DPA424 datasheet(17/36 Pages) POWERINT

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DPA423-426

1/04

Table 4. Output Power Table for 24 VDC Minimum Input Voltage

(See Table 3 for Notes).

PRODUCT3

OUTPUT POWER TABLE

5 W

7 W

7.5 W

7 W 10 W 15 W

15.5 W

10 W 14 W 22 W 27 W

31 W

12 W 16.5 W 25 W 31 W 37 W

43 W

DPA423

DPA424

DPA425

DPA426

16-32 VDC RANGE (FORWARD)2

Total Device

Dissipation 0.5 W 1 W

2.5 W 4 W

6 W

Max

Power

Output1

PRODUCT3

OUTPUT POWER TABLE

8 W 11 W

11.5 W

11 W 16 W 23.5 W

25 W

16 W 22 W 35 W 43 W

47 W

18 W 25 W 39 W 48 W 58 W 65 W

DPA423

DPA424

DPA425

DPA426

24-48 VDC RANGE (FORWARD)2

Total Device

Dissipation 0.5 W 1 W

2.5 W

4 W

6 W

Max

Power

Output1

Table 3. Output Power Table for 16 VDC Minimum Input Voltage.

Notes: 1. Maximum output power is limited by device internal

current limit. 2. See text in this section for a complete description of

assumptions. 3. See Part Ordering Information.

resistors R8 and R9 and is fed to the low voltage 1.24 V

reference U3. Feedback compensation is provided by R6, R7

and C11 together with C4 and R4. Capacitor C10 provides a

soft-finish characteristic, preventing output overshoot during

start-up.

Key Application Considerations

DPA-Switch Design Considerations

Power Table

This section provides a description of the assumptions used to

generate the power tables (Tables 1 and 3 through 6) and

explains how to use the information provided by them.

All Power tables: Tables 1 and 3 through 6

•Maximum output power is limited by the device internal

current limit. This is the peak output power which could

become the continuous output power, provided adequate

heat sinking is used.

• Data assumes adequate heat sinking to keep the junction

temperature at or below 100

°C and worst case R

DS(ON) at

J = 100 °C.

• The use of P and G packages are recommended for device

dissipation equal to or less than 1.5 W only due to package

thermal limitation. For device dissipation above 1.5 W, use

R package.

Forward power tables: Tables 1 (upper half), 3 and 4

• Output power figures are based on forward topology using

Schottky diode rectification. Up to 5% higher output power

is possible using synchronous rectification.

• Dissipation data assumes a diode loss representing 6% of the

total output power and combined loss in magnetic components

representing 6% of the total output power. DPA-Switch

losses are based on a ratio between conduction and switching

losses of approximately 3:1. These assumptions are typical

for a single 5 V output forward converter design using

Schottky rectification and adequately designed magnetic

components.

Flyback power tables: Tables 1 (lower half), 5 and 6

• Output power and dissipation figures are based on a 5 V

output using Schottky diode rectification with an efficiency

of 85%. Values are generated by calculation based on

I2 • R

DS(ON) losses and characterization of switching losses,

correlated to bench measurement of each DPA-Switch device.

• Device dissipations above 1.5 W are possible using the

R package. However the forward converter topology is

recommended for such higher power designs.

The power tables provide two types of information. The first is

the expected device dissipation for a given output power. The

second is the maximum power output. Each table specifies the

input voltage range and assumes a single 5 V output using

Schottky diode rectification.

Table 5. Flyback Output Power Table for 16 VDC Minimum Input

Voltage (See Table 3 for Notes).

PRODUCT3

OUTPUT POWER TABLE

5 W

6 W

6.5 W

8.5 W 10 W

11 W

7 W

10 W

12 W

15 W

22 W

DPA423

DPA424

DPA425

16-32 VDC RANGE (FLYBACK)2

Total Device

Dissipation

0.5 W

0.75 W

1 W

1.5 W

Max

Power

Output1

For example, referring to Table 1, for 36-75 VDC input range,

DPA424 would typically dissipate 1 W in a 23 W forward

converter and has a maximum power capacity of 35 W. In the

same converter, DPA425 would dissipate 0.5 W. Selecting

DPA425 with associated reduced dissipation would increase

overall converter efficiency by approximately 2%.

Issues Affecting Dissipation:

1) Using synchronous rectification will tend to reduce device

dissipation.

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