SG1842 查看數據表（PDF） - Microsemi Corporation

零件编号

产品描述 (功能)

生产厂家

SG1842

Current Mode PWM Controller

Microsemi Corporation 

Current Mode PWM Controller

4.7 k

1k

ERROR AMP

ADJUST

4.7k

2N 2222

100 k

5k

ISENSE

ADJUST

RT

SG1842/43

1 COMP

VREF 8

2 VFB

VCC 7

3 ISENSE

OUTPUT 6

4 RTCT

GROUND 5

A

0.1µF 0.1µF 1k

CT

VREF

VCC

OUTPUT

GROUND

Figure 26 · Open Loop Laboratory Fixture

High-peak currents associated with capacitive loads necessitate careful grounding techniques. Timing and

bypass capacitors should be connected to pin 5 in a single point ground.

The transistor and 5kΩ potentiometer are used to sample the oscillator waveform and apply an adjustable

ramp to pin 3.

18

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