SEAWARD SE3901

Description
Features
The SE3901 is a green-mode Pulse Width Modulation
¾
Internal Zener Diode
(PWM) controller. It is specifically designed for low
¾
Low Cost Emitter Drive PWM Solution
power applications such as 5W-20W Adaptors and
¾
0.13W Standby Power
Off-line
typical
¾
Current Mode Operation
applications, the low standby power, space saving,
¾
Short Circuit Protection
and low cost are all required. SE3901 is a perfect
¾
Over-Current Protection
solutions to meet these challenges. The typical
¾
Over-Temperature Protection
standby power is only 0.13Watt.
¾
Under-Voltage Lockout with Auto-restart
In normal operation, the SE3901 switches on and off
¾
Available in TO-94 Packages
at a fixed switching frequency of 60 kHz. With a
¾
RoHS Compliant and 100% Lead (Pb)-Free
battery
Chargers.
In
these
current limit capability of about 420mA, the SE3901
can directly drive the emitter of a high voltage NPN
transistor. When the output power falls below a given
level, the IC enters skip cycle mode to reduce power
Application
consumption.
¾
Battery Chargers
The SE3901 also features Under-Voltage Lockout ,
¾
Universal Off-line Power Supplies
Over-Temperature
¾
Power Adaptors
¾
LED 3W-9W Lighting Solutions with SE1051
Protection,
Over-Current
and
Short Circuit Protections.
The SE3901 is available in TO-94 Packages.
Pin Configuration
TO-94
TOP VIEW
ZENER
OUT
GND
Vcc
Pin Description
Name
Pin#
Function
VCC
1
The power supply of the IC, and is generally connected to opto-coupler's emitter
GND
2
Supply ground
OUT
3
The output pin, connected to the emitter of NPN transistor.
ZENER
4
The output pin, connected to Internal ZENER
Revision 1/20/2009
Preliminary and all contents are subject to change without prior notice.
© Seaward Electronics, Inc., 2008. • www.seawardinc.com • Page 1
Absolute Maximum Rating
Symbol
Parameter
Maximum
Units
VCC
DC Supply Voltage
-0.3 ~ 6
V
OUT
Voltage at OUT
-0.3~ 18
V
220
°C/W
0 to 125
°C
θJA
TJ
Thermal Resistance Junction to Ambient (TO92)
Operating Junction Temperature Range
TSTG
Storage Temperature Range
TLEAD
Lead Temperature (Soldering 10 Sec)
-40 to 150
°C
260
°C
Electrical Characteristics
(Vcc=4V, TJ=25℃,unless otherwise specified)
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
VTH (ST)
5.00
5.25
5.5
V
VOPR (Min)
3.4
3.65
3.9
V
UVLO SECTION
Start-up Voltage
Minimal Operating
Voltage
THERMAL PROTECT
Thermal Shutdown
TSD
150
℃
Thermal Hysteresis
THy
20
℃
STANDBY CURRENT SECTION
IST
Start-up Current
Vcc=4V
ICC(OPR)
Operating Current
VCC Zener Voltage
Vz
ICC =10mA
Dynamic Impedance
RVCC
Vcc=3.8 to 4.8V
6
0.22
0.4
mA
0.45
0.7
mA
6.3
V
9
KΩ
INTERNAL OSCILLATOR
Switching Frequency
f
50
60
75
KHz
VST
8.5
11
V
VSC
6
V
VOPR (Min)+0.2
75
%
Vcc=Vth(st)-0.2
3
%
3
Ω
DRIVE OUTPUT SECTION
OUT Start-up Voltage
Short Circuit
Threashold Voltage
Maximum Duty Cycle
Dmax
Minimum Duty Cycle
Driver OUT
On-Resistance
ROUT
Switch Off Current
Effective Current Limit
OUT Current
Coefficient
IOUT =0.06A
Driver off, Vout=10V
ILIM
GA
Vcc=
VOPR +0.1V
20
420
40
uA
mA
-0.3
Revision 1/20/2009
Preliminary and all contents are subject to change without prior notice.
