TIL5942 Datasheet, PDF (5/19 Pages) Texas Instruments – CURRENT-MODE-PWM CONTROLLER WITH OPTOISOLATED VOLTAGE REFERENCE AND ERROR AMPLIFIER

TIL5942, TIL5942A
CURRENT-MODE-PWM CONTROLLER
WITH OPTOISOLATED VOLTAGE REFERENCE AND ERROR AMPLIFIER
SOES040 – OCTOBER 1997
electrical characteristics over recommended operating junction temperature range, V_CC = 17 V,
R_T = 3.9 kΩ, C_T = 1 nF (unless otherwise noted)
voltage reference/error amplifier
Vref
Vref(dev)
DVref
DVI(LED)
PARAMETER
Reference voltage
Deviation of reference voltage over
temperature
TEST CONDITIONS
TA = 25°C,
VO(COMP) = VI(FB)
II(LED) = 10 mA,
See Figure 2
TIL5942
TIL5942A
TA = 25°C to 100°C,
VO(COMP) = VI(FB)
II(LED) = 10 mA,
See Figure 2
Ratio of reference voltage change to
∆VI(LED) = 4 V to 37 V,
change in input light-emitting-diode voltage II(LED) = 10 mA
MIN TYP MAX UNIT
2.48 2.5 2.52 V
2.49 2.5 2.51 V
25
mV
1.1
2 mV/V
II(FB)
Feedback input current
II(LED) = 10 mA,
See Figure 4
R3 = 10 kΩ
1.5
3 µA
Iref(dev)
IDRV(min)
II(off)
Deviation of reference input current over
full temperature range
Minimum drive current
Off-state input light-emitting diode current
II(LED) = 10 mA,
TA = 25°C to 100°C
TA = 25°C,
VO(COMP) = VI(FB)
VI(LED) = 37 V,
See Figure 5
R3 = 10 kΩ,
See Figure 4
VI(FB) = 0
0.5
µA
0.4
1 mA
0.18 0.5 µA
Zka^†
Regulator output impedance
VO(COMP) = VI(FB)
f ≤ 1 kHz
IO(COMP) = 1 mA to 50 mA
0.1
† _{This symbol is not currently listed within EIA or JEDEC standards for semiconductor symbology.}
LED
PARAMETER
TEST CONDITIONS
VF Forward voltage
TA = 25°C, VO(COMP) = VI(FB), II(LED) = 10 mA, See Figure 2
IR
LED reverse current VO = 6 V
MIN TYP MAX UNIT
1.2 1.4 V
10 µA
PWM Section
voltage reference
PARAMETER
Vref
Vref(line _reg)
Vref(load _reg)
Reference voltage
Reference line regulation
Reference load regulation
Vref(temp _reg) Reference temperature regulation
oscillator
PARAMETER
fosc
t(off)
Frequency
Dead time, (minimum off time)
Minimum timing ramp voltage
Peak timing ramp voltage
TEST CONDITIONS
IO = 1 mA,
TJ = 25°C
VCC = 11 V to 30 V
IO = 0 mA to 20 mA
TA = 25°C to 100°C
TA = 25°C to –40°C
TEST CONDITIONS
R = 3.9 kΩ, C = 1 nF
MIN TYP MAX UNIT
4.95
5 5.05 V
50 mV
25 mV
–4
mV
–4
mV
MIN TYP MAX UNIT
225 250 275 kHz
100 148 200 ns
0.5
V
3.2
V
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