CS5651 datasheet(7/8 Pages) CHERRY

부품명	CS5651

상세설명	High Performance Dual Channel Current Mode Controller with ENABLE

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제조업체	CHERRY [Cherry Semiconductor Corporation]

홈페이지	http://www.cherrycorp.com/

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7

ter capacitor. Ceramic bypass capacitors (0.1µF) connected

directly to VCC and VREF may be required to improve noise

filtering. This provides a low impedance path for filtering

the high frequency noise. All high current loops should be

kept as short as possible using heavy copper runs. The

error amp compensation circuitry and the converter out-

put voltage-divider should be located close to the IC and

as far as possible from the power switch and other noise

generating components.

Operating Description: continued

SYNC

Capacitor CT

Latch 1

“Set” Input

COMP1

Sense1

VOUT1

Latch 1

“Reset” Input

ENABLE2

Latch 2

“Set” Input

COMP2

Sense2

Latch 2

“Reset” Input

VOUT2

0V

Timing Diagram

+

-

+

-

+

-

+

-

+

-

+

-

RT

CT

VFB

1

Reference

Regulator

VREF

UVLO

3.4V

14V

2.5V

R

20kΩ

VREF

Sync

1.0VREF

2R

1.0V

250µA

R

1.0mA

2R

Error

Amp 2

COMP1

ENABLE2

VFB

2

COMP2

Gnd

Pwr Gnd

R

1.0V

Current Sense

Comparator 2

Current Sense

Comparator 1

R

S

Q

R

S

R

PWM

Latch 2

PWM

Latch 1

VCC

VIN

VOUT

1

VOUT

2

Sense1

Q1

Q2

RSense1

Sense2

RSense2

-

+

-

Error

Amp 1

VOUT

1

VOUT

2

COUT

2

COUT

1

5.0V

Q

Oscillator

Internal

Bias

CF1 +

L1

D1

L2

D2

+

CF2

RFB

1

RFB

2

RFB

3

RFB

4

VOUT

2

VOUT

1

Dual Boost Regulator

VCC

UVLO

+

Typical Application Diagram

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