M62501FP datasheet(8/11 Pages) RENESAS

8 / 11 page

M62501P/FP

Rev.2.00 Jun 14, 2006 page 8 of 10

M62501 Application

C1, C2: Stabilization capacitors of VCC and VREF.

VR1:

It is decided considering a load capacity of VREF.

(A load capacity is approximately 5 mA.)

Recommended value is around 10 k

Ω.

C3, Dl: They are for the soft start function. A time constant is decided considering VR1.

CAGC: This capacitor is for stabilization of AGC. A larger capacitor improves a stability of the system, however

a system response is degraded.

Recommended value is around 1

µF.

COSC: This capacitor is for a saw wave generation. Recommended value is around 1000 pF.

R1, R2, R3, R4, C4, C5:

They are for a gain setting of the error Amp. R2 should be several k

Ω to dozens of kΩ to set a voltage gain

20 dB to 40 dB at f = 1 kHz, so that the feed back loop is stable.

When the voltage gain is too low, it causes jitter.

Recommended values of C4, C5 and R1 are ;

C4 = dozens of pF to several hundreds pF

C5 = several thousands pF to tens of thousands pF

R1 = dozens of k

Ω to several hundreds kΩ.

Note: Connect 7-pin and 8-pin terminal to GND when don't use under voltage protection. (UVP)

PWM OUT

TIN

COSC

CAGC

VR1

−

UVLO

VCC

AGC

GEN

Comp

VCC

VREF

P. OUT

OVP

UVP

−

VREF

Latch

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