DPA426G 查看數據表（PDF） - Power Integrations, Inc

零件编号

产品描述 (功能)

生产厂家

DPA426G

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

Power Integrations, Inc 

Typical Uses of FREQUENCY (F) Pin

+

DPA422-426

+

DC

Input

Voltage

-

D

CONTROL

C

S

F

Figure 9. 400 kHz Frequency Operation.

DC

Input

Voltage

D

CONTROL

C

S

F

PI-2654-071700

-

Figure 10. 300 kHz Frequency Operation.

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

PI-2655-071700

+

DC

Input

Voltage

CL X S F D

D

L

CONTROL

C

CS D

-

S

XF

PI-2766-070901

Figure 11. Three Terminal Operation (LINE-SENSE and EXTERNAL CURRENT

LIMIT Features Disabled. FREQUENCY Pin can be tied to SOURCE or

CONTROL Pin).

+

DC

Input

Voltage

VUV = IUV x RLS + VL (IL = IUV)

VOV = IOV x RLS + VL (IL = IOV)

RLS

619 k

1%

D

L

CONTROL

C

For RLS = 619 k

VUV = 33.3 V

VOV = 86.0 V

-

S

PI-2767-091302

Figure 12. Line-Sensing for Undervoltage, Overvoltage and Line Feed-forward.

+

DC

Input

Voltage

6.2 V

576 k

1%

42.2 k

1%

VUV = RLS x IUV +

VL (IL = IUV)

RLS

For Values Shown

VUV = 33.3 V

D

L

CONTROL

C

-

S

PI-2852-091302

Figure 13. Line-Sensing for Undervoltage Only (Overvoltage Disabled).

+

DC

Input

Voltage

590 k

1%

RLS

30 k

1%

D

L

CONTROL

C

VOV = IOV x RLS +

VL (IL = IOV)

For Values Shown

VOV = 86.2 V

1N4148

-

S

PI-2853-091302

Figure 14. Line-Sensing for Overvoltage Only (Undervoltage Disabled).

Maximum Duty Cycle will be reduced at Low Line.

www.powerint.com

11

Rev. T 12/12

Share Link: