IS31BL3233A 2MHZ 1.5A FLASH/TORCH LED DRIVER DESCRIPTION
RECOMMENDED EQUIPMENT
The IS31BL3233A is the ideal solution for high-power flash LEDs used in cell phone camera or digital still camera applications. It is a highly integrated step up DC-DC converter with a 2MHz switching frequency, enabling a small total space solution for portable photo flash. The IS31BL3233A has separate Flash Mode and Torch Mode enable pins for maximum flexibility. The Flash Mode and Torch Mode LED currents are programmed by external resistors respectively, making the flash LED solution simple to control. If both enable pins are at logic high, the LED current will be programmed by the Torch Mode setting resistor. The two LED output sinks can be shorted together externally for higher power single flash LEDs, up to 1.5A continuous LED current. Thermal regulation is integrated in Flash Mode to limit the IC’s temperature and continuously provide the maximum allowed output current.
ABSOLUTE MAXIMUM RATINGS
Input voltage range: 2.7V~5.5V Dual flash LED outputs Drive up to total 1.5A or 0.75A per channel 1s time out in Flash Mode to protect LED High efficiency up to 93% (1A, Flash Mode) Independent Flash Mode enable and Torch Mode enable pins Torch Mode dimming via PWM control Integrated thermal regulation control LED open/short protection Over-voltage protection Cycle-by-cycle inductor current limit Pb-free package: DFN-14 (2mm × 3mm)
≤ 5.5V power supply
Caution: Do not exceed the conditions listed above, otherwise the board will be damaged.
PROCEDURE The IS31BL3233A evaluation board is fully assembled and tested. Follow the steps listed below to verify board operation. Caution: Do not turn on the power supply until all connections are completed.
1)
FEATURES
2.7V~5.5V, 2A power supply
2) 3)
Connect the ground terminal of the power supply to the GND and the positive terminal to the VCC. Or connect the DC power to the connector (DC IN). Turn on the power supply and pay attention to the supply current. If the current exceeds 2A, please check for circuit fault. Press Torch (K2) or Flash lamp (K1) button to enable the respective function.
EVALUATION BOARD OPERATION The evaluation board is controlled by LPC922 (8051 core). IS31BL3233A evaluation board demonstrates the Flash and Torch modes by switching between modes when the corresponding buttons are pressed. 1)
QUICK START
Torch Mode: The “Bright+” (K3) and “Bright-” (K4) buttons are used to control the WLED brightness. There are five selectable levels, the LEDs on the left graphically show the brightness level. The default power on level is D1, the lowest level. The “Torch” button is used to Enable/Disable this mode. 2) Flash Mode: Once pressed the white LEDs will flash ON for one second. External Support: Jumper JP1 is closed (default). Remove the jumper on JP1 (on board LPC922 MCU disabled) if you want to use an external MCU control. Connect the external MCU I/O signals to the TP4 connector to directly control the IC’s ENF and ENM input pins. (VIL 1.4V for ENF and ENM) SOFTWARE SUPPORT
Figure 1: Photo of IS31BL3233A Evaluation Board
Please refer to the integrated program. Please refer to the datasheet to get more information about IS31BL3233A.
Integrated Silicon Solution, Inc. – www.issi.com Rev. A, 10/28/2014
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IS31BL3233A 2MHZ 1.5A FLASH/TORCH LED DRIVER ORDERING INFORMATION Part No.
Temperature Range
Package
IS31BL3233A-DLS2-EB
-40°C ~ +85°C (Industrial)
DFN-14, Lead-free
Table1: Ordering Information
For pricing, delivery, and ordering information, please contacts ISSI’s analog marketing team at
[email protected] or (408) 969-6600.
VCC
U3 L1 1uH
CON1 DC IN
VCC
5 6 4
C11 C10 10uF
C9 10uF
C7 0.1uF
LX LX VIN
VOUT VOUT
VOUT
9 8 C8 2.2uF
C12 2.2uF
0.1uF D7
D6 ENM 11 ENF 10
VCC D1
D2
D3
D4
D2 D1
D5 7 13 3
R1 2.4K
R2 2.4K
R3 2.4K
RSETF RSETM
2 1
RSETF 13K RSETM 68K
IS31BL3233A
LED5
JP1 OPEN=EXT CTRL VCC
PGND AGND AGND
VOUT
VCCLDO
VOUT
2
C3 1uF
C4 0.1uF
3V ENF
4
1 2
GND 3
LDO 3V
6 7
R6 4.7K
K2
Bright-
K3
R9 4.7K
KEY4
Torch
R8 4.7K
KEY3
K1
KEY2
KEY1
Flash lamp
R7 4.7K
VCC
U2 C2 10nF
BP
TP3
5
SD
VOUT
2 1 3V
VDD
3
D9
D8
14 12
U1 1
C1 1uF
R5 2.4K
LED4
LED3
LED2
LED1 VCCLDO
R4 2.4K
ENM ENF
Bright+
10 KEY1
9
KEY2
8
KEY3
19
ENM
20
K4
P0.0
VDD
P1.7
P1.5
P1.6
P0.3
P3.1
P0.4
P3.0
P0.5
P1.2
P0.6
P1.3
P0.7
P1.4
P1.0
P0.2
P1.1
P0.1
VSS
15 R10 NC
4 RST
R11 NC
TP4 18 KEY4
2 1
17
ENM ENF
16 LED1 R15 100K
14 LED2
R14 100K
13 LED3 12 LED4 11 LED5 5
3V P0.5 P0.4 RST GND
5 4 3 2 1 ICP
LPC922
Figure 2: IS31BL3233A Application Schematic
Integrated Silicon Solution, Inc. – www.issi.com Rev. A, 10/28/2014
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IS31BL3233A 2MHZ 1.5A FLASH/TORCH LED DRIVER BILL OF MATERIALS Name
Symbol
Description
Qty
Supplier
Part No.
