FSDM311L Fairchild Semiconductor, FSDM311L Datasheet - Page 3

• Manufacturer Part Number: FSDM311L
• Description: IC SWIT PWM GREEN OVP HV 8SOP
• Manufacturer: Fairchild Semiconductor

Specifications of FSDM311L

• Output Isolation: Isolated
• Frequency Range: 61 ~ 73kHz
• Voltage - Input: 7 ~ 20 V
• Voltage - Output: 650V
• Power (watts): 13W
• Operating Temperature: 25°C ~ 150°C
• Package / Case: 8-SOP, 8-LSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: FSDM311L_NL; FSDM311L_NL

© 2003 Fairchild Semiconductor Corporation
FSDM311 Rev. 1.1.0 • 7/14/06
Pin Assignments
Pin Definitions
Pin Number
6,7,8
1
2
3
4
5
Pin Name
Drain
GND
Vstr
V
Vfb
NC
CC
Ground. SenseFET source terminal on primary side and internal control
ground.
Positive supply voltage input. Although connected to an auxiliary
transformer winding, current is supplied from pin 5 (Vstr) via an internal switch
during start-up (see Internal Block Diagram section). When V
UVLO upper threshold (9V), the internal start-up switch opens and device
power is supplied by the auxiliary transformer winding.
Feedback. Inverting input to the PWM comparator with its normal input level
between 0.5V and 2.5V. It has a 0.4mA current source connected internally,
while a capacitor and opto-coupler are typically connected externally. A
feedback voltage of 4.5V triggers overload protection (OLP). There is a time
delay while charging the external capacitor Cfb from 3V to 4.5V using an
internal 5μA current source. This time delay prevents false triggering under
transient conditions, but allows the protection mechanism to operate under true
overload conditions.
No Connection.
Start-up. This pin connects directly to the rectified AC line voltage source. At
start-up, the internal switch supplies internal bias and charges an external
storage capacitor placed between the V
reaches 9V, the internal switch stops charging the capacitor.
SenseFET Drain. The drain pins are designed to connect directly to the
primary lead of the transformer and are capable of switching a maximum of
650V. Minimizing the length of the trace connecting these pins to the
transformer is recommended to decrease leakage inductance.
Figure 3 Pin Configuration (Top View)
3
Pin Function Description
CC
pin and ground. Once the V
CC
reaches the
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CC