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LT1952IGN-1#TRPBF

Description
Switching Voltage Regulators Synchronous Version of the LT1950
CategoryPower/power management    The power supply circuit   
File Size351KB,28 Pages
ManufacturerADI
Websitehttps://www.analog.com
Environmental Compliance
Download Datasheet Parametric Compare View All

LT1952IGN-1#TRPBF Overview

Switching Voltage Regulators Synchronous Version of the LT1950

LT1952IGN-1#TRPBF Parametric

Parameter NameAttribute value
Brand NameAnalog Devices Inc
Is it lead-free?Contains lead
Is it Rohs certified?conform to
MakerADI
package instructionSSOP,
Contacts16
Manufacturer packaging code05-08-1641 (GN16)
Reach Compliance Codecompliant
Analog Integrated Circuits - Other TypesSWITCHING CONTROLLER
control modeCURRENT-MODE
Control TechnologyPULSE WIDTH MODULATION
Maximum input voltage25 V
Minimum input voltage6.82 V
Nominal input voltage15 V
JESD-30 codeR-PDSO-G16
JESD-609 codee3
length4.89 mm
Humidity sensitivity level1
Number of functions1
Number of terminals16
Maximum operating temperature125 °C
Minimum operating temperature-40 °C
Maximum output current1 A
Package body materialPLASTIC/EPOXY
encapsulated codeSSOP
Package shapeRECTANGULAR
Package formSMALL OUTLINE, SHRINK PITCH
Peak Reflow Temperature (Celsius)260
Certification statusNot Qualified
Maximum seat height1.75 mm
surface mountYES
Switch configurationSINGLE
Maximum switching frequency560 kHz
Temperature levelAUTOMOTIVE
Terminal surfaceMATTE TIN
Terminal formGULL WING
Terminal pitch0.635 mm
Terminal locationDUAL
Maximum time at peak reflow temperature30
width3.899 mm
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
19521fe
1

LT1952IGN-1#TRPBF Related Products

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Description Switching Voltage Regulators Synchronous Version of the LT1950 Switching Voltage Regulators LT1952 - Single Switch Synchronous Forward Controller Switching Voltage Regulators LT1952 - Single Switch Synchronous Forward Controller Switching Voltage Regulators Synchronous Version of the LT1950
Is it Rohs certified? conform to incompatible incompatible conform to
Maker ADI ADI ADI ADI
package instruction SSOP, SSOP, SSOP, SSOP,
Reach Compliance Code compliant not_compliant not_compliant compliant
Analog Integrated Circuits - Other Types SWITCHING CONTROLLER SWITCHING CONTROLLER SWITCHING CONTROLLER SWITCHING CONTROLLER
control mode CURRENT-MODE CURRENT-MODE CURRENT-MODE CURRENT-MODE
Control Technology PULSE WIDTH MODULATION PULSE WIDTH MODULATION PULSE WIDTH MODULATION PULSE WIDTH MODULATION
Maximum input voltage 25 V 25 V 25 V 25 V
Minimum input voltage 6.82 V 6.82 V 6.82 V 6.82 V
Nominal input voltage 15 V 15 V 15 V 15 V
JESD-30 code R-PDSO-G16 R-PDSO-G16 R-PDSO-G16 R-PDSO-G16
JESD-609 code e3 e0 e0 e3
length 4.89 mm 4.89 mm 4.89 mm 4.89 mm
Humidity sensitivity level 1 1 1 1
Number of functions 1 1 1 1
Number of terminals 16 16 16 16
Maximum operating temperature 125 °C 125 °C 125 °C 125 °C
Minimum operating temperature -40 °C - -40 °C -40 °C
Maximum output current 1 A 1 A 1 A 1 A
Package body material PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY
encapsulated code SSOP SSOP SSOP SSOP
Package shape RECTANGULAR RECTANGULAR RECTANGULAR RECTANGULAR
Package form SMALL OUTLINE, SHRINK PITCH SMALL OUTLINE, SHRINK PITCH SMALL OUTLINE, SHRINK PITCH SMALL OUTLINE, SHRINK PITCH
Peak Reflow Temperature (Celsius) 260 235 235 260
Certification status Not Qualified Not Qualified Not Qualified Not Qualified
Maximum seat height 1.75 mm 1.75 mm 1.75 mm 1.75 mm
surface mount YES YES YES YES
Switch configuration SINGLE SINGLE SINGLE SINGLE
Maximum switching frequency 560 kHz 560 kHz 560 kHz 560 kHz
Temperature level AUTOMOTIVE OTHER AUTOMOTIVE AUTOMOTIVE
Terminal surface MATTE TIN Tin/Lead (Sn/Pb) Tin/Lead (Sn/Pb) MATTE TIN
Terminal form GULL WING GULL WING GULL WING GULL WING
Terminal pitch 0.635 mm 0.635 mm 0.635 mm 0.635 mm
Terminal location DUAL DUAL DUAL DUAL
Maximum time at peak reflow temperature 30 20 20 30
width 3.899 mm 3.899 mm 3.899 mm 3.899 mm
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