M62502FP Ver la hoja de datos (PDF) - MITSUBISHI ELECTRIC

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M62502FP

PWM IC for the synchronized deflection system control

MITSUBISHI ELECTRIC  

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M62502 application

C2

16

MITSUBISHI (Dig./Ana. INTERFACE)

M62502FP

PWM IC for the synchronized deflection system control

IN-

R2

VR1

C3

R1

C5

C4

D1

15

14 13 12

IN+

R3 Duty

R4

11

10

Vcc

R5

DOUT

9

VCC

VREF

Duty

cont

Vcc

UVLO

Wind

comp

Comp

GEN

AGC

GEN

AGC

Edge

detection

1

2

3

4

5

6

7

8

Cosc Cagc1

Ragc

Cagc2

PWM OUT

TIN

2fh

C1

C1,C2 ----------- These capacitors are for stabilization of Vcc and VREF.

VR1 ----------- It is decided considering a current capability of VREF. (The capability is about 5mA.)

Recommended value is around 10kΩ

C3,D1 ----------- They are for a soft start function. A time constant is decided considering VR1.

Cagc1,2 ----------- These capacitors are for stabilization of AGC circuit. A larger capacitor improves a

stability of the system, however a system response is degraded.

Recommended capacitor value is around 1µF.

Cosc

---------- This capacitor is for the saw-wave generation.

Recommended capacitor value is around 1000pF.

R1,R2,R3,R4

C4,C5

----- They are for the gain setting of the error Amp. R2 should be several kΩ to dozens of kΩ

to set a voltage gain 20dB to 40dB at f = 1kHz, 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 kΩ to several

hundreds kΩ.

Ragc ----------- This resistor is for the AGC setting of DOUT. Recommended value is 27kΩ.

R5

----------- It is a pull-up resister of DOUT output, because DOUT is configured by the open

collector circuit. Recommended value is several kΩ.

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