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UCC28251 Datasheet(PDF) 8 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) 8 Page - Texas Instruments

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UCC28251
SLUSBD8E – FEBRUARY 2013 – REVISED DECEMBER 2014
www.ti.com
Electrical Characteristics
(1) (continued)
VDD = 12 V, 1-µF capacitor from VDD and VREF to GND, TA = TJ = –40°C to 125°C, RT = 75 kΩ connected to ground to set
FSW = 100 kHz (unless otherwise noted).
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
OVP/OTP COMPARATOR
VOVP
Internal reference
0.66
0.70
0.74
V
IOVP
Internal current
6.0
8.5
11.0
µA
PRIMARY OUTPUTS
Rise/fall time
CLOAD = 100 pF
8
ns
RSRC
Output source resistance
IOUT = 20 mA
12
20
35
Ω
RSNK
Output sink resistance
IOUT = 20 mA
4
12
30
SYNCHRONOUS RECTIFIER OUTPUTS
Rise/fall time
CLOAD = 100 pF
8
ns
IOUT = 20 mA, VDD = 12 V
12
20
35
RSRC
Output source resistance
IOUT = 20 mA, VDD = 5 V
15
25
45
Ω
RSNK
Output sink resistance
IOUT = 20 mA, VDD = 12 V
4
12
30
PS = VREF
–5.0
0
7.5
Primary off to secondary on
TDPS
PS = 27 k
Ω
25
38
48
ns
dead time
PS = 27 k
Ω, 25 °C
32
38
43
SP = VREF
–5.0
0
7.5
Secondary off to primary on
TDSP
SP = 20 k
Ω
33
43
55
ns
dead time
SP = 20 k
Ω, 25 °C
39
43
48
8
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Product Folder Links: UCC28251


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