FSDH321_04 FAIRCHILD [Fairchild Semiconductor], FSDH321_04 Datasheet

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FSDH321_04

Manufacturer Part Number
FSDH321_04
Description
Green Mode Fairchild Power Switch
Manufacturer
FAIRCHILD [Fairchild Semiconductor]
Datasheet
1.FSDH321_04.pdf (20 pages)
Features
• Internal Avalanche Rugged Sense FET
• Consumes only 0.65W at 240VAC & 0.3W load with
• Frequency Modulation for low EMI
• Precision Fixed Operating Frequency
• Internal Start-up Circuit
• Pulse by Pulse Current Limiting
• Abnormal Over Current Protection
• Over Voltage Protection
• Over Load Protection
• Internal Thermal Shutdown Function
• Auto-Restart Mode
• Under Voltage Lockout
• Low Operating Current (max 3mA)
• Adjustable Peak Current Limit
• Built-in Soft Start
Applications
• SMPS for STB, Low cost DVD
• Auxiliary Power for PC
• Adaptor for Charger
Description
The FSDx321(x stands for H, L) are integrated Pulse Width
Modulators (PWM) and Sense FETs specifically designed
for high performance offline Switch Mode Power Supplies
(SMPS) with minimal external components. Both devices
are integrated high voltage power switching regulators
which combine an avalanche rugged Sense FET with a cur-
rent mode PWM control block. The integrated PWM con-
troller features include: a fixed oscillator with frequency
modulation for reduced EMI, Under Voltage Lock Out
(UVLO) protection, Leading Edge Blanking (LEB), opti-
mized gate turn-on/turn-off driver, Thermal Shut Down
(TSD) protection, Abnormal Over Current Protection
(AOCP) and temperature compensated precision current
sources for loop compensation and fault protection circuitry.
When compared to a discrete MOSFET and controller or
RCC switching converter solution, the FSDx321 reduce total
component count, design size, weight and at the same time
increase efficiency, productivity, and system reliability. Both
devices are a basic platform well suited for cost effective
designs of flyback converters.
©2004 Fairchild Semiconductor Corporation
FSDH321, FSDL321
Green Mode Fairchild Power Switch (FPS
Advanced Burst-Mode Operation
Table 1. Notes: 1. Typical continuous power in a non-ven-
tilated enclosed adapter measured at 50 C ambient. 2.
Maximum practical continuous power in an open frame
design at 50 C ambient. 3. 230 VAC or 100/115 VAC with
doubler.
Typical Circuit
FSDM0265RN
FSDM0365RN
FSDH0265RN
FSDM0265RL
FSDM0365RL
FSDL0165RN
FSDL0365RN
FSDH0265RL
FSDL0165RL
FSDL0365RL
AC
IN
PRODUCT
FSDH321L
FSDL321L
FSDH321
FSDL321
Figure 1. Typical Flyback Application
Ipk
OUTPUT POWER TABLE
Vfb
Vstr
Adapt-
230VAC 15%
PWM
13W
16W
16W
19W
19W
13W
16W
16W
19W
19W
11W
11W
11W
11W
er
(1)
Vcc
Drain
Frame
www.fairchildsemi.com
Open
Source
17W
17W
23W
27W
27W
30W
30W
17W
17W
23W
27W
27W
30W
30W
(3)
TM
(2)
Adapt-
)
11W
13W
13W
16W
16W
11W
13W
13W
16W
16W
er
8W
8W
8W
8W
85-265VAC
(1)
Rev.1.0.2
Frame
Open
12W
12W
17W
20W
20W
24W
24W
12W
12W
17W
20W
20W
24W
24W
OUT
DC
(2)

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FSDH321_04 Summary of contents

Page 1

FSDH321, FSDL321 Green Mode Fairchild Power Switch (FPS Features • Internal Avalanche Rugged Sense FET • Consumes only 0.65W at 240VAC & 0.3W load with Advanced Burst-Mode Operation • Frequency Modulation for low EMI • Precision Fixed Operating Frequency • ...

Page 2

FSDH321, FSDL321 Internal Block Diagram + V /V BURL BURH - V BURH Vcc Vcc I I delay 2. Vcc Vovp TSD 2 Vcc 2 Soft start 8V/12V Vcc good Vcc ...

Page 3

Pin Definitions Pin Number Pin Name 1 GND 2 Vcc 3 Vfb 4 Ipk 5 Vstr Drain Pin Configuration Pin Function Description Sense FET source terminal on primary side and internal control ground. Positive supply voltage input. ...

