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UCC28251 Datasheet(PDF) 28 Page - Texas Instruments

Part No. UCC28251
Description  UCC28251 Advanced PWM Controller With Prebias Operation
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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UCC28251 Datasheet(HTML) 28 Page - Texas Instruments

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VREF
OVP
UCC28251
+
0.7 V
8.5 ?A
R3
R1
R2
VIN or VOUT
NTC
R4
4
NTC1
0.7 V
R
R
3.3 V
0.7 V
=
´
-
UCC28251
SLUSBD8E – FEBRUARY 2013 – REVISED DECEMBER 2014
www.ti.com
Feature Description (continued)
(21)
Because of the interaction between the two voltage dividers, over temperature protection thresholds move
slightly with the different input voltages.
Figure 38. Overvoltage and Overtemperature Protection With Single OVP Pin
8.3.16 OUTA (9/16) and OUTB (8/15)
OUTA and OUTB are the primary-side switch control signals. With the 0.2-A peak current capability, an external
gate driver is required.
8.3.17 SRA (7/14) and SRB (6/13)
SRA and SRB are the synchronous rectifier control signals. With the 0.2A peak current capability, an external
gate driver is required.
8.3.18 GND (4/11)
GND pin is the ground reference for the whole device. Tie all the signal returns to this pin.
8.4 Device Functional Modes
The UCC28251 can be controlled using either voltage mode or current mode. RAMP/CS is a multi-function pin
used either to generate the ramp signal for voltage mode control or to sense current for current mode control.
Please refer to RAMP/CS (PWM Ramp Input or Current Sense Input) (16/3) for the details.
28
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Product Folder Links: UCC28251


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