SG1842L 查看數據表（PDF） - Microsemi Corporation

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SG1842L

Current Mode PWM Controller

Microsemi Corporation 

Typical Application Circuits

Typical Application Circuits

Pin numbers referenced are for 8-pin package and pin numbers in parenthesis are for 14-pin package.

VCC VIN

7 (12)

7 (11)

6 (10)

SG1842/43

5 (8)

3 (5)

Q1

IPK

R

C

RS

IPK(MAX)

=

1.0V

RS

Figure 17 · Current Sense Spike Suppression

The RC low-pass filter eliminates the leading edge current spike caused by parasitic of Power MOSFET.

VCC

VIN

7 (12)

7 (11)

R1

Q1

SG1842/43

6 (10)

5 (8)

RS

3 (5)

Figure 18 · MOSFET Parasitic Oscillations

A resistor (R1) in series with the MOSFET gate reduce overshoot and ringing caused by the MOSFET input

capacitance and any inductance in series with the gate drive. (Note: It is very important to have a low

inductance ground path to insure correct operation of the I.C. This can be done by making the ground paths

as short and as wide as possible.)

13

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