Page 4

FSDH321, FSDL321 Absolute Maximum Ratings (Ta=25 C, unless otherwise specified) Parameter Maximum Vstr Pin Voltage Maximum Drain Pin Voltage Drain-Gate Voltage (R = Gate-Source (GND) Voltage (1) Drain Current Pulsed Continuous Drain Current (Tc=25 C) Continuous Drain Current ...

Page 5

Electrical Characteristics (Sense FET Part) ( unless otherwise specified) Parameter Sense FET SECTION Drain-Source Breakdown Voltage Startup Voltage (Vstr) Breakdown Zero Gate Voltage Drain Current Static Drain-Source on Resistance (Note) (Note) Forward Trans conductance Input Capacitance Output ...

Page 6

FSDH321, FSDL321 Electrical Characteristics (Control Part) (Ta=25 C unless otherwise specified) Parameter UVLO SECTION Start Threshold Voltage Stop Threshold Voltage OSCILLATOR SECTION Initial Accuracy Frequency Modulation Initial Accuracy Frequency Modulation Frequency Change With Temperature Maximum Duty Cycle FEEDBACK SECTION Feedback ...

Page 7

Comparison Between FSDM311 and FSDx321 Function Soft-Start 15mS External Current Limit not applicable Frequency Modulation not applicable Burst Mode Operation Yes-built into controller Drain Creepage at 7.62mm Package FSDM311 FSDx321 15mS Programmable of default current limit ±1.5KHz @50KHz ±3.0KHz @100KHz ...

Page 8

FSDH321, FSDL321 Typical Performance Characteristics (Control Part) (These characteristic graphs are normalized 1.20 1.00 0.80 0.60 0.40 0.20 0.00 - emp[ ℃ ] Operating Frequency (Fosc) 1.20 1.00 0.80 0.60 0.40 0.20 0.00 -50 ...

Page 9

Typical Performance Characteristics 1.20 1.00 0.80 0.60 0.40 0.20 0.00 - emp[ ℃ ] Feedback Source Current (Ifb) 1.20 1.00 0.80 0.60 0.40 0.20 0.00 - emp[ ℃ ] Start up Current (Istart) 1.20 1.00 0.80 ...

Page 10

FSDH321, FSDL321 Functional Description 1. Startup : In previous generations of Fairchild Power TM Switches (FPS ) the Vstr pin had an external resistor to the DC input voltage line. In this generation the startup resistor is replaced by an ...

Page 11

Vcc 8V OLP 6V FPS switching FPS switching FPS switching FPS switching 3V Delay current (5uA) charges the Cfb Delay current (5uA) charges the Cfb Delay current (5uA) charges the Cfb Delay current (5uA) charges the Cfb ...

Page 12

FSDH321, FSDL321 Figure 8. Soft Start Function 6. Burst operation : In order to minimize power TM standby mode, the FPS enters burst mode + ...

Page 13

Adjusting Current limit function: combined 2.8K internal resistance is connected into the non-inverting lead on the PWM comparator. A external resistance the current limit pin forms a parallel resis- tance with the 2.8K when the internal ...

Page 14

FSDH321, FSDL321 Typical application circuit 1. PC Auxiliary Power Circuit (10W Output Power) 140~375 VDC INPUT R101 680k Ω Ω Ω Ω 1W Vstr IC101 FSDx321 3 Vfb C104 22nF 10W PC Auxiliary Power, 150~375VDC Input Power supply: It shows ...

Page 15

Transformer Specification (10W Output Power) 1. Schematic Diagram EE1625 Vcc Winding Specification ...

Page 16

FSDH321, FSDL321 Layout Considerations DC_link Capacitor #1 : GND #2 : VCC #3 : Vfb #4 : Ipk #5 : Vstr #6 : Drain #7 : Drain #8 : Drain Figure 13. Layout Considerations for FSDx321 using 8DIP 16 SURFACE ...

Page 17

Package Dimensions 8DIP FSDH321, FSDL321 17 ...

Page 18

FSDH321, FSDL321 Package Dimensions 18 (Continued) 8LSOP ...

Page 19

Ordering Information Product Number Package FSDH321 8DIP FSDL321 8DIP FSDH321L 8LSOP FSDL321L 8LSOP Marking Code BV DSS DH321 650V DL321 650V DH321 650V DL321 650V FSDH321, FSDL321 F R OSC DS(on) 100KHz 14 50KHz 14 100KHz 14 50KHz 14 19 ...

Page 20

FSDH321, FSDL321 DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT ...

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