ISL78171 Datasheet, PDF (6/29 Pages) Intersil Corporation – 6-Channel, 50mA Automotive LED Driver with Ultra-high Dimming Ratio and Phase Shift Control

ISL78171
Electrical Specifications V_IN = 12V, EN = 5V, R_SET = 20.1kΩ, unless otherwise noted. Boldface limits apply across the operating
temperature range, -40°C to +105°C. (Continued)
PARAMETER
DESCRIPTION
TEST CONDITIONS
MIN
(Note 8) TYP
MAX
(Note 8)
UNIT
Eff_peak Peak Efficiency
I_OUT/V_IN
D_MAX
Line Regulation
Boost Maximum Duty Cycle
D_MIN
Boost Minimum Duty Cycle
f_{OSC_lo}
f_{OSC_hi}
I_{LX_leakage}
LXstart_thres
Lx Frequency Low
Lx Frequency High
LX Pin Leakage Current
LX Start-up Threshold
V_IN = 12V, 72 LEDs, 20mA each,
L = 10µH with DCR 101mΩ,
T_A = +25°C
V_IN = 12V, 60 LEDs, 20mA each,
L = 10µH with DCR 101mΩ,
T_A = +25°C
4.5V < V_IN ≤ 26V, f_SW = 600kHz
f_SW = 600kHz
f_SW = 1.2MHz
f_SW = 600kHz
f_SW = 1.2MHz
Configuration Reg FSW bit=1
Configuration Reg FSW bit=0
LX = 40V, EN = 0V
92.9
%
90.8
%
0.1
%
90
%
81
9.5
%
17
475
600
640
kHz
0.97
1.2
1.31
MHz
10
µA
0.9
1.2
V
ILXStart-up LX Start-up Current
1
3.5
5
mA
FAULT DETECTION
V_SC
Short circuit Threshold Accuracy
Measured on the CHx pin
7.5
8.2
V
Temp_shtdwn Temperature Shutdown Threshold
150
°C
Temp_Hyst Temperature Shutdown Hysteresis
23
°C
V_OVPlo
Overvoltage threshold on OVP Pin
CURRENT SINKS
1.15
1.21
1.27
V
I_MATCH
DC Channel-to-channel Current Matching
R_SET = 20.1kΩ, Reg0x00 = 0xFF,
(I_LED = 20mA)
±0.7
±1.5
%
I_ACC
Current Accuracy
R_SET = 20.1kΩ, Reg0x00 = 0xFF,
-2.2
(I_LED = 20mA)
+2.2
%
V_HEADROOM
Dominant Channel Current Sink Headroom at I_LED = 20mA
CHx Pin
T_A = +25°C
500
mV
V_RSET
Voltage at RSET Pin
R_SET = 20.1kΩ
1.17
1.22
1.25
V
I_LED(max)
Maximum LED Current per Channel
V_IN = 12V, V_OUT = 40V, f_SW = 1.2MHz,
50
mA
T_A = +25°C
PWM GENERATOR
V_IL
V_IH
F_PWMI
PWMACC
PWM Input Low Voltage
PWM Input High Voltage
PWM Input Frequency Range
PWM Dimming Accuracy (Except Direct PWM
Dimming)
0.8
V
1.5
5.0
V
200
30,000
Hz
8
bits
t_DIRECTPWM
F_PWM
FAULT PIN
Direct PWM Minimum On Time
PWM Dimming Frequency Range
Direct PWM Mode
250
350
ns
100
30,000
Hz
I_FAULT
V_FAULT
Fault Pull-down Current
Fault Clamp Voltage with Respect to V_IN
V_IN = 12V
V_IN = 12, V_IN - V_FAULT
12
21
30
µA
6
7
8.3
V
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6
FN8602.0
June 15, 2015