© Seaward Electronics, Inc., 2008. • www.seawardinc.com • Page 2
A/V
Typical Application
1
220V
R1 10/1W
1N4007
2
4
R2
100K 1/2W
1.5M 1/4W
3
Brid g e D1-D4
R3
220V
Port
C12
2.2uF
5V/1A
D8 SB240
C10
D5
220uF/15V
1N4007
C8
D7
1N4148
C10
4.7uF/15V
C9
R9
100
222M 400V
R11
10.7K
R5
4.7
U2
R8
2K
Q1
D6
C12
1N4818
104
13003
R4
U3
400
SE431
R6
200
Z
C4
10uF
SE3901
OUT
GND
R10
10K
Vcc
3.3n
C5
C6
10uF
U1
Fig.1 5V/1A Mobile Phone USB Charger Using SE3901(TO94) and SE431.
Revision 1/20/2009
Preliminary and all contents are subject to change without prior notice.
© Seaward Electronics, Inc., 2008. • www.seawardinc.com • Page 3
Port
1
220V
R1 10/1W
1N4007
2
4
R2
100K 1/2W
1.5M 1/4W
3
Brid g e D1-D4
R3
220V
C12
2.2uF
12V/700mA
D8 SB240
C10
D5
220uF/15V
1N4007
C8
D7
1N4148
C10
4.7uF/15V
C9
222M 400V
R5
4.7
U2
R10
0.8K
Q1
D6
1N4818
R11
100
13003
R8
2K
400
R6
200
SE3901
OUT
C4
10uF
GND
U1
R12
22K
224
C13
R13
R4
Z
R17
89K
C12
470K
104
Vctrl
Vcc
R15
10K
Vout Vsense
Vcc
3.3n
C5
C6
10uF
GND
Ictrl
R14
1K
U3 SE1051
0.34ohm
R16
Fig.2 12V/700mA Lighting 9W LED Solution Using SE3901(TO94) and SE1051.
Revision 1/20/2009
Preliminary and all contents are subject to change without prior notice.
© Seaward Electronics, Inc., 2008. • www.seawardinc.com • Page 4
1
220V
R1 10/1W
1N4007
2
4
R2
100K 1/2W
1.5M 1/4W
3
Brid g e D1-D4
R3
220V
C12
2.2uF
8.4V/2A
D8 SB240
C10
D5
220uF/15V
1N4007
C8
D7
1N4148
C10
4.7uF/15V
R18
1K
C9
222M 400V
C12
R12
22K
R5
4.7
U2
R10
0.8K
224
C13
R13
470K
BAT1
R17
60K
104
Q1
D6
1N4818
BAT2
R11
100
LED-R
LED-G
13003
R4
R8
2K
400
R6
200
Z
C4
10uF
SE3901
OUT
GND
U1
Red Green
Vcc
Vctrl
R15
10K
Vout Vsense
Vcc
3.3n
C5
C6
10uF
Ictrl
GND
R14
1K
0.05ohm
R16
Fig.3 8.4V/1A 2 Cell Batteries Charger, using SE3901(TO94) and SE1052.
Note: SE1052 integrates Voltage reference, Voltage setting and Current setting and LED drivers all in the
same IC. When the charging is on-going, the Red LED is On and the Green LED is Off. When the
Charging is completed, the Green LED is On and the Red LED is Off. The charging current can be
programmed by setting the R16 to the proper value. Please refer to SE1052 datasheet for details.
Revision 1/20/2009
Preliminary and all contents are subject to change without prior notice.
© Seaward Electronics, Inc., 2008. • www.seawardinc.com • Page 5
OUTLINE DRAWING TO94
Revision 1/20/2009
Preliminary and all contents are subject to change without prior notice.
© Seaward Electronics, Inc., 2008. • www.seawardinc.com • Page 6
OUTLINE DRAWING SOT143
Revision 1/20/2009
Preliminary and all contents are subject to change without prior notice.
© Seaward Electronics, Inc., 2008. • www.seawardinc.com • Page 7
Customer Support
Seaward Electronics Incorporated – China
Section B, 2nd Floor, ShangDi Scientific Office Complex, #22 XinXi Road
Haidian District, Beijing 100085, China
Tel: 86-10-8289-5700/01/05
Fax: 86-10-8289-5706
Seaward Electronics Corporation – Taiwan
2F, #181, Sec. 3, Minquan East Rd,
Taipei, Taiwan R.O.C
Tel: 886-2-2712-0307
Fax: 886-2-2712-0191
Seaward Electronics Incorporated – North America
1512 Centre Pointe Dr.
Milpitas, CA95035, USA
Tel: 1-408-821-6600
Last Updated - 1/20/2009
Revision 1/20/2009
Preliminary and all contents are subject to change without prior notice.
© Seaward Electronics, Inc., 2008. • www.seawardinc.com • Page 8