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LM25116 Datasheet(PDF) 11 Page - Texas Instruments

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No. de pieza LM25116
Descripción Electrónicos  Wide Range Synchronous Buck Controller
Download  36 Pages
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Fabricante Electrónico  TI [Texas Instruments]
Página de inicio  http://www.ti.com
Logo TI - Texas Instruments

LM25116 Datasheet(HTML) 11 Page - Texas Instruments

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background image
FB
VIN
VCC
REGULATOR
DRIVER
HB
ADAPTIVE
TIMER
EN
UVLO
UVLO
ERROR
AMP
DIS
COMP
CLK
S
R
Q
Q
OSCILLATOR
AGND
CLK
CSG
RAMP GENERATOR
+
SLEEP
MODE
SHUTDOWN
PWM
CURRENT
LIMIT
RAMP
SS
VIN
10 x RS V/A
5 PA
1V
10 PA
CS
DRIVER
PGND
LO
VOUT
HO
SW
1
2
3
4
5
14
6
15
10
13
12
20
19
18
+
-
4.5V
17
HICCUP FAULT TIMER
256 CLOCK CYCLES
UVLO
LOGIC
STANDBY
UVLO
7
8
9
16
VCCX
RT
A =10
VCC
DEMB
11
TRACK
SAMPLE
and
HOLD
CLK
DIODE
EMULATION
CONTROL
SS
SW
THERMAL
SHUTDOWN
3V
VCCX
EN
SYNC
1.215 V
CCOMP
RCOMP
CHF
1
0.5V
RS
CSNUB
VOUT
R SNUB
COUT
Q2
Q1
L1
RFB1
RFB2
IR
D1
C VCC
CVCCX
VIN
CHB
RT/SYNC
CRAMP
CSYNC
1.215V
7. 4 V
LM25116
REN
RUV2
RUV1
CIN
CFT
CSS
VIN
D2
IR = 5 PA
( VIN - VOUT ) + 25 PA
V x
/
.6V
6V - 42V
LM25116
www.ti.com
SNVS509D – APRIL 2007 – REVISED FEBRUARY 2013
BLOCK DIAGRAM AND TYPICAL APPLICATION CIRCUIT
Figure 26. Typical Application Circuit
DETAILED OPERATING DESCRIPTION
The LM25116 high voltage switching regulator features all of the functions necessary to implement an efficient
high voltage buck regulator using a minimum of external components. This easy to use regulator integrates high-
side and low-side MOSFET drivers capable of supplying peak currents of 2 Amps. The regulator control method
is based on current mode control utilizing an emulated current ramp. Emulated peak current mode control
provides inherent line feed-forward, cycle by cycle current limiting and ease of loop compensation. The use of an
emulated control ramp reduces noise sensitivity of the pulse-width modulation circuit, allowing reliable processing
of the very small duty cycles necessary in high input voltage applications. The operating frequency is user
programmable from 50 kHz to 1 MHz. An oscillator/synchronization pin allows the operating frequency to be set
by a single resistor or synchronized to an external clock. Fault protection features include current limiting, thermal
shutdown and remote shutdown capability. An under-voltage lockout input allows regulator shutdown when the
input voltage is below a user selected threshold, and an enable function will put the regulator into an extremely
low current shutdown via the enable input. The HTSSOP-20 package features an exposed pad to aid in thermal
dissipation.
Copyright © 2007–2013, Texas Instruments Incorporated
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