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PDF ADP8140 Data sheet ( Hoja de datos )
| Número de pieza | ADP8140 | |
| Descripción | 4-Channel High Current LED Driver | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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Data Sheet
4-Channel High Current LED Driver with
Adaptable Power Control
ADP8140
FEATURES
Highly integrated feature set for a high brightness LED
driver solution with minimal external components
4 current sink channels with an adjustable current from
125 µA to 500 mA
Analog and pulse-width modulation (PWM) dimming inputs
Analog and PWM LED current outputs
2% (maximum) matching between LED channels
5% (maximum) LED current accuracy
Operates from VIN of 3 V to 30 V; higher voltages easily
accomplished with an external Zener diode
Operates with LED anode supply voltages up to 100 V dc
Feedback output controls external power source for optimal
efficiency and safety
Multiple ADP8140 IC operation in parallel to control one
power supply
Integrated error amplifier for secondary side control of
isolated power supplies
Easy connection of a temperature thermistor or light sensor
Provides robust protection of the entire system
Power supply overvoltage protection
LED overtemperature protection
LED short-circuit protection
LED open-circuit protection
IC overtemperature protection
Shorted ISET protection
Open ISET and EN protection
Standby mode for low current consumption
Fault indicator output
Small, thermally enhanced, LFCSP package (4 mm × 4 mm)
APPLICATIONS
High brightness LED lighting
Large format LED backlighting
GENERAL DESCRIPTION
The ADP8140 provides high current control of up to four LED
drivers. Each driver can sink up to 500 mA. The sink current is
programmed for all four drivers with one external resistor.
The device features a feedback output that controls an external
power supply for optimal efficiency. The ADP8140 also protects
the LEDs, power supply, and itself against thermal events, short
Rev. 0
Document Feedback
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevices for itsuse,nor foranyinfringementsofpatentsor other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
TYPICAL APPLICATION CIRCUITS
VCC
NTC
ENABLE
FAULT
ADP8140
VIN MIN
REG
VT
MODE
DIM
EN SINK1
FAULT SINK2
FB_OUT SINK3
COMP SINK4
ISET VO_SNS
EXPOSED PAD
Figure 1. ADP8140 Used with Shunt Regulator
AGND VCC BST
FB VIN
ADP2441 BUCK
REGULATOR
COMP
SW
EN PGND
PGOOD FREQ SS
ADP8140
VIN MIN
REG
VT
MODE
DIM
EN SINK1
FAULT SINK2
FB_OUT SINK3
COMP SINK4
ISET VO_SNS
EXPOSED PAD
VIN
Figure 2. ADP8140 Used with Buck
circuits, overvoltages, and LED open circuits. Multiple
ADP8140 ICs are easily connected in parallel to drive additional
LED strings or higher current LEDs. The ADP8140 is available
in a small, thermally enhanced, lead frame chip scale package
(LFCSP).
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
©2015 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
1 page  
ADP8140
Data Sheet
Parameter
Channel Clamp Threshold
Low
High
Channel Clamp Current
Low
High
Channel Clamp Hysteresis
Lowest SINKx Current
INPUT CONTROLS
Input Threshold (Low)
Input Threshold (High)
EN Input Resistance
MODE Pin Pull-Up Current
