UCC28810_15 Datasheet, PDF (4/34 Pages) Texas Instruments – LED LIGHTING POWER CONTROLLER

UCC28810
UCC28811
SLUS865 – OCTOBER 2008.............................................................................................................................................................................................. www.ti.com
ELECTRICAL CHARACTERISTICS
–40°C ≤ T_A = T_J ≤ 105°C, V_VDD = 12 V_DC, C_GDRV = 0.1-µF from VDD to GND, all voltages are with respect to GND.
PARAMETER
TEST CONDITIONS
MIN TYP MAX UNIT
SUPPLY
V_VDD
I_VDD
UVLO
Operating voltage
Shunt voltage
Supply current, off
Supply current, disabled
Supply current, on
Supply current, dynamic operating
I_VDD = 25 mA
V_VDD = V_VDD turn-on threshold –300 mV
V_VSENSE = 0.5 V
75 kHz, C_GDRV = 0 nF
75 kHz, C_GDRV = 1 nF
18
V
18
19
20
75
125 µA
2
4
4
6 mA
5
7
VDD turn-on threshold
UCC28810
UCC28811
15.4 15.8 16.4
12.0 12.5 13.0 V
VDD turn-off threshold
9.4
9.7 10.0
V_UVLO
UVLO hysteresis
UCC28810
UCC28811
5.8
6.3
6.8
V
2.3
2.8
3.3
VOLTAGE AMPLIFIER (VSENSE)
V_REF
I_BIAS
g_M
Internal voltage reference
Input bias current
EAOUT high
EAOUT low
Transconductance
I_EAOUT,SRC Source current
V_VSENSE = 2.1 V
V_VSENSE = 2.55 V
T_J = 25°C, V_EAOUT = 3.5 V
UCC28810
UCC28811 ^{VVSENSE = 2.1 V, VEAOUT = 3.5 V}
2.45
4.5
60
–0.2
–200
2.50
1.80
90
–1.0
–300
2.55 V
0.5 µA
5.5 V
2.45 V
130 µS
mA
–400 µA
I_EAOUT,SNK Sink current
OVERVOLTAGE PROTECTION / ENABLE (VSENSE)
V_VSENSE = 2.1 V, V_EAOUT = 3.5 V
0.2
1.0
mA
V_OV(ref)
Overvoltage reference
UCC28810
UCC28811
V_VREF+ V_VREF V_VREF
0.165 +0.190 +0.210
V
V_VREF+ V_VREF+ V_VREF+
0.150 0.180 0.210
Hysteresis
UCC28810
UCC28811
175
200
225
mV
150
180
210
Enable threshold
UCC28810
UCC28811
0.62 0.67 0.72
V
0.18 0.23 0.28
Enable hysteresis
0.05 0.10 0.20 V
CURRENT REFERENCE GENERATOR
K
V_EAOUT
Current reference generator gain constant
Dynamic input range, V_VINS INPUT
Error amplifier dynamic input range
V_VINS = 0.5 V, V_EAOUT = 3.5 V
0.43 0.65
0 to 2.5 0 to 3.5
2.5 to 2.5 to
3.8
4.0
0.87 1/V
V
V
Input bias current, VINS
0.1
1.0 µA
4
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