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LT1952IGN Datasheet

  • LT1952IGN

  • Single Switch Synchronous Forward Controller

  • 24頁

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LT1952
Single Switch Synchronous
Forward Controller
FEATURES
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DESCRIPTIO
Synchronous Rectifier Control for High Efficiency
Programmable Volt-Second Clamp
Output Power Levels from 25W to 500W
Low Current Start-Up
True PWM Soft-Start
Low Stress Short Circuit Protection
Precision 100mV Current Limit Threshold
Adjustable Delay for Synchronous Timing
Accurate Shutdown Threshold with Programmable
Hysteresis
Programmable Slope Compensation
Programmable Leading Edge Blanking
Programmable Frequency (100kHz to 500kHz)
Synchronizable to an External Clock up to 1.5 鈥?f
OSC
Internal 1.23V Reference
2.5V External Reference
Current Mode Control
Small 16-Pin SSOP Package
APPLICATIO S
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Telecommunications Power Supplies
Industrial and Distributed Power
Isolated and Non-Isolated DC/DC Converters
The LT
廬
1952 is a current mode PWM controller optimized
to control the forward converter topology, using one
primary MOSFET. The LT1952 provides synchronous
rectifier control, resulting in extremely high efficiency. A
programmable Volt-Second clamp provides a safeguard
for transformer reset that prevents saturation. This allows
a single MOSFET on the primary side to reliably run at
greater than 50% duty cycle for high MOSFET, trans-
former and rectifier utilization. The LT1952 includes
soft-start for controlled exit from shutdown, overcurrent
conditions and undervoltage lockout. A precision 100mV
current limit threshold, independent of duty cycle, com-
bines with soft-start to provide hiccup short circuit protec-
tion. Micropower start-up allows the LT1952 to be effi-
ciently started from high input voltages. Programmable
slope compensation and leading edge blanking allow
optimization of loop bandwidth with a wide range of
inductors and MOSFETs. The LT1952 can be programmed
over a 100kHz to 500kHz frequency range and the part can
be synchronized to an external clock. The error amplifier
is a true op amp, allowing a wide range of compensation
networks. The LT1952 is available in a small 16-pin SSOP
package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
SUPPLY FROM BIAS
WINDING OF T1
36V to 72V Input, 12V at 20A Semi-Regulated Bus Converter
40k
V
IN
T1
PA0905
L1
PA1494.242
V
OUT
12V
20A
47碌F
16V
X5R
脳2
V
OUT
(V)
16V
V
REF
52.3k
V
IN
LT1952
340k
100k
13k
SD_V
SEC
FB
COMP
SS_MAXDC
OUT
OC
I
SENSE
V
IN
10碌F
Si7450
Si7370
脳2
PH4840
脳2
0.005鈩?/div>
LTC3900
T2
FG
SYNC
220pF
560鈩?/div>
CG
SYNC
GND
0.1碌F
0.1碌F
40k
SOUT
R
OSC
PGND BLANK DELAY
40k
178k
1952 TA01
U
12V Bus Converter
V
OUT
vs V
IN
16
14
12
10
8
36
42
48
54
V
IN
(V)
60
66
72
1952 TA01b
U
U
1952f
1

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