AFL1203R3SZ/CHPBF [INFINEON]

DC-DC Regulated Power Supply Module, 1 Output, 66W, Hybrid, 0.380 INCH, LOW PROFILE, SEAM WELDED PACKAGE-12;


型号：	AFL1203R3SZ/CHPBF
厂家：	Infineon
描述：	DC-DC Regulated Power Supply Module, 1 Output, 66W, Hybrid, 0.380 INCH, LOW PROFILE, SEAM WELDED PACKAGE-12
文件：	总9页 (文件大小：85K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

PD - 94448A

AFL1203R3S

120V Input, 3.3V Output

ADVANCED ANALOG

HIGH RELIABILITY

HYBRID DC/DC CONVERTER

Description

The AFL Series of DC/DC converters feature high power

density with no derating over the full military tempera-

ture range. This series is offered as part of a complete

family of converters providing single and dual output

voltages and operating from nominal +28 or +270 volt

inputs with output power ranging from 66 to 120 watts.

For applications requiring higher output power, multiple

converters can be operated in parallel. The internal cur-

rent sharing circuits assure equal current distribution

among the paralleled converters. This series incorpo-

rates Advanced Analog’s proprietary magnetic pulse

feedback technology providing optimum dynamic line

and load regulation response. This feedback system

samples the output voltage at the pulse width modulator

fixed clock frequency, nominally 550 KHz. Multiple con-

verters can be synchronized to a system clock in the

500 KHz to 700 KHz range or to the synchronization

output of one converter. Undervoltage lockout, primary

and secondary referenced inhibit, soft-start and load

fault protection are provided on all models.

AFL

Features

n 80 To 160 Volt Input Range

n 3.3 Volt Output

n High Power Density - 50 W / in

n 66 Watt Output Power

n Parallel Operation with Stress and Current

Sharing

n Low Profile (0.380") Seam Welded Package

n Ceramic Feedthru Copper Core Pins

n High Efficiency - to 74%

n Full Military Temperature Range

n Continuous Short Circuit and Overload

Protection

n Remote Sensing Terminals

n Primary and Secondary Referenced

Inhibit Functions

n Line Rejection > 50 dB - DC to 50KHz

n External Synchronization Port

n Fault Tolerant Design

These converters are hermetically packaged in two en-

closure variations, utilizing copper core pins to mini-

mize resistive DC losses. Three lead styles are avail-

able, each fabricated with Advanced Analog’s rugged

ceramic lead-to-package seal assuring long term

hermeticity in the most harsh environments.

n Dual Output Versions Available

n Standard Military Drawings Available

Manufactured in a facility fully qualified to MIL-PRF-

38534, these converters are available in four screening

grades to satisfy a wide range of requirements. The CH

grade is fully compliant to the requirements of MIL-PRF-

38534 for class H. The HB grade is fully processed and

screened to the class H requirement, but does not have

material element evaluated to the class H requirement.

Both grades are tested to meet the complete group “A”

test specification over the full military temperature range

without output power deration. Two grades with more

limited screening are also available for use in less de-

manding applications. Variations in electrical, me-

chanical and screening can be accommodated.

Contact Advanced Analog for special require-

ments.

www.irf.com

07/10/02

AFL1203R3S

Specifications

ABSOLUTE MAXIMUM RATINGS

Input Voltage

-0.5V to 180V

Soldering Temperature

Case Temperature

300°C for 10 seconds

Operating

Storage

-55°C to +125°C

-65°C to +135°C

Electrical Performance Characteristics -55°C < T_CASE< +125°C, 80V< V_IN< 160V unless otherwise specified.

