www.fairchildsemi.com
FSDH321, FSDL321
Features
• Internal Avalanche Rugged Sense FET
• Consumes only 0.65W at 240VAC & 0.3W load with
Advanced Burst-Mode Operation
• Frequency Modulation for EMI Reduction
• Precision Fixed Operating Frequency
• Internal Start-up Circuit
• Pulse-by-Pulse Current Limiting
• Abnormal Over Current Protection (AOCP)
• Over Voltage Protection (OVP)
• Over Load Protection (OLP)
• Internal Thermal Shutdown Function (TSD)
• Auto-Restart Mode
• Under Voltage Lockout (UVLO)
• Low Operating Current (max 3mA)
• Adjustable Peak Current Limit
• Built-in Soft Start
Green Mode Fairchild Power Switch (FPS
TM
)
OUTPUT POWER TABLE
230VAC
±15%
(3)
PRODUCT
FSDL321
FSDH321
FSDL0165RN
FSDM0265RN
FSDH0265RN
FSDL0365RN
FSDM0365RN
FSDL321L
FSDH321L
FSDL0165RL
FSDM0265RL
FSDH0265RL
FSDL0365RL
FSDM0365RL
Adapt-
er
(1)
11W
11W
13W
16W
16W
19W
19W
11W
11W
13W
16W
16W
19W
19W
Open
Frame
(2)
17W
17W
23W
27W
27W
30W
30W
17W
17W
23W
27W
27W
30W
30W
85-265VAC
Adapt-
er
(1)
8W
8W
11W
13W
13W
16W
16W
8W
8W
11W
13W
13W
16W
16W
Open
Frame
(2)
12W
12W
17W
20W
20W
24W
24W
12W
12W
17W
20W
20W
24W
24W
Applications
• SMPS for STB, Low cost DVD Player
• Auxiliary Power for PC
• Adapter & Charger
Related Application Notes
• AN-4137, 4141, 4147(Flyback) / AN-4134(Forward)
Description
Each product in the FSDx321 (x for H, L) family consists of
an integrated Pulse Width Modulator (PWM) and Sense
FET, and is specifically designed for high performance off-
line Switch Mode Power Supplies (SMPS) with minimal
external components. Both devices are integrated high volt-
age power switching regulators which combine an avalanche
rugged Sense FET with a current mode PWM control block.
The integrated PWM controller features include: a fixed
oscillator with frequency modulation for reduced EMI,
Under Voltage Lock Out (UVLO) protection, Leading Edge
Blanking (LEB), an optimized gate turn-on/turn-off driver,
Thermal Shut Down (TSD) protection, Abnormal Over Cur-
rent Protection (AOCP) and temperature compensated preci-
sion current sources for loop compensation and fault
protection circuitry. When compared to a discrete MOSFET
and controller or RCC switching converter solution, the
FSDx321 devices reduce total component count, design size,
weight while increasing efficiency, productivity and system
reliability. Both devices provide a basic platform that is well
suited for the design of cost-effective flyback converters.
FPS
TM
is a trademark of Fairchild Semiconductor Corporation.
©2005 Fairchild Semiconductor Corporation
Notes:
1. Typical continuous power in a non-ventilated enclosed
adapter with sufficient drain pattern as a heat sinker, at
50°C ambient.
2. Maximum practical continuous power in an open frame
design with sufficient drain pattern as a heat sinker, at 50°C
ambient.
3. 230 VAC or 100/115 VAC with doubler.
Typical Circuit
AC
IN
DC
OUT
Vstr
Ipk
PWM
Vfb
Drain
Vcc
Source
Figure 1. Typical Flyback Application
Rev.1.0.5
FAIRCHILD [ FAIRCHILD SEMICONDUCTOR ]
