Datasheet

UCC28250
www.ti.com SLUSA29C –APRIL 2010– REVISED JULY 2011
ELECTRICAL CHARACTERISTICS
(1)
(continued)
VDD = 12 V, 1-µF capacitor from VDD and VREF to GND, T
A
= T
J
= -40°C to 125°C, RT = 75 kΩ connected to ground to set
F
SW
= 200 kHz (unless otherwise noted).
PARAMETER TEST CONDITION MIN TYP MAX UNITS
OVP/OTP Comparator
V
OVP
Internal reference 0.66 0.70 0.74 V
I
OVP
Internal current 8.5 11.0 13.5 µA
Primary Outputs
Rise/fall time C
LOAD
= 100 pF 8 ns
R
SRC
Output source resistance I
OUT
= 20 mA 12 20 35
Ω
R
SNK
Output sink resistance I
OUT
= 20 mA 4 12 30
Synchronous Rectifier Outputs
Rise/fall time C
LOAD
= 100 pF 8 ns
I
OUT
= 20 mA, VDD = 12 V 12 20 35
R
SRC
Output source resistance
I
OUT
= 20 mA, VDD = 5 V 15 25 45 Ω
R
SNK
Output sink resistance I
OUT
= 20 mA, VDD = 12 V 4 12 30
PS = VREF -5.0 0 7.5
Primary off to secondary on
TD
PS
PS = 27 kΩ 27 40 50 ns
dead time
PS = 27 kΩ, 25°C 37 40 43
SP = VREF -5.0 0 7.5
Secondary off to primary on
TD
SP
SP = 20 kΩ 30 40 50 ns
dead time
SP = 20 kΩ, 25°C 37 40 43
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