PT4520_技术文档

PT4520 Series

20-W 48-V Input Isolated

DC/DC Converter

SLTS148B - JUNE 2000 - REVISED OCTOBER 2002

Features

• Input Voltage Range:

36V to 75V

• Remote On/Off

• Differential Remote Sense

• Short Circuit Protection

• Over Temperature Shutdown

• Space Saving Package:

1.0 sq. in. PCB Area (Suffix N)

• Safety Approvals Pending

• 20W Rated

• Output Voltages: 1.2V to 15V

• 82% Efficiency

• 1500 VDC Isolation

• Low Profile (8.5 mm)

• Adjustable Output Voltage

6

• 4×10 Hrs MTBF

Pin-Out Information

Description

Ordering Information

Pin Function

PT4521r = 3.3V/5A (16.5W)

PT4522r = 5.0V/4A

The PT4520 Excalibur™ power modules

are a series of isolated DC/DC converters

housed a new space-saving copper case. The

series includes a number of standard output

voltages ranging from as low as 1.2VDC to

15VDC, each adjustable by up to 10% of

nominal. The modules are ideal for Telecom,

Industrial, Computer, and other distributed

power applications that require input-to-output

isolation.

*

1

Remote On/Off

PT4523r = 12V/1.6A

PT4524r = 15V/1.3A

PT4526r = 1.5V/5A (7.5W)

PT4527r = 1.8V/5A (9W)

PT4528r = 2.5V/5A (12.5W)

PT4529r = 1.2V/5A (6W)

2

–V

in

–V

in

+V

in

+V

in

3

4

5

6

Remote Sense (–)

–Vout

7

8

–Vout

PT Series Suffix

(PT1234x)

9

+Vout

Case/Pin

Order

Package

Using multiple modules, system designers

can implement a complete custom power supply

solution. The flexibility of full isolation also

allows the input or output to be configured for

negative voltage operation.

The PT4520 series is electrically equivalent

to the popular PT4120 series and requires no

additional components for proper operation.

Configuration

Suffix

Code

10

11

12

+Vout

Vertical

Horizontal

SMD

N

A

C

(ELJ)

(ELK)

(ELL)

Remote Sense (+)

V

Adjust ^*

out

*

For further information, see

application notes.

(Reference the applicable package code draw-

ing for the dimensions and PC board layout)

Standard Application

Remote Sense (+)

11

+V_OUT

9, 10

+V_IN

4, 5

LOAD

PT4520

–V_IN

2, 3

–V_OUT

7, 8

1

12

6

Remote Sense (–)

V_OAdj

Remote

On/Off

Q₁

BSS138

For technical support and more information, see inside back cover or visit www.ti.com

PT4520 Series

20-W 48-V Input Isolated

DC/DC Converter

SLTS148B - JUNE 2000 - REVISED OCTOBER 2002

Specifications (Unless otherwise stated, T_a=25°C, V_in=48V, C_out=0µF, and I_o=I_omax)

PT4520 SERIES

Characteristic

Symbol

Conditions

Min

Typ

Max

Units

(1)

Output Current

I_o

Over V_inrange

V_o= 15V

V_o= 12V

V_o=5.0V

V_o≤3.3V

0.1

—

1.3

1.6

4

0.1 ⁽¹⁾

A

(1)

0.1

(1)

0.1

5

Input Voltage Range

Set-Point Voltage Tolerance

Temperature Variation

Line Regulation

Load Regulation

Total Output Voltage Variation

V_in

Over I_oRange

36

—

48

1

0.5

0.2

0.4

75

1.5

—

1

VDC

%V_o

(2)

V_otol

Reg_temp

Reg_line

Reg_load

∆V_otot

–40° ≤T_a≤ +85°C, I_o=I_omin

Over V_inrange

Over I_orange

Includes set-point, line, load,

–40° ≤T_a≤ +85°C

(2)

1

—

2

3

%V_o

Efficiency

η

V_o= 15V

V_o= 12V

V_o=5.0V

V_o=3.3V

V_o=1.8V

V_o=1.5V

V_o=1.2V

—

86

83

82

78

67

65

59

—

%

V_oRipple (pk-pk)