Group A

Parameter

INPUT VOLTAGE

Subgroups

Test Conditions

Min

Nom

Max

Unit

Note 6

120

160

= 120 Volts, 100% Load

OUTPUT VOLTAGE

3.27

3.23

3.30

3.33

3.37

2, 3

= 80, 120, 160 Volts, Note 6

OUTPUT CURRENT

OUTPUT POWER

Note 6

Note 1

MAXIMUM CAPACITIVE LOAD

10,000

-0.015

µfd

= 120 Volts, 100% Load - Note

+0.015

%/°C

OUTPUT VOLTAGE

TEMPERATURE COEFFICIENT

1, 6

OUTPUT VOLTAGE REGULATION

1, 2, 3

No Load, 50% Load, 100% Load

-10.0

-35.0

+10.0

+35.0

Line

= 80, 120, 160 Volts

Load

= 80, 120, 160 Volts, 100%

OUTPUT RIPPLE VOLTAGE

1, 2, 3

Load,

BW = 10MHz

= 120 Volts

INPUT CURRENT

2, 3

1, 2, 3

3.0

5.0

No Load

= 0

OUT

Inhibit 1

Inhibit 2

Pin 4 Shorted to Pin 2

Pin 12 Shorted to Pin 8

= 120 Volts, 100% Load

INPUT RIPPLE CURRENT

B.W. = 10MHz

= 90% V

1, 2, 3

Note 5

CURRENT LIMIT POINT

OUT

NOM

115

105

125

115

140

Expressed as a Percentage

of Full Rated Load

V_IN= 120 Volts

LOAD FAULT POWER DISSIPATION

1, 2, 3

Overload or Short Circuit

EFFICIENCY

V_IN= 120 Volts, 100% Load

1, 2, 3

SWITCHING FREQUENCY

ISOLATION

500

100

550

600

KHz

MΩ

Input to Output or Any Pin to Case

(except Pin 3). Test @ 500VDC

MIL-HDBK-217F, AIF @ T = 40°C

300

KHrs

MTBF

For Notes to Specifications, refer to page 3

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AFL1203R3S

Elecrical Performance Characteristics (Continued)

Group A

Parameter

Subgroups

Test Conditions

Min

Nom

Max

Unit

ENABLE INPUTS (Inhibit Function)

Converter Off

1, 2, 3

Logical Low, Pin 4 or Pin 12

Note 1

Logical High, Pin 4 and Pin 12 - Note 9

Note 1

-0.5

2.0

0.8

100

µA

Sink Current

Converter On

Sink Current

100

µA

SYNCHRONIZATION INPUT

Frequency Range

1, 2, 3

500

2.0

-0.5

700

0.8

100

KHz

nSec

Pulse Amplitude, Hi

Pulse Amplitude, Lo

Pulse Rise Time

Note 1

Pulse Duty Cycle

LOAD TRANSIENT RESPONSE

Note 2, 8

4, 5, 6

Load Step 50%

Load Step 10%

100%

50%

-450

450

200

µSec

Amplitude

Recovery

4, 5, 6

450

400

µSec

Amplitude

Recovery

LINE TRANSIENT RESPONSE

Note 1, 2, 3

Step = 80

160 Volts

-500

500

µSec

Amplitude

Recovery

TURN-ON CHARACTERISTICS

= 80, 120, 160 Volts. Note 4

Overshoot

Delay

4, 5, 6

Enable 1, 2 on. (Pins 4, 12 high or open)

250

120

mSec

Same as Turn On Characteristics.

LOAD FAULT RECOVERY

LINE REJECTION

MIL-STD-461, CS101, 30Hz to 50KHz

Note 1

Notes to Specifications:

1. Parameters not 100% tested but are guaranteed to the limits specified in the table.

2. Recovery time is measured from the initiation of the transient to where V_OUThas returned to within ±1% of V_OUT

at 50% load.

3. Line transient transition time ≥ 100 µSec.

4. Turn-on delay is measured with an input voltage rise time of between 100 and 500 volts per millisecond.

5. Current limit point is that condition of excess load causing output voltage to drop to 90% of nominal.

6. Parameter verified as part of another test.

7. All electrical tests are performed with the remote sense leads connected to the output leads at the load.

8. Load transient transition time ≥ 10 µSec.

9. Enable inputs internally pulled high. Nominal open circuit voltage ≈ 4.0VDC.

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AFL1203R3S

AFL120XXS Circuit Description

Figure I. AFL Single Output Block Diagram

INPUT

FILTER

DC INPUT

ENABLE 1

OUTPUT

FILTER

PRIMARY

BIAS SUPPLY

+ OUTPUT

+ SENSE

CURRENT

SENSE

SYNC OUTPUT

CONTROL

AMPLIFIER

ERROR

AMP

& REF

SYNC INPUT

CASE

ENABLE 2

SENSE

AMPLIFIER

- SENSE

INPUT RETURN

OUTPUT RETURN

the sense leads should be connected to their respective

output terminals at the converter. Figure III. illustrates a

typical application.

Circuit Operation and Application Information

The AFL series of converters employ a forward switched

mode converter topology. (refer to Figure I.) Operation of

the device is initiated when a DC voltage whose magnitude

is within the specified input limits is applied between pins 1

and 2. If pin 4 is enabled (at a logical 1 or open) the primary

bias supply will begin generating a regulated housekeeping

voltage bringing the circuitry on the primary side of the con-

verter to life. Two power MOSFETs used to chop the DC

input voltage into a high frequency square wave, apply this

chopped voltage to the power transformer. As this switch-

ing is initiated, a voltage is impressed on a second winding

of the power transformer which is then rectified and applied

to the primary bias supply. When this occurs, the input

voltage is shut out and the primary bias voltage becomes

exclusively internally generated.

