Datasheet

UCC25600
www.ti.com SLUS846B –SEPTEMBER 2008– REVISED JULY 2011
ELECTRICAL CHARACTERISTICS
over operating free-air temperature range, −40°C < T
A
< 125°C, T
J
= T
A
, VCC = 12 V, GND = 0 V, R
RT
= 4.7 kΩ, R
DT
= 16.9
kΩ, C
VCC
= 1 μF, (unless otherwise noted)
SYMBOL PARAMETER TEST CONDITIONS MIN TYP MAX UNITS
Bias Supply (VCC)
VCC current, disabled SS = 0 V 1 1.5
mA
VCC current, enabled SS = 5 V, C
GD1
= C
GD2
= 1 nF 2.5 5 7.5
VCC current, UVLO VCC = 9 V 100 400 μA
UVLO turn-on threshold Measured at VCC rising 9.9 10.5 11.1
V
UVLO
UVLO turn-off threshold Measured at VCC falling 8.9 9.5 10.1
UVLO hysteresis Measured at VCC 0.7 1 1.3
V
OVP turn-off threshold Measured at VCC rising 18 20 22
V
OVP
OVP turn-on threshold Measured at VCC falling 16 18 20
OVP hysteresis Measured at VCC 1.5 2 2.5
Dead Time (DT)
T
DT
Dead time R
DT
= 16.9 kΩ 390 420 450 ns
Oscillator
-40°C to 125°C 40.04 41.70 43.36
Minimum switching frequency at
F
SW(min)
kHz
GD1, GD2
-20°C to 105°C 40.45 41.70 42.95
K
ICO
Switching frequency gain/I (RT) R
RT
= 4.7 kΩ, I
RT
= 0 to 1 mA 60 80 100 Hz/μA
GD1, GD2 on time mismatching -50 50 ns
Switching frequency starting burst
F
SW_BM
SS = 5 V 300 350 400
mode
Switching frequency to come out of
SS = 5 V 280 330 380
kHz
burst mode
-40°C to 125°C 122 142.5 162
F
SW(start)
Switching frequency at soft start
-20°C to 105°C 125 142.5 160
External Disable/Soft Start
Enable threshold Measure at SS rising 1.1 1.2 1.3
Disable threshold Measured at SS falling 0.85 1 1.1 V
Disable hysteresis Measured at SS 0.15 0.35
Measured between SS (falling) and
Disable prop. delay 250 500 750 ns
GD2 (falling)
Source current on ISS pin V
SS
= 0.5 V -225 -175 -125
I
SS
μA
Source current on ISS pin V
SS
= 1.35 V -5.5 -5 -4.5
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