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LT1952EGN#PBF

Description
Current Mode PWM Controller 80kHz to 560kHz 16-Pin SSOP N Tube
File Size344KB,28 Pages
ManufacturerADI
Websitehttps://www.analog.com
Download Datasheet Parametric View All

LT1952EGN#PBF Overview

Current Mode PWM Controller 80kHz to 560kHz 16-Pin SSOP N Tube

LT1952EGN#PBF Parametric

Parameter NameAttribute value
EU restricts the use of certain hazardous substancesCompliant
ECCN (US)EAR99
Part StatusActive
HTS8542.39.00.01
TypeCurrent Mode PWM Controller
Control MethodCurrent
TopologyFlyback|Forward
Number of PWM Outputs1
Switching Frequency (kHz)80 to 560
Maximum Duty Cycle (%)90(Typ)
Rise Time (ns)50
Fall Time (ns)30
Minimum Operating Supply Voltage (V)8.75
Maximum Operating Supply Voltage (V)25
Maximum Supply Current (mA)5.2
Adjustable OutputNo
On/Off PinNo
Synchronous PinYes
Minimum Operating Temperature (°C)-40
Maximum Operating Temperature (°C)125
Supplier Temperature GradeExtended
PackagingTube
Pin Count16
Standard Package NameSOP
Supplier PackageSSOP N
MountingSurface Mount
Package Height1.5(Max)
Package Length4.98(Max)
Package Width3.99(Max)
PCB changed16
Lead ShapeGull-wing
FEATURES
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; V
IN
On/Off = 14.25V/8.75V)
(LT1952-1: 400µA; V
IN
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 • f
OSC
n
Internal 1.23V Reference
n
2.5V External Reference
n
Current Mode Control
n
Small 16-Pin SSOP Package
n
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.
APPLICATIONS
n
n
n
Telecommunications Power Supplies
Industrial and Distributed Power
Isolated and Non Isolated DC/DC Converters
TYPICAL APPLICATION
36V to 72V Input, 12V at 20A Semi-Regulated Bus Converter
SUPPLY FROM BIAS
WINDING OF T1
40k
V
IN
T1
PA0905
L1
PA1494.242
16V
V
REF
52.3k
V
IN
340k
100k
13k
COMP
SS_MAXDC
LT1952/
LT1952-1
SD_V
SEC
FB
SYNC
GND
0.1µF
0.1µF
SOUT
R
OSC
OUT
OC
I
SENSE
V
IN
10µF
V
OUT
12V
20A
47µF
16V
X5R
×2
V
OUT
(V)
12V Bus Converter
V
OUT
vs V
IN
16
Si7450
Si7370
×2
PH4840
×2
14
12
0.005
LTC3900
T2
220pF
560
FG
SYNC
CG
10
8
36
42
48
PGND BLANK DELAY
40k
40k
178k
1952 TA01
54
V
IN
(V)
60
66
72
1952 TA01b
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