Solved by
SP7120/22
TM
Evaluation Board Manual
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LED Driver for common cathode parallel
connected LEDs
Ultra Low Dropout Voltage of 150mV
No EMI, no switching noise
Integrated current matching
PWM and Analog brightness control
Enable/Shutdown control
Shutdown current < 1µA
Small footprint SOT23-6 Package
_______________________________________________________________ DESCRIPTION
The SP712X driver’s family provides a simple solution for a matched current source for any
color common cathode LEDs. The common cathode connection allows the user to increase the
led power dissipation by having the cathodes heat sinked to the ground plane of the circuit
board. The SP7120 may drive two LEDs or one LED at twice the current with two channels
connected in parallel. The factory preset current values of 15mA (version A), 20mA (version B),
or 25mA (version C) per channel. The SP7122 has three channels with factory preset current
values of 15, 20, or 25mA and may drive three LEDs or one LED at three-times the current with
all channels connected in parallel. At shutdown mode (EN pin is LOW) the supply current drops
to .04uA typical.
The SP712x drivers are available in a small footprint 6-pin SOT23-6 package.
__________________________________________________________ BOARD SCHEMATIC
SP7120 Eval Board Schematic
July19-07
SP7120-22 Evaluation Board Manual
© 2007 Sipex Corporation
SP7122 Eval Board Schematic
_______________________________________________ USING THE EVALUATION BOARD
1) Powering Up the SP7120 or the SP7122 Circuit
The Evaluation Board can be powered from inputs ranging from 2.7 to 5.5Vin. All that is required
is to populate the LED location with desired LED and connect the source voltage to Vin and
GND. There is a jumper located on the PCB. The jumper needs to be set between center pin
and Vin to activate the part. If the jumper is left unpopulated the driver will be off due to the pull
down resistor on the enable pin.
For typical test results please refer to the data sheet.
_________________________________________________ EVALUATION BOARD LAYOUT
TOP Side SP7120
TOP Side SP7122
TOP Side SP7122
July9-07
TOP Side SP7122
© 2007 Sipex Corporation
SP7120-22 Evaluation Board Manual
Page - 2 -
__________________________________________________________ BILL OF MATERIALS
SP7120
QTY
1
2
1
1
1
3
1
Ref
Desigantor
U1
C1
R1
J1
Manufacturer
Sipex
Murata
Vishay
Wurth
Wurth
Millmax(DigiKey)
Sipex
Part Number
SP7120***
GRM188R71H102KA01
CRCW060380K6FKEA
61303611121
60900213421
0300-11501-4727100
146-6643-01
Description
1nF Capacitor
80.6K Resistor
3 Pin 2.54 mm
Header
2.54mm
Jumper
Test point pin
PCB
***EACH PCB WILL HAVE A STICKER ON IT IDENTIFYING THE WHICH VERSION IC
IS ON THE DEMO BOARD
SP7122
QTY
Ref
Manufacturer
Part Number
Description
Desigantor
1
U1
Sipex
SP7122***
2
C1
Murata
GRM188R71H102KA01
1nF Capacitor
1
R1
Vishay
CRCW060380K6FKEA
80.6K Resistor
1
J1
Wurth
61303611121
3 Pin 2.54 mm
Header
1
Wurth
60900213421
2.54mm
Jumper
3
Millmax(DigiKey)
0300-11501-4727100
Test point pin
1
Sipex
146-6645-00
PCB
***EACH PCB WILL HAVE A STICKER ON IT IDENTIFYING THE WHICH VERSION IC
IS ON THE DEMO BOARD
July9-07
SP7120-22 Evaluation Board Manual
© 2007 Sipex Corporation
Page - 3 -
_____________________________________________________ ORDERING INFORMATION
Part Number
SP7120AEB
SP7120BEB
SP7120CEB
SP7122AEB
SP7122BEB
SP7122CEB
Description
SP7120A 2 channel (15mA) Eval Board
SP7120B 2 channel(20mA) Eval Board
SP7120C 2 channel(25mA) Eval Board
SP7122A 3 channel(15mA) Eval Board
SP7122B 3 channel (20mA) Eval Board
SP7122C 3 channel (25mA) Eval Board
For further assistance:
Email:
WWW Support page:
Sipex Application Notes:
Sipexsupport@sipex.com
http://www.sipex.com/content.aspx?p=support
http://www.sipex.com/applicationNotes.aspx
Solved by
TM
Sipex Corporation
Headquarters and
Sales Office
233 South Hillview Drive
Milpitas, CA95035
tel: (408) 934-7500
fax: (408) 935-7600
Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume
any liability arising out of the application or use of any product or circuit described herein; neither does it convey
any license under its patent rights nor the rights of others.
July9-07
SP7120-22 Evaluation Board Manual
© 2007 Sipex Corporation
Page - 4 -