UCC28951
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ZHCSIQ7A –AUGUST 2018 –REVISED DECEMBER 2021
VDD = 12 V, TA = TJ = –40°C to +125°C, CVDD = 1 µF, CREF = 1 µF, RAB = 22.6 kΩ, RCD = 22.6 kΩ, REF = 13.3 kΩ, RSUM
=
124 kΩ, RTMIN = 88.7 kΩ, RT = 59 kΩconnected between RT pin and 5-V voltage supply to set FSW = 100 kHz (FOSC = 200
kHz) (unless otherwise noted). All component designations are from 图8-3.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
ERROR AMPLIFIER
VICM range ensures parameters, the
functionality ensured for 3.6 V < VICM < VREF
+ 0.4 V, and –0.4 V < VICM < 0.5 V
Common-mode input voltage
range
VICM
0.5
3.6
V
VIO
Offset voltage
7
1
mV
µA
–7
–1
IBIAS
Input bias current
V
mA
(EA+) –V(EA–) = 500 mV, IEAOUT = –0.5
3.9
EAHIGH
High-level output voltage
Low-level output voltage
V
V
V
(EA+) –V(EA–) = 500 mV, IEAOUT = –0.5
4.25
mA, TA = 25°C
V
mA
(EA+) –V(EA–) = –500 mV, IEAOUT = 0.5
0.35
EALOW
V
(EA+) –V(EA–) = –500 mV, IEAOUT = 0.5
0.25
mA, TA = 25°C
–8
–0.5
ISOURCE
Error amplifier source current
Error amplifier sink current
mA
mA
TA = 25°C
–3.75
2.7
5.75
ISINK
TA = 25°C
TA = 25°C
TA = 25°C
4.6
100
3
IVOL
Open-loop DC gain
dB
GBW
Unity gain bandwidth(1)
MHz
CYCLE-BY-CYCLE CURRENT LIMIT
1.94
2.06
CS pin cycle-by-cycle
threshold
VCS_LIM
V
TA = 25°C
2
INTERNAL HICCUP MODE SETTINGS
VCS = 2.5 V, VVSS = 4 V
15
3.2
1.9
25
4.2
3.2
Discharge current to set cycle-
by-cycle current limit duration
IDS
µA
V
VCS = 2.5 V, VVSS = 4 V, TA = 25°C
20
3.6
VHCC
Hiccup OFF time threshold
TA = 25°C
TA = 25°C
Discharge current to set
Hiccup Mode OFF Time
IHCC
µA
2.55
SOFT START/ENABLE
VSS = 0 V
TA = 25°C
20
0.25
3.3
30
0.7
ISS
Charge current
µA
V
25
0.5
VSS_STD
VSS_PU
VSS_CL
Shutdown, restart threshold
Pullup threshold
TA = 25°C
TA = 25°C
TA = 25°C
4.3
V
3.7
4.2
4.95
Clamp voltage
V
4.65
Copyright © 2023 Texas Instruments Incorporated
English Data Sheet: SLUSDB2
8
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