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LTC3900 Datasheet

  • LTC3900

  • Synchronous Rectifier Driver for Forward Converters

  • 12頁(yè)

  • LINER

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Final Electrical Specifications
LTC3900
Synchronous Rectifier
Driver for Forward Converters
November 2003
FEATURES
s
s
s
s
s
s
s
s
DESCRIPTIO
N-Channel Synchronous Rectifier MOSFET Driver
Programmable Timeout
Reverse Inductor Current Sense
Pulse Transformer Synchronization
Wide V
CC
supply range: 4.5V to 11V
15ns Rise/Fall Times at V
CC
= 5V, C
L
= 4700pF
Undervoltage Lockout
Small SO-8 Package
The LTC
廬
3900 is a secondary-side synchronous rectifier
driver designed to be used in isolated forward converter
power supplies. The chip drives N-channel rectifier
MOSFETs and accepts pulse sychronization from the
primary-side controller via a pulse transformer.
The LTC3900 incorporates a full range of protection for the
external MOSFETs. A programmable timeout function is
included that disables both drivers when the synchroniza-
tion signal is missing or incorrect. Additionally, the chip
senses the output inductor current through the drain-
source resistance of the catch MOSFET, shutting off the
MOSFET if the inductor current reverses. The LTC3900
also shuts off the drivers if the supply voltage is low.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S
s
s
s
s
s
48V Input Isolated DC/DC Converters
Isolated Telecom Power Supplies
Distributed Power Step-Down Converters
Industrial Control System Power Supplies
Automotive and Heavy Equipment
TYPICAL APPLICATIO
V
IN
36V TO 72V
BG
ISOLATION
BARRIER
D3
T1
Q1
Q3
LTC1693-2
Q4
R
CS2
R
CS1
CS
+
CG
CS
鈥?/div>
R
CS3
C
SG
FG
LTC3900
TIMER
V
CC
LTC1693-2
GATE
LT1950
FORWARD CONTROLLER
GND COMP
SG
T2
R
SYNC
SYNC GND
C
F
R1
270鈩?/div>
R2
LT1797
OC1
Figure 1. Simplified Isolated Forward Converter
3900i
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
鈥?/div>
+
U
L0
C
OUT
C
Z
R
Z
R
B
Q
REG
U
U
+
V
OUT
3.3V
D
Z
R
TMR
C
VCC
C
TMR
R
F
V
R
3900 F01
1

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