Inhibiting Converter Output

As an alternative to application and removal of the DC

voltage to the input, the user can control the converter

output by providing TTL compatible, positive logic signals

to either of two enable pins (pin 4 or 12). The distinction

between these two signal ports is that enable 1 (pin 4) is

referenced to the input return (pin 2) while enable 2 (pin 12)

is referenced to the output return (pin 8). Thus, the user

has access to an inhibit function on either side of the isola-

tion barrier. Each port is internally pulled “high” so that

when not used, an open connection on both enable pins

permits normal converter operation. When their use is

desired, a logical “low” on either port will shut the con-

verter down.

The switched voltage impressed on the secondary output

transformer winding is rectified and filtered to provide the

converter output voltage. An error amplifier on the second-

ary side compares the output voltage to a precision refer-

ence and generates an error signal proportional to the dif-

ference. This error signal is magnetically coupled through

the feedback transformer into the controller section of the

converter varying the pulse width of the square wave sig-

nal driving the MOSFETs, narrowing the width if the output

voltage is too high and widening it if it is too low.

Figure II. Enable Input Equivalent Circuit

+5.6V

100K

1N4148

Pin 4 or

Pin 12

Disable

290K

Remote Sensing

2N3904

Connection of the + and - sense leads at a remotely locat-

led load permits compensation for resistive voltage drop

between the converter output and the load when they are

physically separated by a significant distance. This con-

nection allows regulation to the placard voltage at the point

of application.When the remote sensing features is not used,

150K

Pin 2 or

Pin 8

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AFL1203R3S

Internally, these ports differ slightly in their function. In use,

a low on Enable 1 completely shuts down all circuits in the

converter while a low on Enable 2 shuts down the second-

ary side while altering the controller duty cycle to near zero.

Externally, the use of either port is transparent to the user

save for minor differences in idle current. (See specification

table).

high level of +2.0 volts. The sync output of another con-

verter which has been designated as the master oscillator

provides a convenient frequency source for this mode of

operation. When external synchronization is not required,

the sync in pin should be left unconnected thereby permit-

ting the converter to operate at its’ own internally set fre-

quency.

Synchronization of Multiple Converters

The sync output signal is a continuous pulse train set at

550 ±50 KHz, with a duty cycle of 15 ±5%. This signal is

referenced to the input return and has been tailored to be

compatible with the AFL sync input port. Transition times

are less than 100 ns and the low level output impedance is

less than 50 ohms. This signal is active when the DC input

voltage is within the specified operating range and the con-

verter is not inhibited. This output has adequate drive re-

serve to synchronize at least five additional converters. A

typical synchronization connection option is illustrated in

Figure III.

When operating multiple converters, system requirements

often dictate operation of the converters at a common fre-

quency. To accommodate this requirement, the AFL series

converters provide both a synchronization input and out-

put.

The sync input port permits synchronization of an AFL co-

nverter to any compatible external frequency source oper-

ating between 500 and 700 KHz. This input signal should

be referenced to the input return and have a 10% to 90%

duty cycle. Compatibility requires transition times less th

an100 ns, maximum low level of +0.8 volts and a minimum

Figure III. Preferred Connection for Parallel Operation

Power

Input

Enable

Sense

Return

Vin

Rtn

Case

Enable

AFL

Sync Out

Sync In

Vout

Optional

Synchronization

Connection

Share Bus

Enable

Vin

Rtn

Sense

Return

Case

Enable

Sync Out

Sync In

to Load

Vout

Enable

Vin

Rtn

Sense

Return

Case

AFL

Enable

Sync Out

Sync In

Vout

(Other Converters)

Parallel Operation-Current and Stress Sharing

AFL series operating in the parallel mode is that in addition

to sharing the current, the stress induced by temperature

will also be shared. Thus if one member of a paralleled set

is operating at a higher case temperture, the current it pro-

vides to the load will be reduced as compensation for the

temperature induced stress on that device.

