NCP1052 データシートの表示（PDF） - ON Semiconductor

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NCP1052

Monolithic High Voltage Gated Oscillator Power Switching Regulator

ON Semiconductor 

NCP1050, NCP1051, NCP1052, NCP1053, NCP1054, NCP1055

AC Line

Input

VCC

+

1

Control Input 2

+

Snubber

Power Switch Circuit Output 5

Startup & VCC

Regulator Circuit

Fault Detector

Oscillator &

Gating Logic

Power

Switch

Circuit

+

+

Converter

DC Output

−

Ground 3, 7−8

Figure 1. Typical Application

Pin Function Description

Pin

Pin

(SOT−223) (PDIP−8)

Function

1

1

VCC

2

2

Control Input

4

3, 7, 8

Ground

−

4

No Connection

3

5

Power Switch

Drain

Description

This is the positive supply voltage input. During startup, power is supplied to this input

from Pin 5. When VCC reaches VCC(on), the Startup Circuit turns off and the output is

allowed to begin switching with 1.0 V hysteresis on the VCC pin. The capacitance con-

nected to this pin programs fault timing and frequency modulation rate.

The Power Switch Circuit is turned off when a current greater than approximately 50 mA

is drawn out of or applied to this pin. A 10 V clamp is built onto the chip to protect the

device from ESD damage or overvoltage conditions.

This pin is the control circuit and Power Switch Circuit ground. It is part of the integrated

circuit lead frame.

This pin is designed to directly drive the converter transformer primary, and internally

connects to Power Switch and Startup Circuit.

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