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UC2845AD8G4 Fiches technique(PDF) 9 Page - Texas Instruments

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No de pièce UC2845AD8G4
Description  Current-Mode PWM Controller
Download  45 Pages
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

UC2845AD8G4 Fiches technique(HTML) 9 Page - Texas Instruments

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S(max)
S
1 V
I
R
´
VREF
5 V
VC
OUTPUT
GND
PWM
Latch
Current
Sense
Comparator
1 V
R
2R
Error
Amp
ISENSE
COMP
FB
RT/CT
GND
VCC
34 V
2.5 V
UVLO
+
T
S
R
VREF
Good
Logic
Internal
Bias
5 V
REF
S/R
OSC
Copyright © 2016, Texas Instruments Incorporated
9
UC1842A, UC1843A, UC1844A, UC1845A
UC2842A, UC2843A, UC2844A, UC2845A
UC3842A, UC3843A, UC3844A, UC3845A
www.ti.com
SLUS224E – SEPTEMBER 1994 – REVISED JULY 2016
Product Folder Links: UC1842A UC1843A UC1844A UC1845A UC2842A UC2843A UC2844A UC2845A UC3842A
UC3843A UC3844A UC3845A
Submit Documentation Feedback
Copyright © 1994–2016, Texas Instruments Incorporated
8 Detailed Description
8.1 Overview
The UCx84xA family of fixed-frequency pulse-width-modulator (PWM) controllers are designed to operate at
switching frequencies of 500 kHz. These controllers are designed for peak current mode (PCM) and can be used
in isolated and non-isolated power supply designs. These controllers can drive FETs directly from the output,
which is capable of sourcing and sinking up to 1 A of gate driver current. These devices also have a built-in low-
impedance amplifier that can be used in non-isolated designs to control the power supply output voltage and
feedback loop.
8.2 Functional Block Diagram
8.3 Feature Description
8.3.1 Pulse-by-Pulse Current Limiting
Pulse-by-pulse limiting is inherent in the current mode control scheme. An upper limit on the peak current can be
established by simply clamping the error voltage. Accurate current limiting allows optimization of magnetic and
power semiconductor elements while ensuring reliable supply operation.
8.3.2 Current Sense Circuit
Peak current (IS) is determined by Equation 1:
(1)
A small RC filter may be required to suppress switch transients.


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