NCP1271 datasheet(17/19 Pages) ONSEMI

Part #	NCP1271

Description	Soft?뭆kip Mode Standby PWM Controller with Adjustable Skip Level and External Latch

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Manufacturer	ONSEMI [ON Semiconductor]

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NCP1271

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17

Figure 40. NCP1271 Operation Threshold

Fault operation when staying

in this region longer than 130 ms

PWM operation

Non−latched shutdown

3 V

V FB

0 V

V skip

Figure 41. Non−Latchoff Shutdown

1

2

3

4

8

6

5

NCP1271

OFF

opto

coupler

Output Drive

The output stage of the device is designed to directly

drive a power MOSFET. It is capable of up to +500 mA and

−800 mA peak drive currents and has a typical rise and fall

time of 30 ns and 20 ns with a 1.0 nF load. This allows the

NCP1271 to drive a high−current power MOSFET directly

for medium−high power application.

Noise Decoupling Capacitors

There are three pins in the NCP1271 that may need

external decoupling capacitors.

1. Skip/Latch Pin (Pin 1) – If the voltage on

this pin is above 8.0 V, then the circuit enters

latchoff. Hence, a decoupling capacitor on this

pin is essential for improved noise immunity.

Additionally, a resistor should always be placed

from this pin to GND to prevent noise from

causing the pin 1 level to exceed the latchoff

level.

2. Feedback Pin (Pin 2) – The FB pin is a high

impedance point and is very easily polluted in a

noisy environment. This could effect the circuit

operation.

3. VCC Pin (Pin 6) – The circuit maintains normal

operation when VCC is above VCC(off) (9.1 V

typical). But, if VCC drops below VCC(off) because

of switching noise, then the circuit can incorrectly

recognize it as a fault condition. Hence, it is

important to locate the VCC capacitor or an

additional decoupling capacitor as close as possible

to the device.

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