FSQ211 Fairchild Semiconductor, FSQ211 Datasheet - Page 3

• Manufacturer Part Number: FSQ211
• Description: IC SWIT PWM GREEN UVLO HV 8DIP
• Manufacturer: Fairchild Semiconductor

Specifications of FSQ211

• Output Isolation: Isolated
• Frequency Range: 61 ~ 73kHz
• Voltage - Input: 8 ~ 20 V
• Voltage - Output: 650V
• Power (watts): 1.4W
• Operating Temperature: 25°C ~ 145°C
• Package / Case: 8-DIP (0.300", 7.62mm)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

© 2007 Fairchild Semiconductor Corporation
FSQ211 Rev. 1.0.0
Pin Assignments
Pin Definitions
6,7,8
Pin
1
2
3
4
5
Name
Drain
GND
Vstr
V
V
NC
CC
FB
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 startup (see Block Diagram). It
is not until V
and device power is supplied via the auxiliary transformer winding.
Feedback. Inverts 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 external capacitor C
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
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 decreases leakage inductance.
CC
Figure 3.
CC
reaches the UVLO upper threshold (9V), that the internal start-up switch opens
pin and ground. Once the V
GND
Vcc
Vfb
NC
1
2
3
4
Pin Configuration (Top View)
3
Description
8
7
6
5
CC
Drain
Drain
Drain
Vstr
reaches 9V, the internal switch stops charging
FB
from 3V to 4.5V using an
www.fairchildsemi.com