₁=3.3V

2

6

ATH22T05-9SJ

PTH05020W

V_IN

V_O

+5V

+

Inhibit

3

GND

1

7

4

C_IN

C_OUT

R₂

698

C1

0.047µF

U2

10

9

8

5

On/Off Control

Q1

Track

1

0

= Power Down

= Power Up

BSS138

R1

Vo₂=2V

2

6

100k

ATH15T05-9SJ

PTH05010W

V_IN

V_O

+

Inhibit

3

GND

1

7

4

C_IN

C_OUT

R₃

0V

4k12

Figure 3-5; Simultaneous Power Up with Auto-Track Control

Figure 3-6; Simultaneous Power Down with Auto-Track Control

Vo1 (1V/Div)

Vo2 (1V/Div)

On/Off Control

(5V/Div)

On/Off Input

(5V/Div)

HORIZ SCALE: 5ms/Div

North America (USA): 1-888-41-ASTEC

Europe (UK): 44(1384)842-211

Asia (HK): 852-2437-9662

Application Notes

ATH Series of Wide-Output Adjust Power

Modules (3.3/5-V Input)

Margin Up/Down Controls

Notes:

The ATH10 (10A), ATH12/15 (12/15A), ATH18/22 (18/

22A) and ATH26/30 (26/30A) products incorporate Margin

Up and Margin Down control inputs. These controls allow

1. The Margin Up* and Margin Dn* controls were not

intended to be activated simultaneously. If they are

their affects on the output voltage may not completely

cancel, resulting in the possibility of a slightly higher

error in the output voltage set point.

1

the output voltage to be momentarily adjusted , either up

or down, by a nominal 5 %. This provides a convenient

method for dynamically testing the operation of the load

circuit over its supply margin or range. It can also be used to

verify the function of supply voltage supervisors. The

5 % change is applied to the adjusted output voltage, as set

by the external resistor, R_setat the V_oAdjust pin.

2. The ground reference should be a direct connection to

the module GND at pin 7 (pin 1 for the ATH06).

This will produce a more accurate adjustment at the

load circuit terminals. The transistors Q₁and Q₂should

be located close to the regulator.

The 5 % adjustment is made by pulling the appropriate

margin control input directly to the GND terminal .

3. The Margin Up and Margin Dn control inputs are not

compatible with devices that source voltage. This includes

TTL logic. These are analog inputs and should only be

controlled with a true open-drain device (preferably

a discrete MOSFET transistor). The device selected

should have low off-state leakage current. Each input

sources 8 µA when grounded, and has an open-circuit

voltage of 0.8 V.

2

A low-leakage open-drain device, such as an n-channel

MOSFET or p-channel JFET is recommended for this

3

purpose . Adjustments of less than 5 % can also be accom-

modated by adding series resistors to the control inputs

(See Figure 3-4). The value of the resistor can be selected

from Table 3-2, or calculated using the following formula.

Up/Down Adjust Resistance Calculation

To reduce the margin adjustment to something less than

5 %, series resistors are required (See R_Dand R_Uin

Figure 3-7). For the same amount of adjustment, the

resistor value calculated for R_Uand R_Dwill be the same.

The formulas is as follows.

Table 3-2; Margin Up/Down Resistor Values

% Adjust

R_U/ R_D

0.0 kΩ

5

4

3

2

1

24.9 kΩ

66.5 kΩ

499

∆%

R_Uor R_D=

– 99.8

kΩ

150.0 kΩ

397.0 kΩ

Where ∆% = The desired amount of margin adjust in

percent.

Figure 3-7; Margin Up/Down Application Schematic

10

9

8

1

7

6

+V_o

0V

PTH05010W

ATH15T05-9S

(Top View)

V_IN

+V_OUT

2

3

4

5

R_D

R_U

+

R_SET

0.1 W, 1 %

+

C_in

MargDn

MargUp

C_out

L

O

A

D

Q₁

Q₂

GND

North America (USA): 1-888-41-ASTEC

Europe (UK): 44(1384)842-211

Asia (HK): 852-2437-9662

Application Notes

ATH Series of Wide-Output Adjust Power

Modules (3.3/5-V Input)

Notes

Pre-Bias Startup Capability

Only selected products in the ATH family incorporate this

capability. Consult Table 3-1 to identify which products

are compliant.

1. Startup is the relatively short period (approx. 10 ms)

prior to the output voltage rising. The startup period

immediately follows either the application of a valid

input source voltage, or the release of a ground signal

at the Inhibit pin.

A pre-bias startup condition occurs as a result of an external

voltage being present at the output of a power module prior

to its output becoming active. This often occurs in com-

plex digital systems when current from another power

source is backfed through a dual-supply logic component,

such as an FPGA or ASIC. Another path might be via

clamp diodes as part of a dual-supply power-up sequencing

arrangement. A prebias can cause problems with power

modules that incorporate synchronous rectifiers. This is

because under most operating conditions, these types of

modules can sink as well as source output current.

2. To ensure that the regulator does not sink current when

power is first applied (even with a ground signal applied

to the Inhibit control pin), the input voltage must always

be greater than the output voltage throughout the

power-up and power-down sequence.

3. The Auto-Track function can be disabled at power up

by immediately applying a voltage to the module’s Track

pin that is greater than its set-point voltage. This can

be easily accomplished by connecting the Track pin to

V_inthrough a 1-kΩ resistor.

The ATH family of power modules incorporate synchro-

1

nous rectifiers, but will not sink current during startup ,

or whenever the Inhibit pin is held low. However, to ensure

satisfactory operation of this function, certain conditions

must be maintained. Figure 3-7 shows an application

Figure 3.9; Pre-Bias Startup Waveforms

2

demonstrating the pre-bias startup capability. The start-

up waveforms are shown in Figure 3-9. Note that the

output current from the ATH15T033-9xx (I_o) shows neg-

ligible current until its output voltage rises above that

backfed through diodes D₁and D₂.

Vin (1 V/Div)

Vo (1 V/Div)

Note: The pre-bias start-up feature is not compatible with

Auto-Track. When the module is under Auto-Track control, it

is fully active and will sink current if the output voltage is

below that of a back-feeding source. Therefore to ensure a pre-

bias hold-off, one of two approaches must be followed when

input power is applied to the module. The Auto-Track function

Io (5 A/Div)

3

must either be disabled , or the module’s output held off using

the Inhibit pin. The latter allows Auto-Track’s internal (RC)

voltage ramp to rise above the set-point voltage.

HORIZ SCALE: 5 ms/Div

Figure 3.8; Application Circuit Demonstrating Pre-Bias Startup

V_IN= 3.3 V

R₁

1k0

10

9

8

5

D₁, D₂

Track

Sense

MBR3100

V_o= 2.5 V

+

2

6

V_IN

Inhibit

V_O

ATH15T033-9S

PTH03010W

GND

Vadj

4

I_o

3

1

7

VCCIO

VCORE

R₂

2k21

+

C_IN

C_OUT

330 µF

ASIC

North America (USA): 1-888-41-ASTEC

Europe (UK): 44(1384)842-211

Asia (HK): 852-2437-9662

Through Hole Termination

Surface Mount Termination


型号：	ATH10T05
厂家：	Astec America, Inc
描述：	10-A, 5-V Input Non-Isolated Wide-Output Adjust Power Module 10 -A ， 5 - V输入非隔离宽输出调节电源模块电源电路
文件：	总14页 (文件大小：834K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

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