SG684965DZ Fairchild Semiconductor, SG684965DZ Datasheet

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SG684965DZ

Manufacturer Part Number
SG684965DZ
Description
IC CTRLR PWM OTP UVLO CV/CC 8DIP
Manufacturer
Fairchild Semiconductor
Datasheet

Specifications of SG684965DZ

Output Isolation
Isolated
Frequency Range
60 ~ 70kHz
Voltage - Input
8 ~ 25 V
Voltage - Output
16.7V
Operating Temperature
-40°C ~ 125°C
Package / Case
8-DIP (0.300", 7.62mm)
Number Of Outputs
1
Duty Cycle (max)
80 %
Mounting Style
Through Hole
Switching Frequency
70 KHz
Maximum Operating Temperature
+ 105 C
Minimum Operating Temperature
- 40 C
Synchronous Pin
No
Topology
Flyback
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
© 2008 Fairchild Semiconductor Corporation
SG6849 Rev. 1.6.1
SG6849
Low-Power, Green-Mode PWM Flyback Power Controller
without Secondary Feedback
Features
Applications
Low-power, flyback power converters, such as:
Linearly Decreasing PWM Frequency
Green-Mode Under Light-Load and Zero-Load
Constant Voltage (CV) and Constant Current (CC)
No Secondary Feedback
Low Startup Current: 5μA
Low Operating Current: 3.6mA
Leading-Edge Blanking (LEB)
Constant Power Limit
Universal AC Input Range
Synchronized Slope Compensation
150°C OTP Sensor with Hysteresis
V
Cycle-by-Cycle Current Limiting
Under-Voltage Lockout (UVLO)
Fixed PWM Frequency: 65kHz
Gate Output Maximum Voltage Clamped at 16.7V
Small SSOT-6 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
Conditions
DD
Over-Voltage Clamping
Description
This highly integrated PWM controller provides several
features to enhance the performance of low-power
flyback
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
compensation to regulate the output voltage without
requiring a conventional TL431 and a photo-coupler. An
advantage of the SG6849 is a typical startup current of
only 5µA, while the typical operating current can be as
low as 3.6mA. A large startup resistance can be used to
achieve even higher power conversion efficiency.
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
The SG6849 provides many protection functions. Pulse-
by-pulse current limiting ensures a constant output
current, even if a short circuit occurs. 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 150°C with a 20°C hysteresis.
The SG6849 is designed to provide a low-cost total
solution for flyback converters. It is available in a small
footprint, 6-pin, SSOT-6 package.
Related Resources
AN-6849 - Low Cost, Green-Mode PWM Controller
for Flyback Converters
AC
converters.
to 264V
AC
.
To
DD
is also used for feedback
minimize
standby
December 2008
www.fairchildsemi.com
DD
exceeds
power

Related parts for SG684965DZ

SG684965DZ Summary of contents

Page 1

... 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 © 2008 Fairchild Semiconductor Corporation SG6849 Rev. 1.6.1 Description This highly integrated PWM controller provides several features to enhance the performance of low-power flyback converters ...

Page 2

... Ordering Information Part Operating Number Temperature Range SG684965TZ -40°C to +105°C SG684965DZ -40°C to +105°C SG684965DY -40°C to +105°C For Fairchild’s definition of “green” Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html. Application Diagram Internal Block Diagram GND 8(1) Internal Supply VDD ...

Page 3

... Marking Information *Marking for SG684965TZ (Pb-free) *Marking for SG684965DZ (Pb-free) *Marking for SG684965DY (Green Compound) © 2008 Fairchild Semiconductor Corporation SG6849 Rev. 1.6.1 XX: BB=SG6849-65T TT : Die Run Code . . . : Year Code - - - : Week Code T: D=DIP P: Z= Lead free + RoHS Compatible Null=Regular Package XXXXXXXX: Wafer Lot ...

Page 4

... GND © 2008 Fairchild Semiconductor Corporation SG6849 Rev. 1.6.1 Description The totem-pole output driver for driving the power MOSFET. Power supply. No connection. Current sense. It senses the voltage across a sensed resistor. To provide over- current protection, PWM output is disabled if the voltage exceeds an internal threshold ...

