LT1534C Datasheet

IC型號(hào)：
LT1534C
PDF描述：
Linear Technology [Ultralow Noise 2A Switching Regulators]
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LT1534/LT1534-1

TYPICAL APPLICATIO S

Ultralow Noise Regulator for a Thermo-Electric Cooler,

Maintaining Sensitive Electronics at Low Temperatures

50m鈩?/div>

12V

0.1碌F

C2 +

47碌F

16V

1000pF

C1 +

47碌F

16V

100碌H

1 TO 5

6 TO 10

10k

22碌H

22碌F

16V

0A TO 1.5A

THERMOELECTRIC

COOLER

22碌H

22碌F

16V

22nF

PGND

VIN

110k

RVSL

10k

2200pF

18k

GND

LT1534-1

COL

2N3904

RCSL

2N3904

5.1k

1.6k

24k

3.3k

D1: MOTOROLA MBR5320T3

L1: MIDCOM 38440

L2: COILCRAFT B07T

L3, L4: SUMIDA CD43-220

U2A, U2B: LT1490

INPUT VOLTAGE

4V TO 12V

4.7碌F

1300pF

16.9k

CSL

33nF

GND

1,8,

9,16

NFB

SHDN

SYNC

PGND

LT1534-1

VSL

NOTE 1

47碌F

MBR320

COL

L1A

20碌H

L1B

20碌H

4.99k

NOTE 1: 25nH TRACE INDUCTANCE

OR COILCRAFT B10T

L1: COILTRONICS CTX20-4

10鈩?/div>

鈥?/div>

U2A

0.01碌F

100鈩?/div>

0.1碌F

499k

25k

100k

10k

499k

U2B

鈥?/div>

10k

690k

5.6V

0.1碌F

3.3M

10k

NTC

1534 TA05

Ultralow Noise 5V to 鈥?V Cuk Converter

鈥?V

0.7A

4.7碌F

A Cuk converter is a natural topology for a low noise

converter. The Cuk converter is a dual of a buck boost

converter. C1 is the primary means of storing and trans-

ferring energy. Like a buck boost, the DC transfer function

is approximately V

OUT

= DC/(1 鈥?DC). The output

voltage, though negative, can be higher or lower in mag-

nitude from the input. The two inductors can be separate

however, by placing them on the same winding input and

output current ripple can be greatly reduced. The addi-

tional slew control provided by the LT1534 will reduce the

high frequency content even further.

1534 TA06

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