V_r

20MHz bandwidth

V_o≥5.0V

V_o≤3.3V

—

0.5

15

100

3

150

200

10

650

850

—

%V_o

mV_pp

µs

%V_o

mV

Transient Response

t_tr

0.1A/µs load step, 50% to 100% I_omax

V_oover/undershoot

V_o≥5.0V

V_o≤3.3V

∆V_tr

Current Limit Threshold

Output Voltage Adjust

Switching Frequency

I_lim

V_oadj

ƒ_s

V_in=36V, ∆V_o= –50mV

%I_omax

%

Over V_inrange

V_o≥5.0V

V_o≤3.3V

600

800

—

700

900

—

kHz

V

Under-Voltage Lockout

UVLO

31

Remote On/Off (Pin 1)

High-Level Input Voltage

Low-Level Input Voltage

Low-Level Input Current

Referenced to –V_in(pin 2)

pins 1 & 2 connected

(3)

V_IH

V_IL

I_IL

2.5

—

–10

7

0.5

—

Open

0.8

–

10

—

220

V

–0.2

—

0

µA

mA

µF

Standby Input Current

Internal Input Capacitance

External Output Capacitance

I_instandby

C_in

C_out

(4)

Isolation Voltage

Capacitance

Resistance

Input–output/input–case

Input to output

1500

—

1100

—

V

pF

MΩ

Input to output

10

(5)

Operating Temperature Range

Solder Reflow Temperature

Storage Temperature

Reliability

T

T_reflow

Over V_inrange

Surface temperature of module pins or case

—

–40

—

–40

—

85

215

125

°C

a

(6)

T

s

MTBF

Per Bellcore TR-332

6

4

—

10 Hrs

50% stress, T_a=40°C, ground benign

Mechanical Shock

—

Per Mil-Std-883D, method 2002.3,

1mS, half-sine, mounted to a fixture

—

500

—

G’s

(7)

Mechanical Vibration

—

Mil-Std-883D, method 2007.2,

20-2000Hz , soldered

Suffix N

Suffixes A & C

—

20

—

G’s

20

Weight

Flammability

—

23

—

grams

Materials meet UL 94V-0

Notes: (1)The DC/DC converter will operate at no load with reduced specifications.

(2) For optimum voltage accuracy the ‘Remote Sense (+)’ and ‘Remote Sense (–)’ pins must be connected to +V_outand –V_outrespectively.

(3)The Remote On/Off (pin 1) has an internal pull-up, and if it is left open circuit the PT4520 will operastaeppwliehde.nReifnerputto thpeower

application notes for interface considerations.

i

(4)External output capacitance is not required for proper operation. Capacitamce may be added to improve threanrsieesnpotsn.sTe hetomaloxaimd umt

total capacitance (including the load circuit) must not exceed 220µF, and the combined ESR of must not be less than 100mΩ.

(5)See Safe Operating Area curves or contact the factory for the appropriate derating.

(6)During solder reflow of SMD package version do not elevate the module case, pins, or internal component tpeemakpeorfa2tu1r5e°sC.aFbovre

a

further guidance refer to the application note, “Reflow Soldering Requirements for Plug-in Power Surface Mount Products,” (SLTA051).

(7)The case pins on the through-hole package types (suffixes

N & A) must be soldered. For more informationacksaegee otuhtelinaepdprliacwabilneg. p

For technical support and more information, see inside back cover or visit www.ti.com

Typical Characteristics

PT4520 Series

20-W 48-V Input Isolated

DC/DC Converter

SLTS148B - JUNE 2000 - REVISED OCTOBER 2002

PT4521, 3.3 VDC (See Note A)

PT4522, 5 VDC (See Note A)

PT4523, 12 VDC (See Note A)

Efficiency vs Output Current

90

80

70

60

50

90

80

70

60

50

90

V_IN

36.0V

48.0V

60.0V

72.0V

V_IN

80

36.0V

48.0V

60.0V

72.0V

36.0V

48.0V

60.0V

72.0V

70

60

50

0

1

2

3

4

5

0

1

2

3

4

0

0.4

0.8

1.2

1.6

Iout (A)

