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ISL97672A 데이터시트 PDF




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부품번호 ISL97672A 기능
기능 6-Channel LED Driver
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ISL97672A 데이터시트, 핀배열, 회로
NROETCROEMCMOEMNMDEEISNDLDR9E7ED6P7FL2OABRCENMEEWNDTEPSAIRGTNS
6-Channel LED Driver with Ultra Low Dimming
Capability
ISL97672A
The ISL97672A is an integrated 6-channel power LED driver for
LCD backlight applications. The ISL97672A is capable of
driving LEDs with input from 4.5V to 26.5V and maximum
output up to 45V.
The ISL97672A employs an adaptive boost switching
architecture that allows Direct PWM dimming with dimming
duty cycle as low as 0.007% at 200Hz or 0.8% at 20kHz. PWM
Dimming frequency can be as high as 30kHz.
The ISL97672A employs the dynamic headroom control that
monitors the highest LED forward voltage string for output
regulation to minimize headroom voltage and power loss in a
typical multi-string operation. Typical current matching between
channels is ±0.7%.
The ISL97672A incorporates extensive protection functions
that flag whenever a fault occurs. The protections include
string-open and short-circuit detections, OVP, OTP, and an
optional output short-circuit protection with external fault
disconnect switch.
The ISL97672A is offered in a compact 20 Ld QFN 3x4 package
and can operate in ambient temperatures of -40°C to +85°C.
Features
• 6 x 50mA Channels
• 4.5V to 26.5V Input
• 45V Output Max
• Adaptive Boost Switching Architecture
• Direct PWM Dimming with Dimming Linearity of
0.007%~100% at 200Hz or 0.8%~100% <20kHz
• Adjustable 200kHz to 1.4MHz Switching Frequency
• Dynamic Headroom Control
• Fault Protections with Latched Flag Indication
- String Open/Short Circuit
- OVP
- OTP
- Optional Output Short-Circuit Fault Protection Switch
• Current Matching ±0.7%
• 20 Ld 3x4 QFN Package
Applications
• Notebook Displays LED Backlighting
• LCD Monitor LED Backlighting
• Multi-Function Printer Scanning Light Source
Typical Application Circuit
VIN = 4.5~26.5V
Q1(OPTIONAL)
VOUT = 45V*, 6 x 50mA
ISL97672A
1 FAULT
2 VIN
4 VDC
LX 20
OVP 16
6 FLAG
18 COMP
3 EN
5 PWM
17 RSET
8 FSW
9 AGND
PGND 19
CH0 10
CH1 11
CH2 12
CH3 13
CH4 14
CH5 15
*VIN > 12V
FIGURE 1. ISL97672A TYPICAL APPLICATION DIAGRAM
November 22, 2013
FN7710.3
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 2011, 2013. 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.




ISL97672A pdf, 반도체, 판매, 대치품
ISL97672A
Absolute Maximum Ratings (TA = +25°C)
VIN, EN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 28V
FAULT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . VIN - 8.5V to VIN + 0.3V
VDC, COMP, RSET, PWM, OVP, FSW . . . . . . . . . . . . . . . . . . . . . -0.3V to 5.5V
CH0 - CH5, LX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 45V
PGND, AGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 0.3V
NOTE: Voltage ratings are with respect to AGND pin.
ESD Rating
Human Body Model (Tested per JESD22-A114E) . . . . . . . . . . . . . . . . 3kV
Machine Model (Tested per JESD22-A115-A) . . . . . . . . . . . . . . . . . 300V
Charged Device Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1kV
Thermal Information
Thermal Resistance (Typical)
θJA (°C/W) θJC (°C/W)
20 Ld QFN Package (Notes 4, 5, 7) . . . . . .
40
2.5
Thermal Characterization (Typical)
PSIJT (°C/W)
20 Ld QFN Package (Note 6) . . . . . . . . . . . . . . . . . . . . .
1
Maximum Continuous Junction Temperature . . . . . . . . . . . . . . . . .+125°C
Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C
Operating Conditions
Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40°C to +85°C
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. θJA is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features. See Tech
Brief TB347.
5. For θJC, the “case temp” location is the center of the exposed metal pad on the package underside.
6. PSIJT is the junction-to-top thermal resistance. If the package top temperature can be measured, with this rating then the die junction temperature
can be estimated more accurately than the θJA and θJC thermal resistance ratings.
7. Refer to JESD51-7 high effective thermal conductivity board layout for proper via and plane designs.
Electrical Specifications All specifications are tested at TA = +25°C, VIN = 12V, EN = 5V, RSET = 20.5kΩ, unless otherwise noted. Boldface
limits apply over the operating junction temperature range, -40°C to +85°C.
PARAMETER
DESCRIPTION
CONDITION
MIN MAX
(Note 8) TYP (Note 8) UNIT
GENERAL
VIN (Note 10) VIN Supply Voltage
IVIN VIN Current
TC = <+60°C
TA = +25°C
EN = 5V
4.5
26.5
V
5 mA
IVIN_STBY
VOUT
VIN Shutdown Current
Output Voltage
VUVLO
Undervoltage Lock-out Threshold
VUVLO_HYS
Undervoltage Lock-out Hysteresis
ENABLE AND PWM GENERATOR
TA = +25°C
4.5V < VIN 26V,
FSW = 600kHz
8.55V < VIN 26V,
FSW = 1.2MHz
4.5V < VIN 8.55V,
FSW = 1.2MHz
5 µA
45 V
45 V
VIN/0.19
V
2.1 2.6 V
200 mV
VIL
VIH
FPWM
Guaranteed Range for PWM Input Low Voltage
Guaranteed Range for PWM Input High Voltage
PWM Input Frequency Range
0.8 V
1.5 VDD V
200
30,000
Hz
tON Minimum On Time
250 350 ns
4 FN7710.3
November 22, 2013

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ISL97672A 전자부품, 판매, 대치품
ISL97672A
Typical Performance Curves (Continued)
100
90
80
70 +25°C
60 +85°C
0°C
-40°C
50
40
30
20
10
0
0 5 10 15 20 25 30
VIN
FIGURE 7. EFFICIENCY vs VIN vs TEMPERATURE AT 20mA (100%
LED DUTY CYCLE)
0.40
0.30
0.20
0.10
0.00
-0.10
4.5 VIN
12 VIN
-0.20
-0.30
21 VIN
-0.40
0123456
CHANNEL
FIGURE 8. CHANNEL-TO-CHANNEL CURRENT MATCHING
7
1.2
1.0
0.8
4.5 VIN
0.6
12 VIN
0.4
0.2
0
0123456
PWM DIMMING DUTY CYCLE (%)
FIGURE 9. CURRENT LINEARITY vs LOW LEVEL PWM DIMMING
DUTY CYCLE vs VIN
0.60
0.55
+25°C
-40°C
0.50
0.45
0°C
0.40 0
5 10 15 20 25 30
VIN (V)
FIGURE 10. VHEADROOM vs VIN vs TEMPERATURE AT 20mA
VO = 50mV/DIV
2.00µs/DIV
FIGURE 11. VOUT RIPPLE VOLTAGE, VIN = 12V, 6P12S AT
20mA/CHANNEL
VV__OOUUTT
VV__EENN
VV__LLXX
I_I_IINNDDUUCCTOTROR
FIGURE 12. START UP WAVEFORMS AT VIN = 6V FOR 6P12S AT
20mA/CHANNEL
7 FN7710.3
November 22, 2013

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