MODE Threshold 1, 30.1 kΩ
MODE Threshold 2, 52.3 kΩ
MODE Threshold 3
LED Scaling Controls
DIM and VT Limit Voltage
Dimming Accuracy
VT Pull-Up Current Source
DIM Pin Frequency Range
MIN Comparator Hysteresis
MIN Pin PWM Mode
Threshold
PWM Delay and Rise/Fall Time
THERMAL FOLDBACK
(INTERNAL)
Thermal Foldback Threshold
Thermal Shutdown Threshold
Thermal Shutdown Hysteresis
FAULT DETECTION
FAULT Threshold
FAULT Hysteresis
FAULT Filter
FAULT Pull-Down Resistance
VO_SNS
Threshold
Hysteresis
Leakage Current
Open SINKx Fault Threshold
Symbol
VCH_CLMP_LOW
VCH_CLMP_HIGH
ICLMP_LOW
ICLMP_HIGH
VCH_CLMP_HYS
VIL
VIH
REN
IM
VM1
VM2
VM3
VTLIMIT
ILED_DIM1
ILED_DIM2
ILED_DIM3
VMIN_HYS
VMIN_PWM
TFBTHRES
TSDTHRES
TSDHYS
VFAULT_TH
VFAULT_HYS
tFAULT
FAULTPD
VVO_SNS_TH
VVO_SNS_HYS
IVO_SNS
VSFD_OPEN
Test Conditions/Comments
Threshold on SINKx to trigger VCH_CLMP_LOW, MIN pin =
GND
Threshold on SINKx to trigger VCH_CLMP_HIGH
Channel pull-down current when SINKx >
CHCLMP_LOW, RSET = 7.32 kΩ
Channel pull-down current when SINKx >
CHCLMP_HIGH
Hysteresis after either channel clamp is triggered
Output current for DIM = 0 V and RSET = 10 kΩ (see
Figure 15)
EN = 1.2 V
Threshold for increasing mode voltage to enter dc
buffer operation
Threshold for increasing mode voltage to enter
PWM buffer operation
Threshold for increasing mode voltage to enter
PWM EA operation
VT (and DIM if MODE = GND) voltage to produce
100% output current
ILED_DIM1/ILED_100, VT = 1 V, MIN = 0 V, RSET = 25.5 kΩ
ILED_DIM2/ILED_100, DIM = 0.2 V, MODE = GND, RSET =
25.5 kΩ
ILED_DIM3/ILED_100, DIM = 50%,140 Hz, MODE = REG,
RSET = 25.5 kΩ
MODE = REG
Voltage on MIN pin at which VT changes from
scaling LED current to pulsing LED current
Delay from VT low to high (or high to low) to LED
current low to high (or high to low), MIN = REG
Threshold for FAULT comparator
Hysteresis for FAULT comparator
VO_SNS and FAULT shutdown noise filter
Fault activated
Threshold for VO_SNS comparator
Hysteresis for VO_SNS comparator
SINKx pin voltage threshold to remove a sink from
the feedback loop after a VOUT_OVP fault
Min
7.4
14.5
315
430
1.1
15
0.35
0.75
1.25
1.9
48
9.4
48
0.14
2.2
1.14
7
1.176
Typ
7.75
15.1
350
510
1.2
125
400
20
0.4
0.8
1.3
2.0
50
10
50
0.6
55
2.3
20
135
150
20
1.2
100
10
15
1.2
50
80
Max Unit
8.1 V
15.7 V
385 mA
600 mA
V
µA
0.6 V
V
kΩ
24 µA
0.45 V
0.85 V
1.35 V
2.1 V
52 %
10.4 %
52 %
1 µA
40 kHz
mV
2.4 V
µs
°C
°C
°C
1.26 V
mV
µs
20 Ω
1.224
50
V
mV
nA
mV
Rev. 0 | Page 4 of 23
5 Page 
ADP8140
100
–40°C
+25°C
80 +85°C
+125°C
60
40
20
0
0 0.5 1.0 1.5 2.0 2.5 3.0
DIM OR VT VOLTAGE (V)
Figure 16. Typical Sink Current vs. DIM or VT Voltage (MODE = 0, MIN = 0 V)
100
90 –40°C
+25°C
80 +85°C
70 +125°C
60
50
40
30
20
10
0
0 10 20 30 40 50 60 70 80 90 100
VT DUTY CYCLE (%)
Figure 17. Typical Average Sink Current vs. VT Duty Cycle
(MIN = 3 V, VT Frequency = 120 Hz)
Data Sheet
VT
1
ISINK
4
CH1 1V
CH4 100mA
1.0ms
Figure 18. Typical Sink Current Waveforms with PWM on VT Pin (MIN = 3 V)
EN
1
FAULT
2
3
4
CH1 2V
CH2 2V
COMP
ISINK
CH3 1V CH4 200mA 2.00ms
Figure 19. Start-Up Sequence (See Figure 1 Setup)
Rev. 0 | Page 10 of 23
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet ADP8140.PDF ] | |
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