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NCP1200AP60G

PWM Current-Mode Controller for Universal Off-Line Supplies Featuring Low Standby Power

ON Semiconductor 

300 M

200 M

100 M

0

NCP1200A

MAX PEAK

CURRENT

SKIP CYCLE

CURRENT LIMIT

315.40

882.70

1.450 M

2.017 M

2.585 M

Figure 19. The Skip Cycle Takes Place at Low Peak Currents which Guaranties Noise−Free

Operation

We recommend a pin 1 operation between 400 mV and

1.3 V that will fix the skip peak current level between 120

mV / RSENSE and 390 mV / RSENSE.

Non−Latching Shutdown

In some cases, it might be desirable to shut off the part

temporarily and authorize its restart once the default has

disappeared. This option can easily be accomplished

through a single NPN bipolar transistor wired between FB

and ground. By pulling FB below the Adj pin 1 level, the

output pulses are disabled as long as FB is pulled below

pin 1. As soon as FB is relaxed, the IC resumes its operation.

Figure 20 depicts the application example:

ON/OFF

1

8

2

7

3

6

Q1

4

5

Figure 20. Another Way of Shutting Down the IC without a Definitive Latchoff State

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