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PDF AL3065 Data sheet ( Hoja de datos )
| Número de pieza | AL3065 | |
| Descripción | FOUR-CHANNEL CURRENT SOURCE BOOST LED DRIVER | |
| Fabricantes | Diodes | |
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AL3065
FOUR-CHANNEL CURRENT SOURCE BOOST LED DRIVER
Description
Pin Assignments
The AL3065 is a high efficiency 4-channel boost controller for WLED
backlight applications. It operates over a wide input voltage ranged
from 4.5V to 33V.
The current of the 4 channels is simply programmed from 20mA to
400mA with an external resistor. The current match between any
channel is ±1.5% (typical). Its operating frequency can be adjusted
from 0.1MHz to 1MHz.
The AL3065 can support three dimming modes: direct PWM dimming,
PWM to analog dimming and DC to analog dimming.
Robust protection features include cycle by cycle current limit, soft-
start, UVLO, programmable OVP, OTP, open/short LED protection,
Schottky Diode Short and Open Protection, Inductor Short-Circuit
Protection and VOUT Short protection.
The IC is available in SO-16 package.
Features
Input Voltage Range: 4.5V to 33V
Drivers up to 4 Strings in Parallel, 250mA per String, 400mA
Pulse Current
±3% Current Precision
Low Ripple for Low BOM Cost
4KV HBM ESD Class
High Voltage Pins CS and OVP for Safety Test
Supports Direct PWM Dimming, PWM to Analog Dimming and
DC to Analog Dimming Control
Minimum PWM Dimming Duty Cycle can be 1/10,000 at 100Hz
Dimming Frequency
LED Open/Short Protection
Schottky Diode/Inductor Short-Circuit Protection
Built-in OCP, OVP, OTP, UVLO, VOUT Short/Schottky Diode
Open Protection
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
(Top Veiw)
CH4 1
ISET 2
OVP 3
RT 4
EN 5
CS 6
OUT 7
VCC 8
16 CH3
15 GND
14 CH2
13 CH1
12 DIM
11 COMP
10 ADIM
9 VIN
SO-16
Applications
LCD Monitor
LCD Display Module
LCD TV
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"
and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
Typical Applications Circuit
VIN
CIN
10mF
ON OFF
10kW
L 10mH
D
OUT
VIN
EN
CS
RCS
0.15W
COUT1
22mF
ROV1
1MW
COUT2
22mF
VOUT
ROV2
51kW
Adjustable
RT
120kW
RC
1kW
CC
0.22mF
RT
COMP
VCC
CVCC
2.2mF
VCC / DC signal / NC
3.3V/ ON OFF
ADIM
DIM
10kW
OVP
CH1
CH4
ISET
GND
RISET
10kW
AL3065
Document number: DS37677 Rev. 1 - 2
1 of 15
www.diodes.com
April 2015
© Diodes Incorporated
1 page  
AL3065
Electrical Characteristics (@TA = +25oC, VIN = 12V, VEN = 5V, unless otherwise specified.)
