LTC3705_15 datasheet(4/20 Pages) LINER

Part #	LTC3705

Description	2-Switch Forward Controller and Gate Driver

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Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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LTC3705

4

3705fb

Supply Current vs VCC

Boost Current vs Boost – TS

Voltage

UVLO Voltage Threshold vs

Temperature

UVLO Hysteresis Current vs

Temperature

Oscillator Frequency

fOSC vs RFSET

Oscillator Frequency vs

Temperature

Shunt Regulator Current ICC

vs VCC

Shunt Regulator Current vs

Temperature

VGDUV vs Temperature

TYPICAL PERFOR A CE CHARACTERISTICS

VCC (V)

0

1.0

1.5

15

3705 G01

0.5

0

10

5

2.0

TRICKLE CHARGER

LINEAR REGULATOR

VBOOST – VTS (V)

0

350

300

250

200

150

100

50

15

3705 G02

0

10

5

400

VTS = 0V

VTS = 80V

RFSET (kΩ)

0

300

200

100

400

300

200

100

3705 G03

0

800

700

400

500

600

SECONDARY-SIDE CONTROL

PRIMARY-SIDE CONTROL

VCC (V)

14.00

9

6

3

15.00

14.75

14.50

14.25

3705 G04

0

18

12

15

TEMPERATURE (

°C)

–60

1.240

1.235

1.230

1.225

100

3705 G09

1.220

40

60

80

0

–20

20

–40

1.245

VUVLOF

VUVLOR

TEMPERATURE (

°C)

–60

5.00

4.95

4.90

4.85

100

3705 G10

4.80

40

60

80

0

–20

20

–40

5.05

TEMPERATURE (

°C)

–60

202

201

200

199

100

3705 G11

197

198

40

60

80

0

–20

20

–40

203

PRIMARY-SIDE CONTROL

RFS(P) = 100kΩ

TEMPERATURE (

°C)

–60

100

3705 G12

15

16

17

18

19

40

60

80

0

–20

20

–40

25

24

23

22

21

20

TEMPERATURE (

°C)

–60

100

3705 G13

6

7

8

40

60

80

0

–20

20

–40

14

13

12

11

10

9

VCC RISING (TRICKLE CHARGER)

VCC RISING (LINEAR REGULATOR)

VCC FALLING (BOTH)

(TA = 25°C unless otherwise specified)

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