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UC1842A-EP 数据表(PDF) 9 Page - Texas Instruments

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部件名 UC1842A-EP
功能描述  QML Class V, Current-Mode PWM Controller
Download  31 Pages
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制造商  TI1 [Texas Instruments]
网页  http://www.ti.com
标志 TI1 - Texas Instruments

UC1842A-EP 数据表(HTML) 9 Page - Texas Instruments

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7
5
4
2
1
3
8
7
6
5
V
CC
Gnd
R
T/CT
V
FB
Comp
C/S
V
REF
5.0 V
50 mA
V
C
Output
Pwr
Ground
PWM
Latch
5-V
REF
S/R
UVLO
34 V
2.5 V
Osc
Error
Amplifier
2R
R
1 V
Current
Sense
Comparator
Internal
Bias
V
Good
Logic
REF
S
R
UC1842A-SP, UC1843A-SP, UC1844A-SP
www.ti.com
SLUS872D – JANUARY 2009 – REVISED MAY 2015
9 Detailed Description
9.1 Overview
The UC184xA-SP control IC is a pin-for-pin compatible improved version of the UC184x family. Providing the
necessary features to control current-mode switched-mode power supplies, this device has the following
improved features. Startup current is specified to be less than 0.5 mA. Oscillator discharge is trimmed to 8.3 mA.
During UVLO, the output stage can sink at least 10 mA at less than 1.2 V for VCC over 5 V.
9.2 Functional Block Diagram
9.3 Feature Description
UC184xA is a current mode controller, used to support various topologies such as forward, flyback, Buck, Boost
and using an external interface circuit will also support half-bridge, full bridge, and push-pull configurations.
Figure 2 shows the two-loop current-mode control system in a typical buck regulator application. A clock signal
initiates power pulses at a fixed frequency. The termination of each pulse occurs when an analog of the inductor
current reaches a threshold established by the error signal. In this way, the error signal actually controls peak
inductor current. This contrasts with conventional schemes in which the error signal directly controls pulse width
without regard to inductor current.
Several performance advantages result from the use of current-mode control. First, an input voltage feed-forward
characteristic is achieved; that is, the control circuit instantaneously corrects for input voltage variations without
using up any of the error amplifier’s dynamic range. Therefore, line regulation is excellent and the error amplifier
can be dedicated to correcting for load variations exclusively.
Copyright © 2009–2015, Texas Instruments Incorporated
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Product Folder Links: UC1842A-SP UC1843A-SP UC1844A-SP


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