
2005 Fairchild Semiconductor Corporation
www.fairchildsemi.com
Rev.1.0.0
FPS
TM
is a trademark of Fairchild Semiconductor Corporation
Features
Internal Avalanche Rugged SenseFET
Advanced Burst-Mode Operation Consumes Under One
W at 240VAC & 0.5W Load
Precision Fixed Operating Frequency (66kHz)
Internal Start-up Circuit
Improved Pulse by Pulse Current Limiting
Over Voltage Protection (OVP) : Auto-Restart
Over Load Protection (OLP): Auto-Restart
Internal Thermal Shutdown (TSD) : Auto-Restart
Under Voltage Lock Out (UVLO) with Hysteresis
Low Operating Current (2.5mA)
Built-in Soft Start
Application
SMPS for LCD monitor and STB
Adapter
Related Application Notes
AN4137
- Design Guidelines for Off-line Flyback
Converters Using Fairchild Power Switch (FPS)
AN4140
- Transformer Design Consideration for Off-line
Flyback Converters Using Fairchild Power Switch
AN4141
- Troubleshooting and Design Tips for Fairchild
Power Switch Flyback Applications
AN4148
- Audible Noise Reduction Techniques for FPS
Applications
Description
The FSDM0465RB is an integrated Pulse Width Modulator
(PWM) and SenseFET specifically designed for high
performance offline Switch Mode Power Supplies (SMPS)
with minimal external components. This device is an
integrated high voltage power switching regulator which
combines a rugged avalanche, SenseFET with a current mode
PWM control block. The PWM controller includes integrated
fixed frequency oscillator, under voltage lockout, leading edge
blanking (LEB), optimized gate driver, internal soft start,
temperature compensated precise current sources for a loop
compensation and self protection circuitry. Compared with a
discrete MOSFET and PWM controller solution, the PWM/
FSDMRB can reduce total cost, component count, size and
weigh, while simultaneously increasing efficiency, productivity,
and system reliability. This device provides a basic platform
well suited for cost-effective designs of flyback converters.
Table 1. Maximum Output Power
Notes:
1. Typical continuous power in a non-ventilated 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.
4. The junction temperature can limit the maximum output
power.
Typical Circuit
Figure 1. Typical Flyback Application
OUTPUT POWER TABLE
(4)
230VAC
±
15%
(3)
Adapt-
er
(1)
Frame
(2)
PRODUCT
85-265VAC
Open
Adapt-
er
(1)
Open
Frame
(2)
FSDM0465RB
48W
56W
40W
48W
FSDM0565RB
FSDM07652RB
60W
70W
70W
80W
50W
60W
60W
70W
FSDM12652RB
90W
110W
80W
90W
Drain
Source
Vstr
Vfb
Vcc
PWM
AC
IN
DC
OUT
FS DM0465RB
Green Mode Fairchild Power S w itch (FPS
T M
)