UCC28180
SLUSBQ5A –NOVEMBER 2013–REVISED NOVEMBER 2013
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ELECTRICAL CHARACTERISTICS
Unless otherwise noted, VCC=15Vdc, 0.1µF from VCC to GND, –40°C ≤ TJ = TA ≤ +125°C. All voltages are with respect to
GND. Currents are positive into and negative out of the specified terminal.
PARAMETER
TEST CONDITION
MIN
TYP
MAX
UNITS
VCC Bias Supply
ICCPRESTART
ICCSTBY
ICC Pre-start current
ICC Standby current
ICC Operating current
VCC = VCCOFF – 0.2 V
75
2.95
8.8
µA
mA
mA
VSENSE = 0.5 V
1.80
5.8
2.40
7.0
ICCON_load
VSENSE = 4.0 V, CGATE = 4.7 nF
Under Voltage LockOut (UVLO)
VCCON
VCC Turn on threshold
10.8
9.1
11.5
9.5
12.1
10.3
2.0
V
V
V
VCCOFF
VCC Turn off threshold
UVLO Hysteresis
1.6
1.7
Variable Frequency
Minimum switching frequency
RFREQ = 130 kΩ
RFREQ = 32.7 kΩ
RFREQ = 8.2 kΩ
TA = 25°C
16.3
61.75
225
18.0
65.00
250
19.8
68.25
275
kHz
kHz
kHz
V
fSW
Typical switching frequency
Maximum switching frequency
Voltage at FREQ pin
VFREQ
PWM
DMIN
1.43
1.50
1.56
Minimum duty cycle
Maximum duty cycle
Minimum off time
VSENSE = 5.1 V, ISENSE = –0.25 V
VSENSE = 4.0 V, RFREQ = 32.7 Ω
VSENSE = 3 V, ICOMP = 0.72 V
0%
DMAX
94.8% 96.5% 98.0%
450 570 690
tOFF(min)
ns
System Protection
VSOC
VPCL
ISENSE threshold, soft over current (SOC)
–0.259 –0.295 –0.312
V
V
ISENSE threshold, peak current limit (PCL)
–0.345
–0.4 –0.438
ISENSE bias current, ISENSE open-pin protection
(ISOP)
IISOP
ISENSE = 0 V
–2.30
–2.95
µA
ISENSE threshold, ISENSE open-pin protection
(ISOP)
VISOP
VOLP
ISENSE = open pin
0.085
16.5
100
0.14
17.6
325
V
%VREF
nA
VSENSE threshold, open loop protection (OLP)
ICOMP = 1 V, ISENSE = 0 V
VSENSE = 0.5 V
15.6
Open loop protection (OLP) Internal pull-down
current
VSENSE threshold, output under-voltage detection
(UVD) used for enhanced dynamic response(1)
VUVD
VOVD
93.25
95.00
97.00
%VREF
%VREF
VSENSE threshold, output over-voltage detection
(OVD) used for Enhanced dynamic response(1)
103.00 105.00 106.75
Output over-voltage protection low threshold,
VCOMP is discharged by a 4kΩ resistor when
VSENSE > VOVP_L
VOVP_L
105
107
100
107
109
109
111
%VREF
%VREF
Output over-voltage protection high threshold, PWM
shuts off when VSENSE > VOVP_H
VOVP_H
Output over-voltage protection (VOVP_H) reset
threshold, PWM turns on when VSENSE <
VOVP_H(RST)
VOVP_H(RST)
102
104
%VREF
%VREF
ICOMP threshold, external overload protection
0.20
0.25
Current Loop
gmi
Transconductance gain
0.75
2.7
0.95
±50
3.0
1.10
3.3
mS
µA
V
(1)
Output linear range
ICOMP voltage during OLP
VSENSE = 0 V
(1) Not production tested. Characterized by design
4
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