Figure III. illustrates the preferred connection scheme for

operation of a set of AFL converters with outputs operating

in parallel. Use of this connection permits equal sharing of

a load current exceeding the capacity of an individual AFL

among the members of the set. An important feature of the

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AFL1203R3S

When operating in the shared mode, it is important that for minor variations of either surface. While other available

symmetry of connection be maintained as an assurance of types of heat conductive materials and compounds may

optimum load sharing performance. Thus, converter out- provide similar performance, these alternatives are often

puts should be connected to the load with equal lengths of

wire of the same gauge and sense leads from each con-

verter should be connected to a common physical point,

preferably at the load along with the converter output and

return leads. All converters in a paralleled set must have

their share pins connected together. This arrangement is

diagrammatically illustrated in Figure III. showing the out-

puts and sense pins connected at a star point which is

located close as possible to the load.

less convinient and are frequently messy to use.

A conservative aid to estimating the total heat sink surface

area (A_{HEAT SINK}) required to set the maximum case temp-

erature rise (∆T) above ambient temperature is given by

the following expression:

−1.43

∆T

HEAT SINK

≈

− 3.0

0.85

As a consequence of the topology utilized in the current

sharing circuit, the share pin may be used for other func-

tions. In applications requiring a single converter, the volt-

age appearing on the share pin may be used as a “current

monitor”. The share pin open circuit voltage is nominally

+1.00v at no load and increases linearly with increasing

output current to +2.20v at full load. The share pin voltage is

referenced to the output return pin.

80P

where

∆T = Case temperature rise above ambient

P = Device dissipation in Watts = P^OUT

Eff

−1

As an example, it is desired to maintain the case tempera-

ture of an AFL27015S at ≤ +85°C in an area where the

ambient temperature is held at a constant +25°C; then

Thermal Considerations

Because of the incorporation of many innovative techno-

logical concepts, the AFL series of converters is capable of

providing very high output power from a package of very

small volume. These magnitudes of power density can only

be obtained by combining high circuit efficiency with effec-

tive methods of heat removal from the die junctions. This

requirement has been effectively addressed inside the de-

vice; but when operating at maximum loads, a significant

amount of heat will be generated and this heat must be

conducted away from the case. To maintain the case tem-

perature at or below the specified maximum of 125°C, this

heat must be transferred by conduction to an appropriate

heat dissipater held in intimate contact with the converter

base-plate.

∆T = 85 - 25 = 60°C

From the Specification Table, the worst case full load effi-

ciency for this device is 83%; therefore the power dissipa-

tion at full load is given by

(

)

120

120 0.205 24.6W

•

−

•

.83

and the required heat sink area is

−1.43

− 3.0 = 71 in²

Because effectiveness of this heat transfer is dependent

on the intimacy of the baseplate/heatsink interface, it is st-

rongly recommended that a high thermal conductivity heat

transferance medium is inserted between the baseplate a-

nd heatsink. The material most frequently utilized at the fa-

ctory during all testing and burn-in processes is sold under

HEAT SINK

80• 24.6^0.85

Thus, a total heat sink surface area (including fins, if any) of

71 in in this example, would limit case rise to 60°C above

ambient. A flat aluminum plate, 0.25" thick and of approxi-

the trade name of Sil-Pad 400 . This particular pro duct

mate dimension 4" by 9" (36 in per side) would suffice for

is an insulator but electrically conductive versions are also

available. Use of these materials assures maximum surfa-

ce contact with the heat dissipator thereby compensating

this application in a still air environment. Note that to meet

the criteria in this example, both sides of the plate require

unrestricted exposure to the ambient air.

Sil-Pad is a registered Trade Mark of Bergquist, Minneapolis, MN

www.irf.com

AFL1203R3S

Input Filter

Finding a resistor value for a particular output voltage, is

simply a matter of substituting the desired output voltage

and the nominal device voltage into the equation and solv-

The AFL120XXS series converters incorporate a LC input

filter whose elements dominate the input load impedance

characteristic at turn-on. The input circuit is as shown in

Figure IV.

ing for the corresponding resistor value.

Figure V. Connection for V_OUTAdjustment

Figure IV. Input Filter Circuit

Enable

16.8uH

Sense

Return

R _ADJ

Pin 1

AFL120xxS

0.78uF

To Load

V_out

Pin 2

Caution: Do not set R_adj< 500Ω

Attempts to adjust the output voltage to a value greater than

120% of nominal should be avoided because of the poten-

tial of exceeding internal component stress ratings and sub-

sequent operation to failure. Under no circumstance should

the external setting resistor be made less than 500Ω. By

remaining within this specified range of values, completely

safe operation fully within normal component derating limits

is assured.

