SGP400DZ Fairchild Semiconductor, SGP400DZ Datasheet

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SGP400DZ

Manufacturer Part Number
SGP400DZ
Description
IC CTRLR PWM GREEN CM CV/CC 8DIP
Manufacturer
Fairchild Semiconductor
Datasheet
1.SGP400TZ.pdf (15 pages)

Specifications of SGP400DZ

Output Isolation
Isolated
Frequency Range
62 ~ 68kHz
Voltage - Input
8 ~ 30 V
Voltage - Output
18V
Power (watts)
478mW
Operating Temperature
-40°C ~ 125°C
Package / Case
8-DIP (0.300", 7.62mm)
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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SGP400DZ 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

... 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. VDD ...

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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