Ripple vs Output Current

50

40

30

20

10

0

50

40

30

20

10

0

50

40

30

20

10

0

V_IN

72.0V

60.0V

48.0V

36.0V

72.0V

60.0V

48.0V

36.0V

72.0V

60.0V

48.0V

36.0V

0

1

2

3

4

0

0.4

0.8

1.2

1.6

0

1

2

3

4

5

Iout (A)

Power Dissipation vs Output Current

6

5

4

3

2

1

0

6

5

4

3

2

1

0

6

5

4

3

2

1

0

V_IN

72.0V

60.0V

48.0V

36.0V

72.0V

60.0V

48.0V

36.0V

72.0V

60.0V

48.0V

36.0V

0

1

2

3

4

5

0

0.4

0.8

1.2

1.6

0

1

2

3

4

Iout (A)

Safe Operating Area, V_in=48V (See Note B)

90

80

70

60

50

40

30

20

90

80

70

60

50

40

30

20

90

80

70

60

50

40

30

20

Airflow

300LFM

200LFM

100LFM

Nat conv

300LFM

200LFM

100LFM

Nat conv

300LFM

200LFM

100LFM

Nat conv

0

1

2

3

4

5

0

1

2

3

4

0

0.25 0.5 0.75

1

1.25 1.5 1.75

Iout (A)

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

For technical support and more information, see inside back cover or visit www.ti.com

Application Notes

PT4500/PT4520 Series

Operating Features and System Considerations for

the PT4500/PT4520 DC/DC Converters

Output Current Limit

The PT4500 and PT4520 series of DC/DC converters

incorporate an output current limit. This protects both the

module and upstream source against load faults. Applying

a load, in excess of the current limit threshold, will sim-

ply cause the output voltage to drop. The output current

remains limited, but continues to flow in the fault. The

drop in output voltage will vary according to the severity

of the fault. Applying a short circuit to the output will

result in an output voltage of zero, and the fault current

will be limited to a value slightly higher than the current

limit threshold. Upon the removal of the load fault, the

output voltage of the module will fully recover to its

normal regulated output voltage.

Turn-On Time

The typical turn-on time is typically 35 milliseconds at

V_in=48V. This is from application of input power, or the

removal of a low-voltage signal from the Remote On/Off

(pin 1). This includes about about 5–10ms of delay time

before the output voltage begins to rise. Turn-on time

will vary slightly with input voltage, output load, and the

total amount of capacitance connected to the output.

Input Current Limiting

The converter is not internally fused. For safety and

overall system protection, the maximum input current to

the converter must be limited. Active or passive current

limiting can be used. Passive current limiting can be a

fast acting fuse. A 125-V fuse, rated no more than 5A, is

recommended. Active current limiting can be imple-

mented with a current limited “Hot-Swap” controller.

Primary-Secondary Isolation

The PT4500 and PT4520 series of DC/DC converters

incorporate electrical isolation between the input termi-

nals (primary) and the output terminals (secondary). All

converters are production tested to a withstand voltage

of 1500VDC. The isolation complies with UL60950 and

EN60950, and the requirements for operational isolation.

This allows the converter to be configured for either a

positive or negative input voltage source.

Thermal Considerations

Airflow may be necessary to ensure that the module can

supply the desired load current in environments with

elevated ambient temperatures. The required airflow

rate may be determined from the Safe Operating Area

(SOA) thermal derating curves. These are provided in

the “Typical Characteristics” section of the converter

specifications.

Output Voltage Adjustment

The output voltage is typcially adjustable over a range of

10% of nominal. Consult the separate application note,

“Ajusting the Output Voltage of the PT4500/PT4520

Series of Isolated DC/DC Converters.”

Remote On/Off Function

The output voltage from the converter can be turned off

from the primary side using the Remote On/Off control

(pin 1). Consult the separate application note, “Using

the Remote On/Off Function on the PT4500/PT4520

Series of Isolated DC/DC Converters.”

