ISL97687 Datasheet, PDF (7/24 Pages) Intersil Corporation – 4-Channel LED Driver with Phase Shift Control and 10-Bit Dimming Resolution

ISL97687
Electrical Specifications All specifications below are characterized at T_A = -40°C to +105°C; V_IN = 12V, EN = 5V. Boldface limits apply
over the operating temperature range, -40°C to +105°C. (Continued)
PARAMETER
DESCRIPTION
CONDITION
MIN
MAX
(Note 8) TYP (Note 8) UNIT
V_GD
D_MAX
D_MIN
f_SW
Gate Driver Output Voltage
Boost Maximum Duty Cycle
Boost Minimum Duty Cycle
Boost Switching Frequency
EFF_PEAK
REFERENCE
Boost Peak Efficiency
C_{OUT_SW} = 1000pF
f_SW = 600kHz
f_SW = 1.2MHz
R_OSC = 250kΩ
R_OSC = 83kΩ
R_OSC = 42kΩ
10
V
92
%
26
%
180
200
220 kHz
540
600
660 kHz
1.08
1.2
1.32 MHz
90
%
I_MATCH
Channel-to-Channel Current Matching
I_ACC
Absolute Current
FAULT DETECTION
Channels are in a single IC,
-2
±1
2
%
I_LED: 100mA
R_ISET1/2 = 28.7kΩ
-3
3
%
V_SC
Channel Short Circuit Threshold
V_TEMP
Over-Temperature Threshold
V_{TEMP_ACC}
Over-Temperature Threshold Accuracy
V_{OVP_OUT}
Overvoltage Limit on OVP Pin
V_{OVP_IN}
Overvoltage Limit on VIN Pin
DIGITAL I/O LOGIC LEVEL SPECIFICATIONS
7.2
1.18
8
150
5
1.22
35
8.8
V
°C
°C
1.24
V
V
V_IL
Logic Input Low Voltage - STV, EN_PS, EN_VSYNC,
EN_ADIM, PWMI, CSEL, EN
0.8
V
V_IH
Logic Input Low Voltage - STV, EN_PS, EN_VSYNC,
EN_ADIM, PWMI, CSEL, EN
1.5
5.5
V
STV
Frame frequency
30
240 Hz
CURRENT SOURCES
V_HEADROOM
Dominant Channel Current Source Headroom at CH Pin
V_ISET1,2
Voltage at ISET1 and 2 Pins
I_{LED_MAX}
Maximum LED Current per Channel
PWM GENERATOR
I_LED = 160mA
T_A = +25°C
1.18
160
0.75
1.21
V
1.24
V
mA
f_PWM
Generated PWM Frequency
Dimming Range
f_PWMI
V_{PWM_SET}
V_ACTL
PWM Dimming Duty Cycle Limits
PWMI Input Frequency Range
PWM_SET Voltage
Analog Dimming Input
R_{PWM_SET} = 333kΩ
R_{PWM_SET} = 3.3kΩ
f_PWM ≤ 20kHz
R_{PWM_SET} = 3.3kΩ
0% Dimming
100% Dimming
45
4.5
0.1
60
1.18
0.28
2.95
50
5
1.21
0.3
3
55
Hz
5.5 kHz
100
%
20k Hz
1.25
V
0.31
V
3.1
V
t_{PWM_MIN}
Minimum PWM On Time in Direct PWM Mode
350
ns
NOTES:
8. Parameters with MIN and/or MAX limits are 100% tested at +25°C, unless otherwise specified. Temperature limits established by characterization
and are not production tested.
9. At maximum V_IN of 32V, minimum V_OUT is 35V. Minimum V_OUT can be lower at lower V_IN.
7
FN7714.0
September 15, 2011