Undervoltage Lockout

A minimum voltage is required at the input of the converter

to initiate operation. This voltage is set to 74 ± 4 volts. To

preclude the possibility of noise or other variations at the

input falsely initiating and halting converter operation, a hys-

teresis of approximately 7 volts is incorporated in this cir-

cuit. Thus if the input voltage droops to 67 ± 4 volts, the

converter will shut down and remain inoperative until the

input voltage returns to ≈ 74 volts.

Examination of the equation relating output voltage and re-

sistor value reveals a special benefit of the circuit topology

utilized for remote sensing of output voltage in the

AFL120XXS series of converters. It is apparent that as the

resistance increases, the output voltage approaches the

nominal set value of the device. In fact the calculated limit-

ing value of output voltage as the adjusting resistor be-

OutputVoltage Adjust

In addition to permitting close voltage regulation of remotely

located loads, it is possible to utilize the converter sense

pins to incrementally increase the output voltage over a

limited range.The adjustments made possible by this method

are intended as a means to “trim” the output to a voltage

setting for some particular application, but are not intended

to create an adjustable output converter. These output volt-

age setting variations are obtained by connecting an appro-

priate resistor value between the +sense and -sense pins

while connecting the -sense pin to the output return pin as

shown in Figure V. below. The range of adjustment and

corresponding range of resistance values can be deter-

comes very large is ≈ 25mV above nominal device voltage.

The consequence is that if the +sense connection is unin-

tentionally broken, an AFL120XXS has a fail-safe output

voltage of Vout + 25mV, where the 25mV is independent of

the nominal output voltage. It can be further demonstrated

that in the event of both the + and - sense connections

being broken, the output will be limited toVout + 440mV. This

440 mV is also essentially constant independent of the nomi-

nal output voltage. While operation in this condition is not

damaging to the device, not at all performance parameters

will be met.

mined by use of the following equation.

NOM

adj

= 100•

OUT

NOM

- V

-.025

Where V_NOM= device nominal output voltage, and

V_OUT= desired output voltage

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AFL1203R3S

AFL1203R3S Case Outlines

Case X

Case W

Pin Variation of Case Y

3.000

2.760

0.128

0.050

0.250

1.000

Ref

1.260 1.500

0.200 Typ

Non-cum

0.040

0.220

2.500

0.220

0.525

2.800

2.975 max

0.238 max

0.42

0.380

Max

0.380

Max

Case Y

Case Z

Pin Variation of Case Y

1.150

0.300

0.140

0.25 typ

0.050

0.250

1.000

Ref

1.500 1.750 2.00

1.000

Ref

0.200 Typ

Non-cum

0.040

0.220

1.750

2.500

0.375

0.36

2.800

2.975 max

0.525

0.238 max

0.380

Max

0.380

Max

Tolerances, unless otherwise specified: .XX

.XXX

±0.010

±0.005

BERYLLIAWARNING: These converters are hermetically sealed;however they contain BeO substrates and should not be ground or subjected to any other

operations including exposure to acids, which may produce Beryllium dust or fumes containing Beryllium

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AFL1203R3S

Available Screening Levels and ProcessVariations for AFL1203R3S Series.

MIL-STD-883

Method

Requirement

Temperature Range

Element Evaluation

Internal Visual

Suffix

-20 to +85°C

-55°C to +125°C

MIL-PRF-38534

2017

1010

2001

1015

Cond B

Temperature Cycle

Constant Acceleration

Burn-in

Cond C

500g

Cond A

48hrs @ 85°C

48hrs @ 125°C

25°C

160hrs @ 125°C

-55, +25, +125°C

160hrs @ 125°C

-55, +25, +125°C

Final Electrical (Group A)

MIL-PRF-38534

& Specification

25°C

Seal, Fine & Gross

External Visual

1014

2009

Cond C

Cond A, C

* per Commercial Standards

AFL1203R3S Pin Designation

Part Numbering

AFL 120 3R3 S X / CH

Pin No.

Designation

Positive Input

Input Return

Case

M odel

Screening

–

E S

Input Voltage

C ase Style

H B, CH

120 = 120V

28 = 28V

W , X, Y, Z

Output Voltage

Outputs

S = Single

D = D ual

Enable 1

3R3 = 3.3V

Sync Output

Sync Input

Positive Output

Output Return

Return Sense

Positive Sense

Enable 2

WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245, Tel: (310) 322 3331

ADVANCED ANALOG: 2270 Martin Av., Santa Clara, California 95050, Tel: (408) 727-0500

Visit us at www.irf.com for sales contact information.

Data and specifications subject to change without notice. 07/02

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AFL1203R3SZ/CHPBF [INFINEON]

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