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PDF ISL78171 Data sheet ( Hoja de datos )
| Número de pieza | ISL78171 | |
| Descripción | 50mA Automotive LED Driver | |
| Fabricantes | Intersil | |
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DATASHEET
6-Channel, 50mA Automotive LED Driver with Ultra-high
Dimming Ratio and Phase Shift Control
ISL78171
ISL78171 is a 6-channel, 50mA, LED driver capable of very
high dynamic range dimming. It offers an integrated boost
converter, six high precision, adjustable current sinks and a
SMBus/I2C interface for digital programmability and extensive
diagnostics. These features provide the ISL78171 with the
necessary capabilities to design compact, highly versatile LED
backlight for a wide variety of ambient lighting conditions.
The integrated peak current mode PWM boost converter
operates with a constant frequency and can boost an input
voltage range of 4.5V - 26.5V to an output up to 40V and supply
six strings of LEDs with up to 50mA each. A dynamic headroom
control circuit detects and regulates the highest voltage string to
improve efficiency in multistring configurations.
The six high precision adjustable current sinks offer typical
current matching better than ±1% and a dimming ratio that is
capable of exceeding 60,000:1. The dimming ratio can be
adjusted with either or both the I2C/SMBus and an external
PWM signal. They also feature an optional channel phase shift
control which helps to reduce the input and output
capacitance and ripple, to improve efficiency and to prevent
audible noise.
The SMBus/I2C interface offers a wide range of
programmability that includes the boost FET slew rate control,
individual string enabling and converter switching frequency
selections. It offers a wide range of protection features and
diagnostics that cover all perceivable faults, enabling the
system to self-diagnose the functioning of the backlight and
react to such conditions as failed LEDs. The ISL78171 is offered
in a compact and thermally efficient 20 Ld QFN package with an
ambient temperature range of -40°C to +105°C.
Features
• 6 channels at 50mA maximum per channel
• Input voltage: 4.5V to 26.5V, output voltage: 40V max
• Bootstrap operation Input:3V to 21V output: 26.5V max
• PWM dimming with phase shift control
• SMBus/I2C controlled PWM or DC dimming
• Direct PWM dimming
• Internal PWM dimming mode linearity: 0.4% to 100%,
dimming frequency <30kHz
• Direct PWM dimming duty cycle linearity: 0.007% to 100%
at a dimming frequency of 200Hz
• Current matching ±0.7% typ
• 600kHz/800kHz/1.2MHz selectable switching frequency
• Dynamic headroom control
• Fault protection
- String open/short circuit, OVP, OTP and optional output
short circuit fault protection
• AEC-Q100 qualified
Applications
• Infotainment display LED backlighting
• LCD monitor LED backlighting
• Field sequential RGB LED backlighting
Related Literature
• UG035, “ISL78171EVAL1Z Evaluation Board User Guide”
VIN = 4.5~26.5V
Q1 (OPTIONAL)
ISL78171
1 FAULT
2 VIN
4 VDC
LX 20
OVP 16
PGND 19
7 SMBCLK/SCL
6 SMBDAT/SDA CH0 10
5 PWM
3 EN
CH1 11
CH2 12
CH3 13
17 RSET
CH4 14
8 FPWM
CH5 15
9 AGND
COMP 18
40V, 6 x 50mA*
*VIN > 12V
VIN = 4.5~26.5V
Q1 (OPTIONAL)
ISL78171
1 FAULT
2 VIN
4 VDC
LX 20
OVP 16
PGND 19
7 SMBCLK/SCL
6 SMBDAT/SDA CH0 10
5 PWM
3 EN
CH1 11
CH2 12
CH3 13
17 RSET
CH4 14
8 FPWM
CH5 15
9 AGND
COMP 18
40V, 6 x 50mA*
VIN = 4.5~26.5V
Q1 (OPTIONAL)
*VIN > 12V
ISL78171
1 FAULT
2 VIN
4 VDC
LX 20
OVP 16
8 FPWM
PGND 19
7 SMBCLK/SCL
6 SMBDAT/SDA CH0 10
5 PWM
3 EN
CH1 11
CH2 12
CH3 13
17 RSET
CH4 14
CH5 15
9 AGND
COMP 18
40V, 6 x 50mA*
*VIN > 12V
FIGURE 1A. SMBus/I2C CONTROLLED
DIMMING AND ADJUSTABLE
DIMMING FREQUENCY
FIGURE 1B. PWM DIMMING WITH PWM INPUT
AND ADJUSTABLE DIMMING
FREQUENCY
FIGURE 1. ISL78171 TYPICAL APPLICATION DIAGRAMS
FIGURE 1C. DIRECT PWM DIMMING
June 15, 2015
FN8602.0
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas LLC 2015. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
1 page  
ISL78171
Absolute Maximum Ratings
VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 28V
EN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to VIN - 0.3V
FAULT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . VIN - 8.5V to VIN + 0.3V
VDC, COMP, RSET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 5.5V
SMBCLK/SCL, SMBDAT/SDA, FPWM, PWM . . . . . . . . . . . . . . -0.3V to 5.5V
OVP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 2.8V
CH0-CH5, LX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 42.5V
PGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +0.3V
Above voltage ratings are all with respect to AGND pin
ESD Rating
Human Body Model (Tested per AEC-Q100-002) . . . . . . . . . . . . . . .3.5kV
Machine Model (Tested per AEC-Q100-003) . . . . . . . . . . . . . . . . . . 200V
Charged Device Model (Tested per AEC-Q100-011). . . . . . . . . . . . .1.5kV
Thermal Information
Thermal Resistance (Typical)
JA (°C/W) JC (°C/W)
