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Product Specification
Low-Power Green-Mode PWM Flyback Power Controller without Secondary Feedback
SGP400
FEATURES
Linearly decreasing PWM frequency
Green-mode under light-load and zero-load
conditions
Constant voltage (CV) and constant current (CC)
No secondary feedback
Low start-up current (8µA)
Low operating current (3.6mA)
Leading-edge blanking
Constant power limit
Universal AC input range
Synchronized slope compensation
140°C OTP sensor with hysteresis
V
DD
over-voltage clamping
Cycle-by-cycle current limiting
Under-voltage lockout (UVLO)
Fixed PWM frequency with hopping
Gate output maximum voltage clamped at 17V
Small SOT-26 package
DESCRIPTION
This highly integrated PWM controller provides several
features to enhance the performance of low-power
flyback converters. To minimize standby power
consumption, the proprietary green-mode function
provides off-time modulation to linearly decrease the
switching frequency under light-load and zero-load
conditions. This green-mode function enables the power
supply to meet international power conservation
requirements. The supply voltage, V
DD
, is also used for
feedback compensation, to regulate the output voltage
without requiring a conventional TL431 and a
photo-coupler. The typical start-up current is only 8µA,
while the typical operating current can be as low as
3.6mA. A large start-up resistance could be used to
achieve even higher power conversion efficiency.
SGP400 integrates a frequency hopping function, which
helps reduce EMI emission of a power supply with
minimum line filters. Built-in synchronized slope
compensation maintains the stability of peak
current-mode control. Proprietary internal compensation
ensures constant output power limiting over a universal
range of AC input voltages, from 90V
AC
to 264V
AC
.
Pulse-by-pulse current limiting ensures a constant output
current, even if a short-circuit occurs. Also, the internal
protection circuit disables PWM output if V
DD
exceeds
22.7V. The gate output is clamped at 16.7V to protect the
power MOS from over-voltage damage. The built-in
over temperature protection (OTP) function shuts down
the controller at 140°C with a 30°C hysteresis. The
SGP400, designed to provide a low-cost total solution for
flyback converters, is available in a small footprint, 6-pin,
SOT-26 package.
APPLICATIONS
Low-power flyback power converters, such as:
Battery chargers for cellular phones, cordless phones,
PDAs, digital cameras, and power tools
Power adapters for ink jet printers, video game
consoles, and portable audio players
Open-frame SMPS for TV/DVD standby and other
auxiliary supplies, home appliances, consumer
electronics, and PC 5V standby-power
Replacements for linear transformers and
RCC SMPS
TYPICAL APPLICATION
V
IN
R
IN
D
1
W
AUX
D
O
C
O
V
O
VDD
G ATE
Q1
C
IN
SE N SE
GN D
R
S
© System General Corp.
Version 1.0.1 (IAO33.0084.B0)
-1-
www.sg.com.tw • www.fairchildsemi.com
September 24, 2007
Product Specification
Low-Power Green-Mode PWM Flyback Power Controller without Secondary Feedback
SGP400
MARKING INFORMATION
XXX:
AAK=SGP400;
: Lead Free
M:
Mask Version
W:
Week code A~Z=W1~W26
A~Z=W27~W52
PIN CONFIGURATION
SOT-26
GND
FB
N.C.
GATE
VDD
SENSE
XXXMW
SGP400DP
XXXXXXXXYWWV
D:
D=DIP
P:
Z=Lead free
Null=Regular package
XXXXXXXX:
Wafer Lot
Y:
Year
WW:
Week
V:
Assembly Location
DIP-8
GATE
VDD
N.C.
SENSE
GND
FB
N.C.
N.C.
ORDERING INFORMATION
Part Number
SGP400TZ
SGP400DZ
PWM Frequency
65KHz
65KHz
Pb-Free
Package
6-Pin SOT-26
8-Pin DIP-8
PIN DESCRIPTIONS
Name
GATE
VDD
NC
SENSE
NC
NC
FB
GND
Pin No.
DIP-8
1
2
3
4
5
6
7
8
SOT-26
6
5
NA
4
3
NA
2
1
Type
Function
Driver Output The totem-pole output driver to drive the power MOSFET.
