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LM25037MTX Fiches technique(PDF) 9 Page - Texas Instruments

No de pièce LM25037MTX
Description  Dual-Mode PWM Controller With Alternating Outputs
Download  37 Pages
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

LM25037MTX Fiches technique(HTML) 9 Page - Texas Instruments

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background image
VIN
VCC
SS
OSCILLATOR
CLK
PWM
VCC/REF
UVLO
CS
RAMP
CLK + LEB
OUTA
DRIVER
OUTB
VCC
COMP
SS
UVLO
RES
CLK
8 PA
DRIVER
5V
Reference
REF
STANDBY
SHUTDOWN
SS
PWM
LOGIC
Standby
S
R
Q
AGND
PGND
+5V
Hiccup
RESTART DELAY
RT2
VCC
FB
ERROR
AMP
J
Q
Q
K
SET
CLR
SS Buffer
Shutdown
7.7V LDO
UVLO HYSTERESIS (22 PA)
RT1/SYNC
THERMAL LIMIT
( 165°C)
1V
Restart
Current
Source
Logic
18 PA
5k
+5V
+5V
+5V
1.25V
1.25V
0.45V
MODE
CONTROL
LOGIC
1 PA
100 PA
0.25V
SOFT-START
SOFT-STOP
100 PA
2.0V
LM25037, LM25037-Q1
www.ti.com
SNVS572E – JULY 2008 – REVISED JANUARY 2016
7 Detailed Description
7.1 Overview
The LM25037 PWM controller contains all the features necessary to implement double-ended power converter
topologies such as push-pull, half-bridge and full-bridge. The unique architecture allows the modulator to be
configured for either voltage-mode or current-mode control. The LM25037 provides two alternating gate driver
outputs to drive the primary side power MOSFETs with programmable forced dead-time. The LM25037 can be
configured to operate with bias voltages ranging from 5.5 V to 75 V. Additional features include line undervoltage
lockout, cycle-by-cycle current limit, voltage feed-forward compensation, and hiccup mode fault protection with
adjustable delays, soft-start, and a 2-MHz capable oscillator with synchronization capability, precision reference,
and thermal shutdown. These rich set of features simplify the design of double ended topologies. The functional
block diagram is show in the Functional Block Diagram section.
7.2 Functional Block Diagram
Copyright © 2008–2016, Texas Instruments Incorporated
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Product Folder Links: LM25037 LM25037-Q1


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