Symbol
Input Supply
VIN
IQ
ISHDN
VUVLO
VHYS
VCC Regulator
Parameter
Input Voltage
Quiescent Current
Shutdown Supply
Current
Under-Voltage Lockout Voltage
UVLO Hysteresis
VCC VCC Voltage
tRISE
tFALL
–
OUT Pin Rise Time
OUT Pin Fall Time
Load Regulation
– Line Regulation
High Frequency Oscillator
fOSC1
–
Switch Frequency
Switch Frequency Range
DMAX
Max. Duty Cycle
tON-TIME
Minimum On-time
Enable Logic and Dimming Logic
VEN_H
VEN_L
EN High Voltage
EN Low Voltage
VDIM_H
VDIM_L
VADIM
RADIM
Power Switch Drive
PWM Logic for External Dimming
ADIM Voltage Range for DC
Dimming
ADIM Output Resistance
VLIMIT
Current Limit Threshold Voltage
VLIMIT2
D/L Short Threshold Voltage
tLEB Current Sense LEB Time (Note 6)
Compensation and Soft Start (COMP Pin)
IO_H Sourcing Current
IO_L Sinking Current
Conditions
–
No Switching
VEN = 0V
VIN Rising
–
VIN ≥ 5.5V
VIN < 5.5V
OUT Pin Load = 1nF
OUT Pin Load = 1nF
Load = 0 to 30mA
VIN = 12V to 33V
RT = 100kΩ
–
RT = 100kΩ
–
–
–
–
–
–
–
–
–
–
VCOMP = 0.5V
VCOMP = 2V
Min Typ Max Unit
4.5 – 33 V
– 3 – mA
– 1 – µA
3.7 4.0 4.3
V
– 200 – mV
–5–V
– VIN-0.5 –
– 30 –
V
ns
– 30 – ns
– 5 – mV/mA
– 0.3 – mV/V
– 500
0.1 –
88 90
– 200
– kHz
1 MHz
–%
– ns
2.4 – – V
– – 0.5 V
2.5 – – V
– – 0.3 V
0 – 1.5 V
70 100 130 kΩ
– 540 – mV
720 800 880 mV
80 100 150 ns
– 120 –
– 120 –
µA
µA
AL3065
Document number: DS37677 Rev. 1 - 2
5 of 15
www.diodes.com
April 2015
© Diodes Incorporated
5 Page 
AL3065
Application Information (Cont.)
2) Over-Current Protection
The AL3065 integrates an OCP circuit. The CS pin is connected to the voltage-sensor (RCS) placed between the source of the MOSFET and
GND. If the voltage at CS pin exceeds 0.54V, the MOSFET is turned off immediately and will not turn on until the next cycle begins.
3) LED Short-Circuit Protection
The AL3065 integrates an LED Short-Circuit Protection circuit. If the voltage at any of the CH1 to CH4 pins exceeds a threshold of approximately
7.3V during normal operation, the corresponding channel is latched off. Toggle VIN or EN to reset the latch. LED short detecting logic priority is
lower than open LED and OVP logic. The LED short detecting is triggered when 0.1V < VLED_MIN under dimming on mode, and disabled when
LED open occurs until output voltage resumes to the regulated voltage.
4) LED Open-Circuit Protection
The AL3065 integrates an LED Open-Circuit Protection circuit. When any LED string is open, VOUT will boost up until the voltage at OVP pin
reaches an approximate threshold of 2.0V. The IC will automatically ignore the open string whose corresponding pin voltage is less than 100mV
and the remaining string will continue operation. If all the strings are open and the voltage at OVP pin reaches a threshold of 2.0V, the MOSFET
drive gate will turn off and the IC will shut down and latch.
5) VOUT Short/Open Schottky Diode Protection
The AL3065 monitors the OVP pin, if the OVP pin voltage is less than 0.1V, MOSFET drive output will turn off. This protects the converter if the
output Schottky diode is open or VOUT is shorted to ground.
6) Under-Voltage Lockout
The AL3065 provides an under voltage lockout circuit to prevent it from undefined status when it starts up. The UVLO circuit shuts down the
device when VCC drops below 3.8V. The UVLO circuit has 200mV hysteresis, which means the device starts up again when VCC rises to 4.0V.
7) Over-Temperature Protection
The AL3065 features Over-Temperature Protection. If the junction temperature exceeds approximately +160ºC, the IC will shut down until the
junction temperature is less than approximately +140ºC. When the IC is released from over temperature shutdown, it will start a soft-start process.
8) Schottky Diode/Inductor Short-Circuit Protection
The AL3065 features Schottky Diode/Inductor Short-Circuit protection circuit. When CS pin voltage exceeds 0.8V for greater than 16 switching
clocks, the IC will latch off. The voltage of CS pin is monitored after a short delay of tLEB.
9) Shut Down under Abnormal Condition
The AL3065 features Shutdown under Abnormal Condition Protection circuit. When the OVP pin voltage exceeds 3.2V, the IC will latch off. Toggle
EN pin to restart the IC. This feature can be used to shut down the IC under any defined abnormal condition.
AL3065
Document number: DS37677 Rev. 1 - 2
11 of 15
www.diodes.com
April 2015
© Diodes Incorporated
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet AL3065.PDF ] | |
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