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5962-8680603VFA Datasheet(PDF) 9 Page - Texas Instruments

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Part # 5962-8680603VFA
Description  Current-Mode PWM Controller
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

5962-8680603VFA Datasheet(HTML) 9 Page - Texas Instruments

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15
10
9
8
OSC
3
4
X3
+
5
6
E/A
7
COMP
E/A–
E/A+
C/S+
C/S-
CT
RT
SYNC
VIN
5.1 V
REFERENCE
REGULATOR
UVLO
LOCKOUT
2
VREF
13
11
VC
A OUT
14
12
B OUT
GND
Q
Q
T
S
S
R
Q
1
16
6 k
0.5 mA
350 mV
0.5 V
F/F
C/L SS
SHUTDOWN
Output Stage
COMP
UC1846-SP
www.ti.com
SLUS871C – JANUARY 2009 – REVISED OCTOBER 2015
7 Detailed Description
7.1 Overview
The UC1846-SP control devices provide all of the necessary features to implement fixed frequency, current
mode control schemes while maintaining a minimum external parts count. The superior performance of this
technique can be measured in improved line regulation, enhanced load response characteristics, and a simpler,
easier-to-design control loop. Topological advantages include inherent pulse-by-pulse current limiting capability,
automatic symmetry correction for push-pull converters, and the ability to parallel “power modules" while
maintaining equal current sharing.
7.2 Functional Block Diagram
NOTE: Pin numbers shown are for the J package.
7.3 Feature Description
UC1846-SP is a current mode controller, used to support various topologies such as forward, flyback, half-
bridge, full bridge, push-pull configurations.
Current mode control is a two-loop system. The switching power supply inductor is hidden within the inner
current control loop. This simplifies the design of the outer voltage control loop and improves power supply
performance in many ways, including better dynamics. The objective of this inner loop is to control the state-
space averaged inductor current, but in practice the instantaneous peak inductor current is the basis for control
(switch current - equal to inductor current during the on time - is often sensed). If the inductor ripple current is
small, peak inductor current control is nearly equivalent to average inductor current control.
Copyright © 2009–2015, Texas Instruments Incorporated
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Product Folder Links: UC1846-SP


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