LT3959EUHE Просмотр технического описания (PDF) - Linear Technology

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LT3959EUHE

Wide Input Voltage Range Boost/SEPIC/Inverting Converter with 6A, 40V Switch

Linear Technology 

LT3959

Typical Applications

2.5V to 24V Input, 12V Output SEPIC Converter

VIN

2.5V TO 24V

4.7µF

L1A

50V

D1

CIN

22µF

50V

124k

×2

150k 121k

TIE TO SGND IF

NOT USED

VIN

EN/UVLO

SW

GND

PGOOD

SYNC

LT3959

DRIVE

RT

SS

FBX

VC SGND GNDK INTVCC

L1B

105k

27.4k

300kHz

7.5k

4.7µF 15.8k

0.1µF

22nF

COUT1

47µF

16V

X5R

×2

VOUT

12V

500mA AT VIN = 2.5V

1.5A AT VIN > 8v

L1A, L1B: COILTRONICS DRQ127-150

D1: VISHAY 6CWQ06FN

3959 TA03

Efficiency vs Output Current

100

VIN = 12V

95

90

85

80

75

70

65

60

0

200 400 600 800 1000

OUTPUT CURRENT (mA)

3759 TA03b

Load Step Response at VIN = 12V

Frequency Foldback Waveforms

When Output Short-Circuits

VOUT

500mV/DIV

(AC)

VOUT

10V/DIV

VSW

20V/DIV

IOUT

500mA/DIV

0.8A

IL1A+L1B

2.5A/DIV

0.2A

500µs/DIV

3959 TA03c

500µs/DIV

3959 TA03d

For more information www.linear.com/LT3959

3959fa

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