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UCC28700-Q1 Datasheet(PDF) 3 Page - Texas Instruments

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Part # UCC28700-Q1
Description  Constant-Voltage, Constant-Current Controller With Primary-Side Regulation
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

UCC28700-Q1 Datasheet(HTML) 3 Page - Texas Instruments

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1
2
3
6
5
4
VDD
DRV
VS
GND
CS
CBC
UCC28700-Q1
www.ti.com
SLUSC61 – JANUARY 2015
5 Pin Configuration and Functions
UCC28700-Q1
SOT23-6 (DBV)
Top View
Pin Functions
PIN
UCC28700-Q1
I/O
DESCRIPTION
NAME
NO.
Cable Compensation (CBC) is a programming pin for compensation of cable voltage
CBC
1
I
drop. Cable compensation is programmed with a resistor to GND.
Current Sense (CS) input connects to a ground-referenced current-sense resistor in
series with the power switch. The resulting voltage is used to monitor and control the
CS
4
I
peak primary current. A series resistor can be added to this pin to compensate the peak
switch current levels as the AC-mains input varies.
Drive (DRV) is an output used to drive the gate of an external high voltage MOSFET
DRV
3
O
switching transistor.
The Ground (GND) pin is both the reference pin for the controller and the low-side return
for the drive output. Special care should be taken to return all AC decoupling capacitors
GND
5
—
as close as possible to this pin and avoid any common trace length with analog signal
return paths.
VDD is the bias supply input pin to the controller. A carefully-placed bypass capacitor to
VDD
2
—
GND is required on this pin.
Voltage Sense (VS) is an input used to provide voltage and timing feedback to the
controller. This pin is connected to a voltage divider between an auxiliary winding and
VS
6
I
GND. The value of the upper resistor of this divider is used to program the AC-mains run
and stop thresholds and line compensation at the CS pin.
Copyright © 2015, Texas Instruments Incorporated
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