20 Ld QFN Package (Notes 4, 5, 7) . . . . . .
40
2.5
Thermal Characterization (Typical)
JT (°C/W)
20 Ld QFN Package (Note 6) . . . . . . . . . . . . . . . . . . . . .
1
Maximum Continuous Junction Temperature . . . . . . . . . . . . . . . . .+125°C
Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C
Pb-free Reflow Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see TB493
Operating Conditions
Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-40°C to +105°C
VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.5V to 26.5V
LX max . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40.5V
CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product
reliability and result in failures not covered by warranty.
NOTES:
4. JA is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features. See Tech
Brief TB379.
5. For JC, the “case temp” location is the center of the exposed metal pad on the package underside.
6. JT is the junction-to-top thermal characterization parameter. If the package top temperature can be measured with this rating then the die junction
temperature can be estimated more accurately than the JC and JA thermal resistance ratings.
7. Refer to JESD51-7 high effective thermal conductivity board layout for proper via and plane designs.
Electrical Specifications VIN = 12V, EN = 5V, RSET = 20.1kΩ, unless otherwise noted. Boldface limits apply across the operating
temperature range, -40°C to +105°C.
PARAMETER
DESCRIPTION
TEST CONDITIONS
MIN
(Note 8)
TYP
MAX
(Note 8)
UNIT
GENERAL
VIN (Note 9) Backlight Supply Voltage
≤10 LEDs per channel
(type 3.2V (typ)/20mA)
4.5
26.5
V
IVIN_STBY
IVIN
VIN Shutdown Current
VIN Active Current
VIN = 24V, EN =5V, VDD = 5V.
SDA, SCL are high
5 µA
5 mA
VOUT
Output Voltage
VUVLO
VUVLO_HYS
REGULATOR
Undervoltage Lockout Threshold
Undervoltage Lockout Hysteresis
4.5V < VIN ≤ 26.5V,
fSW = 600kHz
8.55V < VIN ≤ 26.5V,
fSW = 1.2MHz
2.1
200
40
40
2.6
V
V
V
mV
VDC
IVDC_STBY
VLDO
ENLOW
ENHI
tENLow
BOOST
LDO Output Voltage
Standby Current
VDC LDO Load Regulation
EN Input Low Voltage
EN Input High Voltage
EN Low Time To Shutdown
VIN ≥ 6V
EN = 0V
VIN > 5.5V, ILDO=0 to 20mA
4.55
4.8
20
1.8
30.5
5
5
200
0.5
V
µA
mV
V
V
ms
SWILimit
rDS(ON)
SS
Boost FET Current Limit
Internal Boost Switch ON-resistance
Soft-start
TA = +25°C
100% LED Duty Cycle
1.5 2.0
2.7
235 300
7
A
mΩ
ms
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June 15, 2015
5 Page 
ISL78171
Typical Performance Curves LED configuration: 6P10S (Continued)
6P12S, 20mA/CH
VO = 1V/DIV
10.0ms/DIV
ILED = 20mA/DIV
6P12S, 20mA/CH
VO = 1V/DIV
10.0ms/DIV
ILED = 20mA/DIV
FIGURE 20. BOOST OUTPUT VOLTAGE WITH BRIGHTNESS CHANGE
FROM 0% TO 100%, VIN = 12V, 6P12S AT
20mA/CHANNEL
FIGURE 21. BOOST OUTPUT VOLTAGE WITH BRIGHTNESS CHANGE
FROM 100% TO 0%, VIN = 12V, 6P12S AT
20mA/CHANNEL
6P12S, 20mA/CH
VO = 10V/DIV
20.0ms/DIV
ILED = 20mA/DIV
EN
I_VIN = 1A/DIV
FIGURE 22. ISL78171 SHUTS DOWN AND STOPS SWITCHING
~30ms AFTER EN GOES LOW
0.0030
0.0025
0.0020
0.0015
0.0010
0.006
0.007
0.008
FPWM = 200Hz
NO CH CAPS
ILED = 20mA AT 100% DUTY CYCLE
0.009 0.010 0.011 0.012 0.013 0.014
PWM DIMMING DUTY CYCLE (%)
FIGURE 23. DIRECT PWM DIMMING LINEARITY AT VERY LOW DUTY
CYCLE
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11 Page | ||
| Páginas | Total 29 Páginas | |
| PDF Descargar | [ Datasheet ISL78171.PDF ] | |
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