SE1051 Datasheet, PDF (1/6 Pages) Seaward Electronics Inc. – Constant Voltage and Constant Current Controller

Description
SE1051 is a highly integrated solution for SMPS
applications requiring CV (constant voltage) and CC
(constant current) modes.
SE1051 integrates one voltage reference, two
operational amplifiers (the outputs are OR’ed
together, common collectors), and a current
sensing circuit.
The voltage reference, together with one
operational amplifier, makes it an ideal voltage
controller. The other low voltage reference,
together with another operational amplifier, makes it
an ideal current limiter for low side output current
sensing. The current threshold is fixed, and precise.
The SE1051, housed in space-saving SOT23-6L
package, is ideal for space sensitive applications
such as adapters, cellphone chargers, Digital
Camera chargers, and other battery chargers.
Pin Configuration
Features
¾ Constant Voltage and Constant Current Control
¾ Low Voltage Operation at 3V
¾ Precision Internal Voltage Reference
¾ Low External Component Count
¾ Current Sink Output Stage
¾ Easy Compensation
¾ Low AC Mains Voltage Rejection
¾ Rugged 2KV ESD withstand capability.
¾ Available in SOT-23-6L Package.
¾ RoHS Compliant and 100% Lead (Pb)-Free
Application
¾ Adapters
¾ Digital Camera Chargers.
¾ Cellphone Chargers.
¾ Other Battery Chargers
Ordering Information/Making Information
Device
Package
V_OUT
SE1051
SOT-23-6L
(Lead-free)
Fixed output voltages
1.21V
Package
Making Information
PIN1 is down in the left-hand corner.
The last character is the batch
number.
A dot on top right corner is for
lead-free process.
Pin Description
Name Pin# Type
Function
V_CTRL
1
Analog Input
Input Pin of the Voltage Control Loop
GND
2
Power Supply
Ground Line. 0V Reference For All Voltages
V_OUT
3
Current Sink Output Output Pin. Sinking Current Only
I_CTRL
4
Analog Input
Input Pin of the Current Control Loop
V_SENSE
5
Analog Input
Input Pin of the Current Control Loop
V_CC
6
Power Supply
Positive Power Supply Line
Revision 12/4/2008
Preliminary and all contents are subject to change without prior notice.
© Seaward Electronics, Inc., 2006. • www.seawardinc.com.cn • Page 1