DPA422 View Datasheet(PDF) - Power Integrations, Inc

Part Name

Description

MFG CO.

DPA422

Highly Integrated DC-DC Converter ICs for Power over Ethernet & Telecom Applications

Power Integrations, Inc 

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DPA422-426

Typical Uses of LINE-SENSE (L) and EXTERNAL CURRENT LIMIT (X) Pins (cont.)

+

DC

Input

Voltage

-

DCMAX@36 V = 75%

DCMAX@72 V = 42%

RLS

619 k

1%

QR can be an optocoupler

D

L

output or can be replaced

by a manual switch.

CONTROL

C

For RIL = 12 k

S

X

ILIMIT = 64%

RIL

QR

ON/OFF

47 k

PI-2859-050602

Figure 21. Active-on Remote ON/OFF with LINE-SENSE and

EXTERNAL CURRENT LIMIT.

ON/OFF

DC

Input

Voltage

D

L

CONTROL

C

S

Figure 22. Active-off Remote ON/OFF with LINE-SENSE.

+

DC

Input

Voltage

-

For RLS = 619 k

RLS

619 K

1%

VUV = 33.3 V

VOV = 86.0 V

DCMAX@36 V = 75%

DCMAX@72 V = 42%

D

L

CONTROL

C

S

X

For RIL = 12 k

ILIMIT = 64%

RIL

See Figure 32 for other

12 k

resistor values (RIL)

to select different ILIMIT

values PI-2837-050602

Figure 23. Line-Sensing and Externally Set Current Limit.

+

DC

Input

Voltage

QR can be an optocoupler

output.

For timing requirements,

see Figure 6.

D

L

CONTROL

C

S

-

Figure 24. Synchronization.

QR

ON/OFF

47 kΩ

PI-3868-050602

www.powerint.com

13

Rev. T 12/12

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