Datasheet
ELECTRICAL CHARACTERISTICS
UCC28019A
www.ti.com
.................................................................................................................................................. SLUS828B – DECEMBER 2008 – REVISED APRIL 2009
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 CONDITION MIN TYP MAX UNITS
VCC Bias Supply
ICC
PRESTART
ICC pre-start current VCC = VCC
ON
– 0.1 V 25 100 200 µ A
ICC
STBY
ICC standby current VSENSE = 0.5 V 1 2.2 2.9
mA
ICC
ON_load
ICC operating current VSENSE = 4.5 V, C
GATE
= 4.7 nF 4 7.5 10
Under Voltage Lockout (UVLO)
VCC
ON
VCC turn on threshold 10 10.5 11
VCC
OFF
VCC turn off threshold 9 9.5 10 V
UVLO hysteresis 0.8 1 1.2
Oscillator
T
A
= 25 ° C 61.7 65 68.3
f
SW
Switching frequency -25 ° C ≤ T
A
≤ 125 ° C 59 65 71 kHz
-40 ° C ≤ T
A
≤ 125 ° C 57 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% 98% 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)
V
ISENSE threshold, Peak Current Limit
V
PCL
-1 -1.08 -1.15
(PCL)
ISENSE bias current, ISENSE Open-Pin
I
ISOP
ISENSE = 0 V -2.1 -4.0 µ A
Protection (ISOP)
ISENSE threshold, ISENSE Open-Pin
V
ISOP
ISENSE = open pin 0.082
Protection (ISOP)
V
VSENSE threshold, Open Loop ICOMP = 1 V, ISENSE = -0.1 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)
(1)
VSENSE threshold, output Over-Voltage
V
OVP
ISENSE = -0.1 V 5.12 5.25 5.38
Protection (OVP)
V
V
INSBROWNOUT
Input Brown-Out Detection (IBOP)
0.76 0.82 0.88
_th
high-to-low threshold
Input Brown-Out Detection (IBOP)
V
INSENABLE_th
1.4 1.5 1.6
low-to-high threshold
I
VINS_0V
VINS bias current VINS = 0 V 0 ± 0.1 µ A
ICOMP threshold, external overload
0.6 V
protection
(1) Not production tested. Characterized by design.
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