SC2443EVB(2007) Просмотр технического описания (PDF) - Semtech Corporation

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производитель

SC2443EVB
(Rev.:2007)

Dual-Phase Single or Two Output Synchronous Step-Down Controller

Semtech Corporation 

SC2443

Typical Application Circuit Performance

Circuit Conditions : Single output current share configuration as shown in page 15

Soft Start

Releasing SS/EN pin from GND

Releasing SS/EN pin from GND

COMP1

1V/DIV

EN1/SS1

2V/DIV

VIN

2V/DIV

VOUT

1V/DIV

10ms/DIV

Shuting down _ VIN ramp down

VIN

5V/DIV

COMP1

1V/DIV

EN1/SS1

2V/DIV

VOUT

1V/DIV

10ms/DIV

Pulling SS/EN pin to GND

VIN

5V/DIV

EN1/SS1

2V/DIV

GDL1

5V/DIV

VOUT

1V/DIV

10ms/DIV

Gate Wavefroms

VIN

2V/DIV

EN1/SS1

2V/DIV

GDL1

10V/DIV

VOUT

1V/DIV

1ms/DIV

Output Ripple _ IOUT = 40A

VIN

5V/DIV

EN1/SS1

2V/DIV

GDL1

10V/DIV

VOUT

1V/DIV

400us/DIV

Transient Response _ 10A ~ 30A

GDH1

GDL1

10V/DIV

GDH2

GDL2

10V/DIV

1us/DIV

OCP Trip _ IOUT = 56A

GDH1

GDH2

10V/DIV

VOUT

20mV/DIV

1us/DIV

OCP Recovery to 30A loading

VOUT

50mV/DIV

SS1/EN1

2V/DIV

GDH1

20V/DIV

GDL1

10V/DIV

VOUT

0.5V/DIV

20ms/DIV

SS1/EN1

2V/DIV

GDH1

20V/DIV

GDL1

10V/DIV

200us/DIV

VOUT

0.5V/DIV

400us/DIV

EFF (%)

90

80

70

60

50

40

30

1

Efficiency (12VIN to 1VOUT)

5

10

15

20 25

30

35

40 IOUT(A)



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