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UCC1807J-3 Datasheet(PDF) 1 Page - Texas Instruments

Part # UCC1807J-3
Description  Programmable Maximum Duty Cycle PWM Controller
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
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UCC1807J-3 Datasheet(HTML) 1 Page - Texas Instruments

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1
UCC1807-1/-2/-3
UCC2807-1/-2/-3
UCC3807-1/-2/-3
DESCRIPTION
The UCC3807 family of high speed, low power integrated circuits contains
all of the control and drive circuitry required for off-line and DC-to-DC fixed
frequency current mode switching power supplies with minimal external
parts count.
These devices are similar to the UCC3800 family, but with the added fea-
ture of a user programmable maximum duty cycle. Oscillator frequency and
maximum duty cycle are programmed with two resistors and a capacitor.
The UCC3807 family also features internal full cycle soft start and internal
leading edge blanking of the current sense input.
The UCC3807 family offers a variety of package options, temperature
range options, and choice of critical voltage levels. The family has UVLO
thresholds and hysteresis levels for off-line and battery powered systems.
Thresholds are shown in the table below.
Programmable Maximum Duty Cycle PWM Controller
FEATURES
User Programmable Maximum PWM
Duty Cycle
100
m A Startup Current
Operation to 1MHz
Internal Full Cycle Soft Start
Internal Leading Edge Blanking of
Current Sense Signal
1A Totem Pole Output
SLUS163 - JUNE 1997
BLOCK DIAGRAM
UDG-95001-1
Part Number
Turn-on Threshold
Turn-off Threshold
Packages
UCCx807-1
7.2V
6.9V
J
UCCx807-2
12.5V
8.3V
N, D
UCCx807-3
4.3V
4.1V
N, D, PW
application
INFO
available


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