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
Error Amplifier
V
ICM
range ensures parameters, the functionality
Common mode input voltage
V
ICM
ensured for 3.6 V < V
ICM
< VREF + 0.4 V, and -0.4 0.5 3.6 V
range
V < V
ICM
< 0.5 V
V
IO
Offset voltage - 7 7 mV
I
BIAS
Input bias current -1 1 µA
EA
HIGH
High-level output voltage (EA+) - (EA-) = 500 mV, I
EAOUT
= -0.5 mA 3.9 4.25
V
EA
LOW
Low-level output voltage (EA+) - (EA-) = -500 mV, I
EAOUT
= 0.5 mA 0.25 0.35
I
SOURCE
Error amplifier source current -8 -3.75 -0.5
mA
I
SINK
Error amplifier sink current 2.7 4.6 5.75
I
VOL
Open-loop dc gain 100 dB
GBW Unity gain bandwidth
(2)
3 MHz
Cycle-by-Cycle Current Limit
CS pin cycle-by-cycle
V
CS_LIM
1.94 2 2.06 V
threshold
Propagation delay from CS to Input pulse between CS and GND from zero to 2.5
T
CS
100 ns
OUTC and OUTD outputs V
Internal Hiccup Mode Settings
Discharge current to set
I
DS
cycle-by-cycle current limit CS = 2.5 V, VSS = 4 V 15 20 25 µA
duration
V
HCC
Hiccup OFF Time threshold 3.2 3.6 4.2 V
Discharge current to set
I
HCC
1.90 2.55 3.2 µA
Hiccup Mode OFF Time
Soft Start/Enable
I
SS
Charge current V
SS
= 0 V 20 25 30 µA
Shutdown/restart/reset
V
SS_STD
0.25 0.50 0.70
threshold
V
V
SS_PU
Pull up threshold 3.3 3.7 4.3
V
SS_CL
Clamp voltage 4.20 4.65 4.95
(2) Verified during characterization only.
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