Datasheet

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ELECTRICAL CHARACTERISTICS
UCC28019
SLUS755B – APRIL 2007 – REVISED DECEMBER 2007
Unless otherwise noted, VCC = 15 V
DC
, 0.1 µ F from VCC to GND, -40 ° C ≤ T
J
= T
A
≤ 125 ° C. All voltages are with respect to
GND. Currents are positive into and negative out of the specified terminal.
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
VCC Bias Supply
I
VCC(start)
Pre-start current VCC = VCC
ON
– 0.1 V 25 100 200 µ A
I
VCC(stby)
Standby current VSENSE = 0.5 V 1.0 2.1 2.9
mA
I
VCC(on_load)
Operating current VSENSE = 4.5 V, C
GATE
= 4.7 nF 4 7 10
Under Voltage Lockout (UVLO)
VCC
ON
Turn on threshold 10.0 10.5 11.0
VCC
OFF
Turn off threshold 9 9.5 10 V
UVLO Hysteresis 0.8 1.0 1.2
Oscillator
T
A
= 25 ° C 61.7 65.0 68.3
f
SW
Switching frequency, kHz
– 40 ° C ≤ T
A
≤ 125 ° C 59 65 71
PWM
VCOMP = 0 V, VSENSE = 5 V,
D
MIN
Minimum duty cycle 0%
ICOMP = 6.4 V
D
MAX
Maximum duty cycle VSENSE = 4.95 V 94% 97% 99.3%
t
OFF(min)
Minimum off time VSENSE = 3 V, ICOMP = 1 V 100 250 600 ns
System Protection
ISENSE threshold, soft over current
V
SOC
-0.66 -0.73 -0.79
(SOC) ,
ISENSE threshold, peak current Limit
V
PCL
-1.00 -1.08 -1.15 V
(PCL) ,
VSENSE threshold, open loop ICOMP = 1 V, ISENSE = 0 V,
V
OLP
0.77 0.82 0.86
protection (OLP), VCOMP = 1 V
Open loop protection (OLP) internal
VSENSE = 0.5 V 100 250 nA
pull-down current
VSENSE threshold, output
V
UVD
4.63 4.75 4.87
under-voltage detection (UVD),
VSENSE threshold, output
V
OVP
ISENSE = -0.2 V 5.12 5.25 5.38
over-voltage protection (OVP),
V
Input brown-out detection (IBOP)
VINS
BROWNOUT_th
0.76 0.82 0.88
high-to-low threshold
Input brown-out Detection (IBOP)
VINS
ENABLE_th
1.4 1.5 1.6
low-to-high threshold
I
VINS_0 V
VINS bias current VINS = 0 V 0 ± 0.1 µ A
ICOMP threshold, external overload
0.6 V
protection
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