Datasheet

UCC28950
SLUSA16B –MARCH 2010– REVISED OCTOBER 2011 www.ti.com
ELECTRICAL CHARACTERISTICS
(1)
(continued)
V
DD
= 12 V, T
A
= T
J
= -40°C to 125°C, C
VDD
= 1 µF, C
REF
= 1 µF, R
AB
= 22.6 kΩ, R
CD
= 22.6 kΩ , R
EF
= 13.3 kΩ, RSUM = 124
kΩ, RMIN = 88.7 kΩ, RT = 59 kΩ connected between RT pin and 5-V voltage supply to set F
SW
= 100 kHz (F
OSC
= 200 kHz)
(unless otherwise noted). All component designations are from the Typical Application Diagram.
PARAMETER TEST CONDITION MIN TYP MAX UNITS
Light Load Efficiency Circuit
V
DCM
= 0.4 V, Sweep CS confirm there are OUTE
DCM threshold, T = 25°C 0.37 0.39 0.41
and OUTF pulses
DCM threshold, T = 0°C to V
DCM
= 0.4 V, Sweep CS, confirm there are OUTE
V
DCM
0.364 0.390 0.416 V
85°C
(8)
and OUTF pulses
DCM threshold, T= -40°C to V
DCM
= 0.4 V, Sweep CS, confirm there are OUTE
0.35 0.39 0.43
125°C
(8)
and OUTF pulses
I
DCM,SRC
DCM Sourcing Current CS < DCM threshold 14 20 26 µA
T
MIN
Total range R
TMIN
= 88.7 kΩ 425 525 625 ns
OUTPUTS OUTA, OUTB, OUTC, OUTD, OUTE, OUTF
I
SINK/SRC
Sink/Source peak current
(8)
0.2 A
T
R
Rise time C
LOAD
= 100 pF 9 25
ns
T
F
Fall time C
LOAD
= 100 pF 7 25
R
SRC
Output source resistance I
OUT
= 20 mA 10 20 35
Ω
R
SINK
Output sink resistance I
OUT
= 20 mA 5 10 30
THERMAL SHUTDOWN
Rising threshold
(8)
160
Falling threshold
(8)
140 °C
Hysteresis 20
(8) Verified during characterization only.
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