LTC3706 datasheet(6/20 Pages) LINER

Part #	LTC3706

Description	Secondary-Side Synchronous Forward Controller with PolyPhase Capability

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Manufacturer	LINER [Linear Technology]

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LTC3706

6

3706fb

1.25

1.75

2.50

2.25

2.00

1.50

3706 G13

1.00

TEMPERATURE (°C)

–50

50

75

100

25

–25

0

125

VCC = 7V

LOAD CURRENT (A)

0

85

90

95

20

15

3706 G17

510

25

80

VIN = 36V

VIN = 72V

20μs/DIV

VIN = 48V

VOUT = 3.3V

LOAD STEP = 0A TO 20A

VOUT

100mV/DIV

IOUT

10A/DIV

3706 G18

Gate Driver On-Resistance

vs Temperature

Efﬁciency (Figure 5)

Load Step (Figure 5)

TYPICAL PERFORMANCE CHARACTERISTICS T

A = 25°C, unless otherwise noted.

VIN SUPPLY VOLTAGE (V)

0

600.0

600.5

601.0

20

25

15

3706 G11

599.5

510

30

599.0

4.40

4.50

4.65

4.60

4.55

4.45

3706 G16

4.35

4.30

4.25

TEMPERATURE (°C)

–50

50

75

100

25

–25

0

125

VIN RISING

VCC RISING

VCC VOLTAGE (V)

5

1.6

1.7

1.8

9

8

3706 G12

1.5

1.4

1.3

67

10

1.2

PULL-DOWN

PULL-UP

FB Voltage Line Regulation

Undervoltage Lockout

vs Temperature

Gate Driver On-Resistance vs VCC

RFS (kΩ)

50

400

500

600

150

175

125

3706 G09

300

200

100

75

100

200

0

3.995

4.010

4.005

4.000

3706 G10

3.990

TEMPERATURE (°C)

–50

50

75

100

25

–25

0

125

599.5

601.0

600.5

600.0

3706 G15

599.0

TEMPERATURE (°C)

–50

50

75

100

25

–25

0

125

Oscillator Frequency vs RFS

REGSD Shutdown Threshold

vs Temperature

FB Voltage vs Temperature

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