Page 5

... Machine Model, JEDEC:JESD22-C101 Notes: 1. All voltage values, except differential voltages, are given with respect to GND pin. 2. Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. © 2008 Fairchild Semiconductor Corporation SG6849 Rev. 1.6.1 Parameter (1, 2) SSOT DIP 5 Min ...

Page 6

... FB-OPEN Z Input Impedance Feedback Threshold Voltage* DD-FB DD Current-Sense Section t Delay to Output PD V Valley Threshold Voltage for Current Limit STHVA t Leading-Edge Blanking Time LEB © 2008 Fairchild Semiconductor Corporation SG6849 Rev. 1.6.1 =25°C. A Conditions V =15V DD V =15V, C =1nF =10mA DD I =0.1mA to 0.2mA FB ...

Page 7

... Rising Time r t Falling Time f V GATE- Output Clamp Voltage CLAMP Over-Temperature Protection (OTP) T Protection Junction Temperature OTP T OTP- Restart Junction Temperature RESTART © 2008 Fairchild Semiconductor Corporation SG6849 Rev. 1.6.1 (Continued) =25°C. A Conditions Deviation V =10 to 20V =15V, I =10mA =15V, I =10mA ...

Page 8

... Temperature (°C) Figure 9. Startup Current (I 70.0 65.0 60.0 55.0 50.0 -40 -25 - Temperature (°C) Figure 11. Center Frequency (f © 2008 Fairchild Semiconductor Corporation SG6849 Rev. 1.6 110 125 ) Figure 8. Turn-off Threshold Voltage (V DD- 110 125 ) vs. Temperature Figure 10. Center Frequency (f DD- 110 125 ) vs ...

Page 9

... Temperature (°C) Figure 15. Output Voltage Low (V vs. Temperature 1.00 0.90 0.80 0.70 0.60 0. Figure 17. Valley Threshold Voltage (V Figure 19. V © 2008 Fairchild Semiconductor Corporation SG6849 Rev. 1.6.1 (Continued) 0.80 0.78 0.76 0.74 0.72 0. 100 125 ) Figure 14. Valley Threshold Voltage ( 110 125 ) Figure 16 ...

Page 10

... PWM controller is shut down immediately. This situation continues until the temperature drops below 130°C. The PWM output then turns back on. The temperature hysteresis window for the OTP circuit is 20°C. © 2008 Fairchild Semiconductor Corporation SG6849 Rev. 1.6.1 V Over-Voltage Clamping ...

Page 11

... SG6849 with every switching cycle. The slope of the ramp is: 0.36 × Duty Duty(max.) © 2008 Fairchild Semiconductor Corporation SG6849 Rev. 1.6.1 Noise Immunity Noise from the current sense or the control signal may cause significant pulse width jitter, particularly in continuous-conduction mode ...

Page 12

... CY1 (Option) YC 102pF/400V (Y1 0.01μF/500V C2 EC 10μF/400V 105º 1000pF/500V C4 EC 10μF/50V C7 (Option) CC 102pF/100V 1206 C8 EC 470μF/10V 105º 220μF/10V 105ºC D1 Diode FRI07 D2 Diode FR102 D4 Diode SB360 D5 (Option) ZD 6.8V/0.5W © 2008 Fairchild Semiconductor Corporation SG6849 Rev. 1.6 VDD ...

Page 13

... EC 10μF50V C6 CC 472p/0805 C7 CC 102p/100V 1206 C8 EC 470μF10V 105º 470μF10V 105ºC C10 CC 222p/0805 D1 Diode FR107 D2 Diode FR102 D4 Diode SB360 D5 (Option) ZD 6.8V/0. 1Ω/0.5W Resistor L1 Inductor 20mH 6*8mm © 2008 Fairchild Semiconductor Corporation SG6849 Rev. 1.6.1 (Continued ...

Page 14

... Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner without notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor representative to verify or obtain the most recent revision. Package specifications do not expand the terms of Fairchild’s worldwide terms and conditions, specifically the warranty therein, which covers Fairchild products. Always visit Fairchild Semiconductor’ ...

Page 15

... Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner without notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor representative to verify or obtain the most recent revision. Package specifications do not expand the terms of Fairchild’s worldwide terms and conditions, specifically the warranty therein, which covers Fairchild products. Always visit Fairchild Semiconductor’ ...

Page 16

... Fairchild Semiconductor Corporation SG6849 Rev. 1.6.1 16 www.fairchildsemi.com ...

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