LED Driver
U3
Torch and Flash LED driver
1
ISSI
IS31BL3233A
CPU
U2
Microcontroller
1
NXP
LPC922
LDO
U1
Low-dropout regulator
1
PAM
PAM3101
Inductor
L1
1.0uH,DCR48mohm,Isat3.6A
1
Sunlord
WPN252012H1R0MT
Diode
D1~D5
Diode, LED Blue, SMD
5
Everlight
EHP-C04/UT01-P01/TR
Diode
D7, D9
Diode, LED White, peek current 3A
2
Everlight
EHP-C04/NT01A-P01/ TR Bin3235
Capacitor
C1, C3,C11
CAP,1µF,50V,±10%,SMD
2
Yageo
CC0805KRX7R9BB105
Capacitor
C2
CAP,10nF,50V,±10%,SMD
1
Yageo
CC0603KRX7R9BB103
Capacitor
C6, C7,C10
CAP,0.1µF,50V,±10%,SMD
2
Yageo
CC0603KRX7R9BB104
Capacitor
C8
CAP,4.7µF,10V,±10%,SMD
1
Yageo
CC0805KRX7R6BB475
Capacitor
C9
CAP,10µF,10V,±10%,SMD
1
Yageo
CC0805KRX7R6BB106
Resistor
R1~R5
RES,2.4k,1/16W,±5%,SMD
5
Yageo
RC0603JR-072.4KL
Resistor
R6~R9
RES,4.7k,1/16W,±5%,SMD
4
Yageo
RC0603JR-074.7KL
Resistor
R14,R15
RES,100k,1/16W,±5%,SMD
2
Yageo
RC0603JR-07100KL
Resistor
RSETM
RES,68k,1/16W,±1%,SMD
1
Yageo
RC0603FR-0768KL
Resistor
RSETF
RES,13k,1/16W,±1%,SMD
1
Yageo
RC0603FR-0713KL
Resistor
R10,R11,D6,D8
Not connect
4
Connector
CON1
2.5mm DC connector
1
Button
Flash lamp, Torch, Bright-, Bright+
Button SMD
4
Bill of materials, refer to Figure 2 above.
Integrated Silicon Solution, Inc. – www.issi.com Rev. A, 10/28/2014
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IS31BL3233A 2MHZ 1.5A FLASH/TORCH LED DRIVER 0
0 2
1
2
1
2 3
1
1
2
0
1
2
1
2
1
2
0
0
Figure 3: Board Component Placement Guide - Top Layer
Figure 4: Board PCB Layout - Top Layer
Integrated Silicon Solution, Inc. – www.issi.com Rev. A, 10/28/2014
4
IS31BL3233A 2MHZ 1.5A FLASH/TORCH LED DRIVER 0
0 2
1
2
1
2 3
1
1
2
0
1
2
1
2
1
2
0
0
Figure 5: Board Component Placement Guide - Bottom Layer
Figure 6: Board PCB Layout - Bottom Layer
Copyright © 2014 Integrated Silicon Solution, Inc. All rights reserved. ISSI reserves the right to make changes to this specification and its products at any time without notice. ISSI assumes no liability arising out of the application or use of any information, products or services described herein. Customers are advised to obtain the latest version of this device specification before relying on any published information and before placing orders for products. Integrated Silicon Solution, Inc. does not recommend the use of any of its products in life support applications where the failure or malfunction of the product can reasonably be expected to cause failure of the life support system or to significantly affect its safety or effectiveness. Products are not authorized for use in such applications unless Integrated Silicon Solution, Inc. receives written assurance to its satisfaction, that: a.) the risk of injury or damage has been minimized; b.) the user assume all such risks; and c.) potential liability of Integrated Silicon Solution, Inc is adequately protected under the circumstances
Integrated Silicon Solution, Inc. – www.issi.com Rev. A, 10/28/2014
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