LTC3725 datasheet(4/20 Pages) LINER

Part #	LTC3725

Description	Single-Switch Forward Controller and Gate Driver

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Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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LTC3725

4

3725f

Supply Current vs VCC

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

Optoisolator Bias VFB/IN+ vs

IFB/IN+

VCC (V)

0

1.0

1.5

15

3725 G01

0.5

0

10

5

2.0

TRICKLE CHARGER

LINEAR REGULATOR

TEMPERATURE (

°C)

–60

1.240

1.235

1.230

1.225

100

3725 G02

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

3725 G03

4.80

40

60

80

0

–20

20

–40

5.05

RFSET (kΩ)

0

300

200

100

400

300

200

100

3725 G04

0

800

700

400

500

600

SECONDARY-SIDE CONTROL

PRIMARY-SIDE CONTROL

TEMPERATURE (

°C)

–60

202

201

200

199

100

3725 G05

197

198

40

60

80

0

–20

20

–40

203

PRIMARY-SIDE CONTROL

RFS(P) = 100kΩ

VCC (V)

14.00

9

6

3

15.00

14.75

14.50

14.25

3725 G06

0

18

12

15

TEMPERATURE (

°C)

–60

100

3725 G07

15

16

17

18

19

40

60

80

0

–20

20

–40

25

24

23

22

21

20

TEMPERATURE (

°C)

–60

100

3725 G08

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)

–IFB/IN+ (mA)

0

1.5

1.0

0.5

2.0

1.5

1.0

0.5

3725 G09

0

3.5

2.0

2.5

3.0

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