Supply
Power supply.
NC pin.
Current sense. It senses the voltage across a sensed resistor. To provide over-current
Analog Input protection, PWM output is disabled if the voltage exceeds an internal threshold. This pin
also provides current information for current-mode control.
NC pin.
NC pin.
Feedback. The FB pin provides feedback information to the internal PWM comparator.
Analog Input This feedback is used to control the duty cycle. When no feedback is provided, this pin is
left open.
Supply
Ground.
© System General Corp.
Version 1.0.1 (IAO33.0084.B0)
-2-
www.sg.com.tw • www.fairchildsemi.com
September 24, 2007
Product Specification
Low-Power Green-Mode PWM Flyback Power Controller without Secondary Feedback
SGP400
BLOCK DIAGRAM
© System General Corp.
Version 1.0.1 (IAO33.0084.B0)
-3-
www.sg.com.tw • www.fairchildsemi.com
September 24, 2007
Product Specification
Low-Power Green-Mode PWM Flyback Power Controller without Secondary Feedback
SGP400
ABSOLUTE MAXIMUM RATINGS
Symbol
V
VDD
V
FB
V
SENSE
P
D
R
θJA
R
θJC
T
J
T
STG
T
L
ESD
Parameter
DC Supply Voltage*
FB Pin Input Voltage
Sense Pin Input Voltage
Power Dissipation (T
A
=85°C)
Thermal Resistance (Junction-to-Air)**
Thermal Resistance (Junction-to-Case)**
Operating Junction Temperature
Storage Temperature Range
Lead Temperature (Wave Soldering or Infrared, 10 Seconds)
Electrostatic Discharge Capability, Human Body Model
Electrostatic Discharge Capability, Machine Model
Value
30
-0.3 to 7.0
-0.3 to 7
SOT-26
DIP-8
SOT-26
DIP-8
SOT-26
DIP-8
-40 to +125
-55 to +150
260
4.0
200
247
478
263.3
135.7
119.6
67.1
Unit
V
V
V
mW
°C/W
°C/W
°C
°C
°C
KV
V
* All voltage values, except differential voltages, are given with respect to the network ground terminal.
* Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device.
** Thermal resistance •
JA
test board size: SOT 18×12×1.6mm/FR4; DIP 40×35×1.6mm/FR4.
RECOMMENDED OPERATING CONDITIONS
Symbol
V
DD
T
A
Parameter
DC Supply Voltage
Operating Ambient Temperature
With Secondary Feedback
Without Secondary Feedback
Value
<20
<22.7
-20 to +85
Unit
V
V
°C
* For proper operation.
ELECTRICAL CHARACTERISTICS (VDD=15V, T
A
=25°C, unless noted)
V
DD
Section
Symbol
V
DD-ON
V
DD-OFF
I
DD-ST
I
DD-OP
V
DD-G OFF
Parameter
Turn-On Threshold Voltage
Turn-Off Threshold Voltage
Start-up Current
Operating Supply Current
V
DD
Low-threshold Voltage to Exit Green-off Mode
Test Condition
Min.
16
7.5
Typ.
17
8.0
8
3.6
V
DD-OFF
+
1.2
Max.
18
8.5
20
4.6
Unit
V
V
µA
mA
V
V
DD
=V
DD-ON
-0.1V
V
DD
=15V, C
L
=1nF
Feedback Input Section
Symbol
A
V
V
FB-OPEN
Z
FB
V
DD-FB
Parameter
Input-Voltage to Current-Sense Attenuation
Open-Loop Voltage
Input Impedance
V
DD
Feedback Threshold Voltage*
Test Condition
Min.
4.5
Typ.
2/5
Max.
Unit
V/V
V
KΩ
I
FB
=0.1mA to 0.2mA
FB is Open
I
FB
=0.4mA
20.7
18.4
2.4
22.7
20.4
24.7
22.4
V
V
* The feedback input is pulled by a transistor controlled by the V
DD
signal while V
DD
≥
V
DDZ
.
© System General Corp.
Version 1.0.1 (IAO33.0084.B0)
-4-
www.sg.com.tw • www.fairchildsemi.com
September 24, 2007
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