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UCC28251 Datasheet(PDF) 14 Page - Texas Instruments

Part No. UCC28251
Description  UCC28251 Advanced PWM Controller With Prebias Operation
Download  55 Pages
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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UCC28251 Datasheet(HTML) 14 Page - Texas Instruments

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background image
20
5
+
4.1V/4.3V
VDD
18
VREF
EN
LDO
Enable detection
Level&pulse
Over
temperature
Vref ready
OTP
UVLO
Vref OK
Enable
EN_INT
17
ILIM
+
0.5V
Cycle by cycle
current limit
& duty cycle match
OCP delay
timer
19
OVP/OTP
+
0.7V
8.5 mA
OVP
10
HICC
Hiccup
timer
Switching Logic
OCP
9
16
RAMP/CS
3
2
1
13
COMP
FB/EA-
REF/EA+
SS
15
RT
12
SP
11
PS
Oscillator
Deadtime
+
+
+
+
14
OP
gm
CLK
BLANK
+
+
SR_RAMP
generator
8
7
6
VSENSE
4
GND
70ns
leading edge blanking
BLANK
420 mV
UCC28251
SLUSBD8E – FEBRUARY 2013 – REVISED DECEMBER 2014
www.ti.com
8.2 Functional Block Diagram
NOTE
Pin numbers are used for RGP package. PW package has different pin numbers.
8.3 Feature Description
8.3.1 VDD (5/12)
The UCC28251 can be powered up by a wide supply range from 4.3 V (UVLO rising typical) to 20 V (absolute
maximum), making it suitable for primary-side control or secondary-side control. When the voltage at the VDD
pin is lower than 4.1 V (typical), the controller is in stand-by mode and consumes 150 µA (typical) at 3.6 V VDD.
In stand-by mode, VREF continues to be regulated to 3.3 V or follows VDD if VDD is lower than 3.3 V. Please
refer to the VREF description for more detailed information. A minimum 1-µF bypass capacitor is required from
VDD to ground. Keep the bypass capacitor as close to the device as possible.
14
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Copyright © 2013–2014, Texas Instruments Incorporated
Product Folder Links: UCC28251


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