Under-Voltage Lock-Out

The Under-Voltage Lock-Out (UVLO) circuit prevents

operation of the converter whenever the input voltage to

the module is insufficient to maintain output regulation.

Below the UVLO threshold the module is off and the

Remote On/Off control (pin 1) is inoperative. Table 1-2

gives the applicable UVLO thresholds.

Table 1-2; UVLO Thresholds

Series

UVLO Threshold

V_inRange

PT4520

PT4500

31V Typical

16.5V Typical

36 – 75V

18 – 40V

For technical support and more information, see inside back cover or visit www.ti.com

Application Notes

PT4500/4520 Series

Adjusting the Output Voltage of the PT4500/

PT4520 Series of Isolated DC/DC Converters

The factory pre-set output voltage of TI’s PT4500 and

PT4520 series of isolated DC/DC converters may be

adjusted within a nominal 10% range. Adjustment is made

4. Never connect capacitors to V_oadjust. Any

capacitance added to the V_oadjust control pin will

affect the stability of the converter.

1

from the secondary side of the regulator with a single

The values of (R₁) [adjust down], and R₂[adjust up], can

also be calculated using the following formulas.

external resistor. For the input voltage range specified in

the data sheet Table 2-1 gives the allowable adjustment

range for each model, as V_o(min) and V_o(max).

K_o(V_a– V_r)

V_r(V_o– V_a)

Adjust Up: An increase in the output voltage is obtained

by adding a resistor, R₂between V_oAdjust (pin 12), and

–V_out(pin 7, 8).

(R₁)

R₂

=

– R_s

kΩ

K_o

(V_a– V_o)

– R_s

Adjust Down: Add a resistor (R₁), between V_oAdjust (pin 12),

and +V_out(pin 9, 10).

Where V_o= Original output voltage

V_a= Adjusted output voltage

Refer to Figure 2-1 and Table 2-2 for both the placement

and value of the required resistor, (R₁) or R₂.

V_r= Reference voltage (Table 2-1)

K_o= Multiplier constant (Table 2-1)

R_s= Internal series resistance (Table 2-1)

Notes:

1. The PT4500 and PT4520 series of DC/DC converters

incorporate isolation between the V_inand V_o

terminals. Adjustment of the output voltage is made

to the regulation circuit on the secondary or output

side of the converter.

Figure 2-1

2. The maximum rated output power for this series is

20W. An increase in the output voltage may therefore

require a corresponding reduction in the maximum

output current (see Table 2-1). The revised maximum

output current must be determined as follows.

+V _o

+V_in

(R1)

Adj Down

4, 5

2, 3

9,10

7, 8

+Vin

+Vout

PT4500/4520

20

–Vin

–Vout

I_o(max)

=

A,

or 5A, whichever is less.

Remote

V

_o(adj)

12

V_a

R2

Adjust Up

On/Off

1

Where V_ais the adjusted ouput voltage.

–V_in

–V_o

3. Use only a single 1% resistor in either the (R₁) or R₂

location. Place the resistor as close to the module as

possible.

Table 2-1

DC/DC CONVERTER ADJUSTMENT RANGE AND FORMULA PARAMETERS

Series Pt #

48V Bus

24V Bus

Max Current ²

V_o(nom)

Va(min)

Va(max)

V_r

PT4529

PT4509

5A

PT4526

PT4506

5A

PT4527

PT4507

5A

PT4528

PT4508

5A

PT4521

PT4501

5A

PT4522

PT4502

4A

PT4523

PT4524

PT4504

1.3A

15.0

13.5

16.5

2.5

137.6

90.9

PT4503

1.6A

12.0

10.8

13.2

2.5

139.8

110.0

1.2

1.05

1.35

0.6125

34.66

150.0

1.5

1.35

1.65

1.225

67.07

43.2

1.8

1.62

1.98

1.225

69.7

2.5

2.25

2.75

1.225

64.2

3.3

2.95

3.65

1.225

69.3

5.0

4.5

5.5

2.5

125.2

187.0

K_o(V·kΩ)

