IS31BL3232 FLASH LED DRIVER

IS31BL3232 FLASH LED DRIVER
DESCRIPTION
RECOMMENDED EQUIPMENT
The IS31BL3232 is a charge pump constant
current-regulated LED driver ideal for powering high
brightness LEDs for camera flash and torch
applications. The charge pump can be set to regulate
two current levels for Flash or Torch modes. The
IS31BL3232 automatically switches between linear
and boost modes; the charge pump will start up
automatically to offer a higher output voltage when VFB
is lower than the setting value. In the Flash Mode the
output will shut down automatically after 1s to save
energy.
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IS31BL3232 provides low cost, space saving solution
for driving LED. It also integrates thermal and short
circuit protection function.
FEATURES
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Operates from 2.7V to 5.5V
Up to 90% efficiency in Torch Mode
Output current up to 1.2A(1s) in Flash Mode
Adjustable output current in Flash Mode
Time out function with 1s for Flash Mode
Minimum external components, no external
inductor required
Automatic boost mode
Less than 1µA shutdown current
Low ripple and EMI
Over voltage protection on output
ESD HBM 8kV
Short and over temperature protections
Available in DFN-10 (3mm × 3mm) package
3.0V~5.0V, 2A power supply
ABSOLUTE MAXIMUM RATINGS

≤ 5.5V power supply
Caution: Do not exceed the conditions listed above, otherwise
the board will be damaged.
PROCEDURE
The IS31BL3232 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)
2)
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 1.5A,
please check for circuit fault.
EVALUATION BOARD OPERATION
The evaluation board is controlled by LPC922 (8051
core).
IS31BL3232 evaluation board demonstrates the Flash
and Torch modes by switching between modes when
the corresponding buttons are pressed.
1)
QUICK START
2)
Torch Mode (Default): The “Bright+” and
“Bright-” buttons are used to control the WLED
brightness. 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.
Flash Mode: Once pressed the white LEDs will
flash ON for one second.
SOFTWARE SUPPORT
Please refer to the integrated program.
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 TP3 connector to directly
control the IC’s EN and FLASH input pins.
Figure 1: Photo of IS31BL3232 Evaluation Board
Integrated Silicon Solution, Inc. – www.issi.com
Rev. A, 07/23/2013
Please refer to the datasheet to get more information about
IS31BL3232.
1
IS31BL3232 FLASH LED DRIVER
ORDERING INFORMATION
Part No.
Temperature Range
Package
IS31BL3232-DLS2-EB
-40°C ~ +85°C (Industrial)
DFN-10, 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.
U1
VCC
VDD
3
C1
1uF
U2
VCC_3V
1
VOUT
5
C2
10nF
SD
2
GND
BP
1
20
19
18
17
16
14
13
FLASH
EN
K3
K4
C3
1uF
4
P0.4
P0.5_LED1
LED2
LED3
LDO
JP1
VCC_3V
P0.0/CMP2/KBI0/AD01
P0.1/CIN2B/KBI1/AD10
P0.2/CIN2A/KBI2/AD11
P0.3/CIN1B/KBI3/AD12
P0.4/CIN1A/KBI4/DAC1/AD13
P0.5/CMPREF/KBI5
P0.6/CMP1/KBI6
P0.7/T1/KBI7
VDD
VCC_3V
15
C4
LED1
1k
LED2
VSS
0.1uF
5
R9
10k
K1
R10
10k
R11
10k
K2
R12
10k
K3
12
11
10
9
8
4
3
2
K4
P1.0/TXD
P1.1/RXD
P1.2/T0/SCL
P1.3/INT0/SDA
P1.4/INT1
P1.5/RST
P1.6/OCB
P1.7/OCC/AD00
torch
Bright+
Bright-
VCC_3V
P0.5
P0.4
RST
GND
5
4
3
2
1
LED4
P3.0XTAL2/CLKOUT
P3.1/XTAL1
LED5
1k
LED6
DC IN
VCC
1k
LED7
TP1
2
1
TP2
C8
10uF
FLASH
LED8
VCC
VOUT
D8
R8
0.1uF
4
5
R16 R17
91K 91K
C10
VOUT
10
C6
EN
R15
91k
D7
R7
1k
PGND
SGND
TP3
C5
10uF
D6
R6
U3
1
CON1
D5
R5
1k
VCC
R14
NC
D4
R4
1k
7
6
LPC922
ICP
R13
NC
D3
R3
1k
TP6
Flash lamp
D2
R2
1k
LED3
OPEN=EXT CTRL
LED4
LED5
LED6
K1
K2
RST
LED7
LED8
D1 VCC_3V
R1
FLASH
EN
FB
2
1uF
3
CP
RSET
9
8
R19
R20
NC
1ohm
D10
D11
7
FB
6
R18
CN
TP4
C7
C9
0.1uF 10uF
TP5
27k
IS31BL3232
Figure 2: IS31BL3232 Application Schematic
Integrated Silicon Solution, Inc. – www.issi.com
Rev. A, 07/23/2013
2
IS31BL3232 FLASH LED DRIVER
Bill of Materials
Name
Symbol
Description
Qty
Supplier
Part No.
LDO
U1
Low-dropout regulator
1
PAM
PAM3101
MCU
U2
Microcontroller
1
NXP
LPC922
LED Driver
U3
Torch and Flash LED driver
1
ISSI
IS31BL3232
Diode
D1~D8
Diode, LED Blue, SMD
8
Diode
D10~D11
Diode, LED White, peek current
500mA
2
OSRAM
LUW C9SN
Capacitors
C1, C3
CAP,1µF,16V,±20%,SMD
2
Capacitor
C2
CAP,10nF,16V,±20%,SMD
1
Capacitors
C4, C6, C7
CAP,0.1µF,16V,±20%,SMD
3
Capacitor
C5
CAP,10µF,10V,±20%,SMD
1
Capacitors
C8, C9
CAP,10µF,10V,±20%,SMD
2
Capacitor
C10
CAP,1µF,16V,±20%,SMD
1
Resistors
R1~R8
RES,1k,1/16W,±5%,SMD
8
Resistors
R9~R12
RES,10k,1/16W,±5%,SMD
4
Resistors
R15,R16, R17
RES,91k,1/16W,±5%,SMD
3
Resistor
R18
RES,27k,1/16W,±5%,SMD
1
Resistor
R20
RES,1R,1/16W,±5%,SMD
1
Resistors
R13,R14 ,R19
Not connect
3
Buttons
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, 07/23/2013
3
IS31BL3232 FLASH LED DRIVER
0
0
2
1
2
1
2
3
1
1
2
1
2
0
1
2
1
1
2
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, 07/23/2013
4
IS31BL3232 FLASH LED DRIVER
0
0
2
1
2
1
2
3
1
1
2
1
2
0
1
2
1
1
2
2
0
0
Figure 5: Board Component Placement Guide -Bottom Layer
Figure 6: Board PCB Layout-Bottom Layer
Copyright © 2013 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, 07/23/2013
5