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Linear Technology Electronic Components Datasheet

LT1952 Datasheet

Single Switch Synchronous Forward Controller

No Preview Available !

FEATURES
n Synchronous Rectifier Control for High Efficiency
n Programmable Volt-Second Clamp
n Output Power Levels from 25W to 500W
n Low Current Start-Up
(LT1952: 460µA; VIN On/Off = 14.25V/8.75V)
(LT1952-1: 400µA; VIN On/Off = 7.75V/6.5V)
n True PWM Soft-Start
n Low Stress Short-Circuit Protection
n Precision 107mV Current Limit Threshold
n Adjustable Delay for Synchronous Timing
n Accurate Shutdown Threshold with Programmable
Hysteresis
n Programmable Slope Compensation
n Programmable Leading Edge Blanking
n Programmable Frequency (100kHz to 500kHz)
n Synchronizable to an External Clock up to 1.5 • fOSC
n Internal 1.23V Reference
n 2.5V External Reference
n Current Mode Control
n Small 16-Pin SSOP Package
APPLICATIONS
n Telecommunications Power Supplies
n Industrial and Distributed Power
n Isolated and Non Isolated DC/DC Converters
LT1952/LT1952-1
Single Switch Synchronous
Forward Controller
DESCRIPTION
The LT®1952/LT1952-1 are current mode PWM controllers
optimized to control the forward converter topology, using
one primary MOSFET. The LT1952/LT1952-1 provide
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, transformer and rectifier utilization. The devices
include soft-start for controlled exit from shutdown and
undervoltage lockout. A precision 107mV current limit
threshold, independent of duty cycle, combines with soft-
start to provide hiccup short-circuit protection. The LT1952
is optimized for micropower bootstrap start-up from high
input voltages. The LT1952-1 allows start-up from lower
input voltages. Programmable slope compensation and
leading edge blanking allow optimization of loop bandwidth
with a wide range of inductors and MOSFETs. Each device
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/LT1952-1
are available in a small 16-pin SSOP package.
L, LT, LTC and LTM are registered trademarks and ThinSOT is a trademark of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
36V to 72V Input, 12V at 20A Semi-Regulated Bus Converter
SUPPLY FROM BIAS
WINDING OF T1
40k VIN
T1
PA0905
16V 10µF
VREF
VIN
52.3k
COMP
VIN
340k
SS_MAXDC
OUT
LT1952/ OC
LT1952-1
ISENSE
Si7450
0.005Ω
Si7370
×2
100k
SD_VSEC
LTC3900
13k FB
SYNC
SOUT
T2 FG CG
SYNC
L1
PA1494.242
PH4840
×2
VOUT
12V
20A
47µF
16V
X5R
×2
GND
ROSC
220pF
560Ω
0.1µF 0.1µF
PGND BLANK DELAY
40k 40k
178k
1952 TA01
12V Bus Converter
VOUT vs VIN
16
14
12
10
8
36 42 48 54 60 66 72
VIN (V)
1952 TA01b
19521fe
1


Linear Technology Electronic Components Datasheet

LT1952 Datasheet

Single Switch Synchronous Forward Controller

No Preview Available !

LT1952/LT1952-1
ABSOLUTE MAXIMUM RATINGS
(Note 1)
VIN (Note 8)................................................ –0.3V to 25V
SYNC, SS_MAXDC, SD_VSEC, ISENSE, OC.....– 0.3V to 6V
COMP, BLANK, DELAY................................ –0.3V to 3.5V
FB .................................................................– 0.3V to 3V
ROSC...................................................................... –50µA
VREF .....................................................................–10mA
Operating Junction Temperature Range (Notes 2, 5)
E-, I-Grades........................................–40°C to 125°C
MP-Grade........................................... –55°C to 125°C
Storage Temperature Range....................–65°C to 150°C
Lead Temperature (Soldering, 10 sec)................... 300°C
PIN CONFIGURATION
COMP
FB
ROSC
SYNC
SS_MAXDC
VREF
SD_VSEC
GND
1
2
3
4
5
6
7
8
TOP VIEW
16 SOUT
15 VIN
14 OUT
13 PGND
12 DELAY
11 OC
10 ISENSE
9 BLANK
GN PACKAGE
16-LEAD PLASTIC SSOP
TJMAX = 125°C, qJA = 110°C/W, qJC = 40°C/W
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LT1952EGN#PBF
LT1952EGN#TRPBF
1952
16-Lead Plastic SSOP
LT1952IGN#PBF
LT1952IGN#TRPBF
1952I
16-Lead Plastic SSOP
LT1952MPGN#PBF
LT1952MPGN#TRPBF 1952
16-Lead Plastic SSOP
LT1952EGN-1#PBF
LT1952EGN-1#TRPBF 19521
16-Lead Plastic SSOP
LT1952IGN-1#PBF
LT1952IGN-1#TRPBF
1952I1
16-Lead Plastic SSOP
LT1952MPGN-1#PBF
LT1952MPGN-1#TRPBF 19521
16-Lead Plastic SSOP
LEAD BASED FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LT1952EGN
LT1952EGN#TR
1952
16-Lead Plastic SSOP
LT1952IGN
LT1952IGN#TR
1952I
16-Lead Plastic SSOP
LT1952MPGN
LT1952MPGN#TR
1952
16-Lead Plastic SSOP
LT1952EGN-1
LT1952EGN-1#TR
19521
16-Lead Plastic SSOP
LT1952IGN-1
LT1952IGN-1#TR
1952I1
16-Lead Plastic SSOP
LT1952MPGN-1
LT1952MPGN-1#TR
19521
16-Lead Plastic SSOP
Consult LTC Marketing for parts specified with wider operating temperature ranges.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–55°C to 125°C
–40°C to 125°C
–40°C to 125°C
–55°C to 125°C
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–55°C to 125°C
–40°C to 125°C
–40°C to 125°C
–55°C to 125°C
19521fe
2


Part Number LT1952
Description Single Switch Synchronous Forward Controller
Maker Linear Technology
PDF Download

LT1952 Datasheet PDF






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