SGP400TZ Fairchild Semiconductor, SGP400TZ Datasheet

IC CTRLR PWM GREEN CM OTP SSOT6

SGP400TZ

Manufacturer Part Number
SGP400TZ
Description
IC CTRLR PWM GREEN CM OTP SSOT6
Manufacturer
Fairchild Semiconductor
Datasheet
1.SGP400TZ.pdf (15 pages)

Specifications of SGP400TZ

Output Isolation
Isolated
Frequency Range
62 ~ 68kHz
Voltage - Input
8 ~ 30 V
Voltage - Output
18V
Power (watts)
247mW
Operating Temperature
-40°C ~ 125°C
Package / Case
6-SSOT, SuperSOT™-6
Output Voltage
1.5 V to 8 V
Input Voltage
0.3 V to 7 V
Switching Frequency
68 KHz
Operating Temperature Range
- 20 C to + 85 C
Mounting Style
SMD/SMT
Duty Cycle (max)
80 %
Number Of Outputs
1
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Low-Power Green-Mode PWM Flyback Power Controller without Secondary Feedback
FEATURES
APPLICATIONS
Low-power flyback power converters, such as:
TYPICAL APPLICATION
© System General Corp.
Version 1.0.1 (IAO33.0084.B0)
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
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
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
DD
over-voltage clamping
C
R
IN
IN
V
IN
V D D
GN D
SE N SE
G ATE
D
1
Q 1
R
- 1 -
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
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
current-mode control. Proprietary internal compensation
ensures constant output power limiting over a universal
range of AC input voltages, from 90V
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
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.
S
W
A U X
www.sg.com.tw • www.fairchildsemi.com
maintains
D
O
C
O
the
Product Specification
V
O
stability
September 24, 2007
DD
, is also used for
AC
to 264V
DD
SGP400
of
exceeds
peak
AC
.

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SGP400TZ Summary of contents

Page 1

Low-Power Green-Mode PWM Flyback Power Controller without Secondary Feedback 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 ...

Page 2

... W: Week code A~Z=W1~W26 D: D=DIP P: Z=Lead free Null=Regular package SGP400DP XXXXXXXX: Wafer Lot XXXXXXXXYWWV Y: Year WW: Week V: Assembly Location ORDERING INFORMATION Part Number PWM Frequency SGP400TZ 65KHz SGP400DZ 65KHz PIN DESCRIPTIONS Pin No. Name Type DIP-8 SOT-26 GATE 1 6 Driver Output The totem-pole output driver to drive the power MOSFET. ...

Page 3

Low-Power Green-Mode PWM Flyback Power Controller without Secondary Feedback BLOCK DIAGRAM © System General Corp. Version 1.0.1 (IAO33.0084.B0) Product Specification - 3 - www.sg.com.tw • www.fairchildsemi.com SGP400 September 24, 2007 ...

Page 4

Low-Power Green-Mode PWM Flyback Power Controller without Secondary Feedback ABSOLUTE MAXIMUM RATINGS Symbol Parameter V DC Supply Voltage* VDD V FB Pin Input Voltage FB V Sense Pin Input Voltage SENSE P Power Dissipation (T =85° Thermal ...

Page 5

Low-Power Green-Mode PWM Flyback Power Controller without Secondary Feedback Current Sense Section Symbol Parameter t Propagation Delay PD V Current Limiting Valley Threshold Voltage STHVA V Current Limiting Flat Threshold Voltage STHFL t Leading-Edge Blanking Time LEB V Ramp LIMIT ...

Page 6

Low-Power Green-Mode PWM Flyback Power Controller without Secondary Feedback Output Section Symbol Parameter DCY Maximum Duty Cycle MAX V GATE Low Voltage GATE-L V GATE High Voltage GATE-H tr GATE Rising Time tf GATE Falling Time V GATE Output Clamping ...

Page 7

Low-Power Green-Mode PWM Flyback Power Controller without Secondary Feedback TYPICAL CHARACTERISTICS Turn-On Threashold Voltage ( Temperature DD-ON 18.0 17.5 17.0 16.5 16.0 -40 -25 - Temperature (℃) Startup Current ( ...

Page 8

Low-Power Green-Mode PWM Flyback Power Controller without Secondary Feedback Frequency ( Temperature OSC -40 -25 - Temperature (℃ Pin Input Voltage ( Temperature FB ...

Page 9

Low-Power Green-Mode PWM Flyback Power Controller without Secondary Feedback OPERATION DESCRIPTION SGP400 devices integrate many useful functions for low-power switch-mode power supplies. The following descriptions highlight key features of the SGP400. Start-up Current The required start-up current is only 8µA, ...

Page 10

Low-Power Green-Mode PWM Flyback Power Controller without Secondary Feedback Constant Output Power Limit When the SENSE voltage across the sense resistor, R reaches the threshold voltage (around 1.0V), the output GATE drive is turned off after a small propagation delay ...

Page 11

Low-Power Green-Mode PWM Flyback Power Controller without Secondary Feedback REFERENCE CIRCUIT 3W Flyback 5V/0.6A Circuit, without Secondary-Side Feedback BD1 CX1 GND GATE VDD 3 ...

Page 12

Low-Power Green-Mode PWM Flyback Power Controller without Secondary Feedback 3W Flyback 5V/0.6A Circuit, with Secondary-Side Feedback BD1 + SG6849 1 6 GND GATE VDD 3 4 ...

Page 13

Low-Power Green-Mode PWM Flyback Power Controller without Secondary Feedback PACKAGE INFORMATION 6 PINS-SOT ( Dimensions: Millimeters Symbol Min 0.90 b 0. 0.10 ...

Page 14

Low-Power Green-Mode PWM Flyback Power Controller without Secondary Feedback 8 PINS-DIP ( Dimensions: Millimeter Symbol Min 0.381 A2 3.175 9.017 E E1 6.223 e L 2.921 e 8.509 ...

Page 15

Low-Power Green-Mode PWM Flyback Power Controller without Secondary Feedback © System General Corp. Version 1.0.1 (IAO33.0084.B0) Product Specification - 15 - www.sg.com.tw • www.fairchildsemi.com SGP400 September 24, 2007 ...

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