NCP1237 データシートの表示（PDF） - ON Semiconductor

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NCP1237

Fixed Frequency Current Mode Controller for Flyback Converters

ON Semiconductor 

NCP1237

DETAILED DESCRIPTION

High−Voltage Current Source (Dynamic Self−Supply)

with Built−in Brown−out Detection

The NCP1237 HV pin can be connected either to the

rectified bulk voltage, or to the ac line through a rectifier.

Startup

HV

VCC

Control

Istart

+

+−

VCC(on)

−

++

VCC(min)

TSD

IC Start

R

Q

S

−

++

blanking

tUVLO(blank)

VCC(off )

UVLO

−

++

VCC(reset)

Reset

Figure 4. HV Startup Current Source Functional Schematic

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