R_s(kΩ)

110.0

187.0

For technical support and more information, see inside back cover or visit www.ti.com

Application Notes continued

PT4500/4520 Series

Table 2-2

DC/DC CONVERTER SERIES ADJUSTMENT RESISTOR VALUES

Series Pt #

48V Bus

24V Bus

V_o(nom)

V_a(req’d)

PT4529

PT4509

1.2Vdc

PT4526

PT4506

1.5Vdc

PT4527

PT4507

1.8Vdc

PT4528

PT4508

2.5Vdc

PT4521

PT4501

3.3Vdc

PT4522

PT4502

5.0Vdc

PT4523

PT4503

12.0Vdc

PT4524

PT4504

15.0Vdc

V_a(req’d)

10.8

11.0

11.2

11.4

11.6

11.8

12.0

12.2

12.4

12.6

12.8

13.0

13.2

13.5

13.6

13.8

14.0

14.2

14.4

14.6

14.8

15.0

15.2

15.4

15.6

15.8

16.0

16.5

(276.0)kΩ

(365.0)kΩ

(497.0)kΩ

(719.0)kΩ

(1.16)MΩ

1.05

1.1

1.15

1.2

1.25

1.3

1.35

1.4

1.45

1.5

1.55

1.6

1.65

1.7

1.75

1.8

1.85

1.9

1.95

2.25

2.3

2.35

2.4

2.45

2.5

2.55

2.6

2.65

2.7

2.75

2.95

3.0

3.05

3.1

(15.1)kΩ

(126.0)kΩ

(458.0)kΩ

4.5

4.55

4.6

4.65

4.7

4.75

4.8

4.85

4.9

4.95

5.0

5.05

5.1

5.15

5.2

(12.6)kΩ

(40.3)kΩ

(75.0)kΩ

(120.0)kΩ

(179.0)kΩ

(262.0)kΩ

(387.0)kΩ

(595.0)kΩ

(1.01)MΩ

543.0kΩ

197.0kΩ

81.1kΩ

(2.8)kΩ

(53.2)kΩ

(204.0)kΩ

588.0kΩ

239.0kΩ

123.0kΩ

64.6kΩ

29.7kΩ

6.4kΩ

1.3MΩ

627.0kΩ

404.0kΩ

(51.7)kΩ

(161.0)kΩ

(489.0)kΩ

1.06MΩ

645.0kΩ

437.0kΩ

312.0kΩ

229.0kΩ

169.0kΩ

125.0kΩ

90.2kΩ

(312.0)kΩ

(345.0)kΩ

(427.0)kΩ

(542.0)kΩ

(713.0)kΩ

(1.0)MΩ

5.25

5.3

5.35

5.4

5.45

5.5

1.28MΩ

587.0kΩ

355.0kΩ

(26.5)kΩ

(92.9)kΩ

(203.0)kΩ

(425.0)kΩ

(1.09)MΩ

(1.57)MΩ

62.4kΩ

597.0kΩ

253.0kΩ

138.0kΩ

81.0kΩ

46.6kΩ

0.8kΩ

1.09MΩ

450.0kΩ

237.0kΩ

131.0kΩ

67.7kΩ

(90.7)kΩ

(146.0)kΩ

(224.0)kΩ

(341.0)kΩ

(536.0)kΩ

(926.0)kΩ

(2.09.0)MΩ

3.15

3.2

3.25

3.3

3.35

3.4

3.45

3.5

3.55

3.6

1.19MΩ

502.0kΩ

272.0kΩ

158.0kΩ

88.7kΩ

42.7kΩ

3.65

9.9kΩ

R1 = (Blue)

R2 = Black

For technical support and more information, see inside back cover or visit www.ti.com

Application Notes

PT4500/4520 Series

Using the Remote On/Off Function on the PT4500/

PT4520 Series of Isolated DC/DC Converters

Figure 3-1

For applications requiring output voltage on/off control,

the PT4500/4520 series of DC/DC converters incorporate

a remote on/off function. This function may be used in

applications that require battery conservation, power-up/

shutdown sequencing, and/or to coordinate the power-up

of the regulator for active in-rush current control. (See

the related application note, SLTA021).

