LT3752 datasheet(31/52 Pages) AD

Part #	LT3752

Description	Active Clamp Synchronous Forward Controllers with Internal Housekeeping Controller

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LT3752/LT3752-1

Rev. C

For more information www.analog.com

20µs/DIV

IMAG

1A/DIV

SWP

50V/DIV

3752 F14

APPLICATIONS INFORMATION

system input (Figure 17). In an active clamp reset topol-

ogy, volt-second balance requires:

VIN • D = (SWP – VIN) • (1 – D)

where:

VIN = Transformer input supply

D = (VOUT/VIN) • N = switch M1 duty cycle

VOUT = Output voltage (including the voltage drop

contribution of M4 catch diode during M1 off)

N = Transformer turns ratio = NP/NS

SWP = M1 drain voltage

DUTY CYCLE (%)

1.6

1.5

1.4

1.3

1.2

1.1

1.0

0.9

3752 F15

LO SIDE ACTIVE CLAMP TOPOLOGY

Figure 15. LO Side VCCL vs Duty Cycle

(Normalized to 50% Duty Cycle)

Figure 14. Active Clamp Reset: Magnetizing Current and M1 Drain Voltage

Figure 13. LO Side Active Clamp Topology

CCL

LLEAK

LMAG

FSW

CSW

• •

SWP

OUT

VIN

–VIN

VOUT

–VOUT

AOUT

LT3752

LTXXXX

3752 F13

LT3752 Datasheet(PDF) 31 Page - Analog Devices

LT3752 Datasheet(HTML) 31 Page - Analog Devices

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