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ISL78100 Datasheet, PDF (3/19 Pages) Intersil Corporation – High Power LED Driver
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ISL78100
Electrical Specifications VBAT = VIN = 12V, VDC = 5V, TA = -40°C to +105°C unless otherwise specified. (Continued)
PARAMETER
DESCRIPTION
CONDITIONS
MIN
TYP MAX
UNIT
FBOV FAULT
fSW
fDIMMING
Feedback Overvoltage Fault
Switching Frequency
Maximum Recommended PWM
Dimming Frequency
VLEVEL = 1V, EN/PWM = 3V
220
800
Mode = 1, modulation signal applied to EN/PWM
250 300 mV
1000 1150 kHz
10
kHz
tSWITCH Load Switch Transition Time
RLSDRIVERL Load Switch Driver Impedance Low
RLSDRIVERH Load Switch Driver Impedance High
tFAULT
Fault Timer Period
tDELAY
Start-up Delay
VFAULTPUMP Fault Pin Charge Pump
VBOOST Boost Mode Threshold
VBUCK
Buck Mode Threshold
VMODEL Mode Low Threshold
VMODEH Mode High Threshold
enFAULT
Input Level Applied to TMAX Pin to
Enable Fault Protection
CGATE = 2nF
EN/PWM = 0
EN/PWM = 3V
Timed LX switching delay
VBAT = VIN = 3V
BUCK/BOOSTN = GND
BUCK/BOOSTN = VDC
MODE = GND
MODE = VDC
100
ns
30
50
Ω
30
52
Ω
40
50
60
ms
0.85
1
1.24 ms
6
V
0.94VDC
2/3VDC
0.4VDC V
V
1/3VDC V
V
0.9VDC V
disFAULT
Input Level Applied to TMAX Pin to
Disable Fault Protection
0.96VDC
V
enTEMP
Input Level Applied to TEMP Pin to
Enable Temperature Compensation
0.5
V
disTEMP
Input Level Applied to TEMP Pin to
Disable Temperature Compensation
0.08
V
TCOMPP VFB Positive Temperature
VTEMP/VDC = 0.80
1.26
Compensation; VFB/VFBnom
TCOMPN VFB Negative Temperature
VTEMP/VDC = 0.20
0.74
Compensation; VFB/VFBnom
TTRIP
Internal Temperature Protection
Threshold
135
°C
THYS
Internal Temperature Protection
Hysteresis
25
°C
VEN/PWML
VEN/PWMH
VDCUVLO
RSchottky
EN/PWM Pin Input Low Threshold
EN/PWM Pin Input High Threshold
VDC Undervoltage Lockout
Internal Schottky Diode for Buck
1.2
V
2.5
V
2.6
V
15
23
Ω
.
MODE
1
Don’t Care
0
TABLE 1. LIGHT OUTPUT CONTROL, VDC = 5.0V
TEMP
OPERATING MODE
(VDC - 0.25) > V > 0.25V Standard Mode light level to PWM modulation of EN/PWM input; LED bias current determined by
LEVEL voltage, nominal 1V
V < 0.25V
Disable temperature compensation
V < (VDC - 0.25)
Fixed Bias Mode VFB level internally set to 0.4V, independent of VLEVEL
3
FN6626.0
December 17, 2007
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