+V _o

4, 5

2, 3

9,10

7, 8

+Vin

+Vout

+V_in

PT4500/4520

–Vin

–Vout

Remote

V

_o(adj)

6

On/Off

1

–V_o

This function is provided by the Remote On/Off control,

pin1. If pin 1 is left open-circuit, the converter provides

a regulated output whenever a valid source voltage³is

applied between +V_in(pin 4, 5), and –V_in(pin 2, 3).

Connecting pin 1 to pin 2, or applying a low-level signal

to pin 1 (with respect to –V_in), ¹will disable the regulator

output ⁵.

Q1

BSS138

V_GS

Note

4

–V_in

Table 3-1 provides details of the interface requirements

for the Remote On/Off pin. Figure 3-1 shows how a discrete

MOSFET (Q₁), may be referenced to the negative input

voltage rail and used with this control input.

Turn-On Time: The converter typically produces a fully

regulated output voltage within 35ms after the removal

of the low voltage signal from the Remote On/Off pin.

Using the circuit of Figure 3-1, Figure 3-2 shows the

output voltage and input current waveforms of a PT4521

after Q₁is turned off. The turn off of Q₁corresponds to

the drop in Q₁Vgs voltage. The waveforms were mea-

sured with a 48Vdc input voltage, and 2.75-A resistive

load.

Table 3-1 Inhibit Control Requirements ¹

Parameter

Min

Max

Enable (V_IH

)

2.5V

–0.3V

(Open Circuit) ⁴

0.8V

Disable (V_IL

)

Notes:

1. The on/off control uses -V_in(pin 1), on the primary

side of the converter, as its ground reference. All

voltages specified are with respect to -V_in.

Figure 3-2

2. The on/off control internal circuitry is a high

impedance 10µA current source. The open-circuit

voltage may be as high as 8.3Vdc.

Vout (2V/Div)

Iin (0.2A/Div)

3. The PT4500/20 series incorporates an “Under-Voltage

Lockout” (UVLO) function. The UVLO prevents

operation of the converter when there is sufficient input

voltage to support a regulated output. Below the UVLO

threshold voltage, there is no output from the module

and the Remote On/Off control is inoperative.

4. The Remote On/Off input of the PT4500/20 series

must be controlled with a low-leakage (<100nA) open-

drain MOSFET. Do not use a pull-up resistor.

Q1 Vgs (10V/Div)

5. When the converter output is disabled, the current

drawn from the input supply is typically reduced to

8mA (16mA maximum).

HORIZ. SCALE: 5ms/Div

6. Keep the on/off transition to less than 1ms. This

prevents erratic operation of the ISR, whereby the

output voltage may drift un-regulated between 0V

and the rated output during power-up.

For technical support and more information, see inside back cover or visit www.ti.com

PACKAGE OPTION ADDENDUM

www.ti.com

13-Oct-2005

PACKAGING INFORMATION

Orderable Device

PT4521A

PT4521C

PT4522A

PT4522C

PT4522N

PT4523A

PT4523C

PT4523N

PT4524A

PT4524C

PT4524N

PT4529A

PT4529C

PT4529N

Status ⁽¹⁾

ACTIVE

Package Package

Pins Package Eco Plan ⁽²⁾Lead/Ball Finish MSL Peak Temp ⁽³⁾

Qty

Type

Drawing

SIP MOD

ULE

ELK

12

10

TBD

Call TI

Level-1-215C-UNLIM

Level-3-215C-168HRS

Level-1-215C-UNLIM

Level-3-215C-168HRS

Level-1-215C-UNLIM

Level-3-215C-168HRS

Level-1-215C-UNLIM

Level-3-215C-168HRS

Level-1-215C-UNLIM

Level-3-215C-168HRS

Level-1-215C-UNLIM

SIP MOD

ULE

ELL

ELK

ELL

ELJ

ELK

ELL

ELJ

ELK

ELL

ELJ

ELK

ELL

ELJ

SIP MOD

ULE

SIP MOD

ULE

SIP MOD

ULE

SIP MOD

ULE

SIP MOD

ULE

SIP MOD

ULE

SIP MOD

ULE

SIP MOD

ULE

SIP MOD

ULE

SIP MOD

ULE

SIP MOD

ULE

SIP MOD

ULE

⁽¹⁾The marketing status values are defined as follows:

ACTIVE: Product device recommended for new designs.

LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.

NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in

a new design.

PREVIEW: Device has been announced but is not in production. Samples may or may not be available.

OBSOLETE: TI has discontinued the production of the device.

(2)

Eco Plan

-

The planned eco-friendly classification: Pb-Free (RoHS) or Green (RoHS

&

no Sb/Br)

-

please check

http://www.ti.com/productcontent for the latest availability information and additional product content details.

TBD: The Pb-Free/Green conversion plan has not been defined.

Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements

for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered

at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.

Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame

retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material)

(3)

MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder

temperature.

Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is

provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the

accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take

reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on

Addendum-Page 1

PACKAGE OPTION ADDENDUM

www.ti.com

13-Oct-2005

incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited

information may not be available for release.

In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI

to Customer on an annual basis.

Addendum-Page 2

IMPORTANT NOTICE

Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications,

enhancements, improvements, and other changes to its products and services at any time and to discontinue

any product or service without notice. Customers should obtain the latest relevant information before placing

orders and should verify that such information is current and complete. All products are sold subject to TI’s terms

and conditions of sale supplied at the time of order acknowledgment.

TI warrants performance of its hardware products to the specifications applicable at the time of sale in

accordance with TI’s standard warranty. Testing and other quality control techniques are used to the extent TI

deems necessary to support this warranty. Except where mandated by government requirements, testing of all

parameters of each product is not necessarily performed.

TI assumes no liability for applications assistance or customer product design. Customers are responsible for

their products and applications using TI components. To minimize the risks associated with customer products

and applications, customers should provide adequate design and operating safeguards.

TI does not warrant or represent that any license, either express or implied, is granted under any TI patent right,

copyright, mask work right, or other TI intellectual property right relating to any combination, machine, or process

in which TI products or services are used. Information published by TI regarding third-party products or services

does not constitute a license from TI to use such products or services or a warranty or endorsement thereof.

Use of such information may require a license from a third party under the patents or other intellectual property

of the third party, or a license from TI under the patents or other intellectual property of TI.

Reproduction of information in TI data books or data sheets is permissible only if reproduction is without

alteration and is accompanied by all associated warranties, conditions, limitations, and notices. Reproduction

of this information with alteration is an unfair and deceptive business practice. TI is not responsible or liable for

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Resale of TI products or services with statements different from or beyond the parameters stated by TI for that

product or service voids all express and any implied warranties for the associated TI product or service and

is an unfair and deceptive business practice. TI is not responsible or liable for any such statements.

Following are URLs where you can obtain information on other Texas Instruments products and application

solutions:

Products

Applications

Audio

Amplifiers

amplifier.ti.com

www.ti.com/audio

Data Converters

dataconverter.ti.com

Automotive

www.ti.com/automotive

DSP

dsp.ti.com

Broadband

Digital Control

Military

www.ti.com/broadband

www.ti.com/digitalcontrol

www.ti.com/military

Interface

Logic

interface.ti.com

logic.ti.com

Power Mgmt

Microcontrollers

power.ti.com

Optical Networking

Security

www.ti.com/opticalnetwork

www.ti.com/security

www.ti.com/telephony

www.ti.com/video

microcontroller.ti.com

Telephony

Video & Imaging

Wireless

www.ti.com/wireless

Mailing Address:

Texas Instruments

Post Office Box 655303 Dallas, Texas 75265


型号：	PT4520
厂家：	TEXAS INSTRUMENTS
描述：	20-W 48-V Input Isolated DC/DC Converter 20 -W 48 V输入隔离DC / DC转换器转换器
文件：	总10页 (文件大小：213K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

PT4520 [TI]

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