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Q0270R View Datasheet(PDF) - Fairchild Semiconductor

Part NameDescriptionManufacturer
Q0270R (FSQ0x70RNA) Green Mode Fairchild Power Switch Fairchild
Fairchild Semiconductor Fairchild
Q0270R Datasheet PDF : 17 Pages
1 2 3 4 5 6 7 8 9 10 Next Last
Pin Configuration
GND
D
VCC
8-DIP
D
FB
D
IPK
Vstr
FSQ0x70RNA Rev. 1.00
Figure 3. Pin Configuration (Top View)
Pin Definitions
Pin #
Name
1
GND
2
VCC
3
FB
4
IPK
5
Vstr
6
Drain
7
Drain
8
Drain
Description
Ground. SenseFET source terminal on primary side and internal control
ground.
Power Supply. Positive supply voltage input. Although connected to an aux-
iliary transformer winding, current is supplied from pin 5 (Vstr) via an internal
switch during start-up, see Figure 2. It is not until VCC reaches the UVLO upper
threshold (12V) that the internal start-up switch opens and device power is
supplied via the auxiliary transformer winding.
Feedback. The feedback voltage pin is the non-inverting input to the PWM
comparator. It has a 0.9mA current source connected internally while a capac-
itor and opto-coupler are typically connected externally. A feedback voltage of
6V triggers overload protection (OLP). There is a time delay while charging ex-
ternal capacitor CFB from 3V to 6V using an internal 5µA current source. This
time delay prevents false triggering under transient conditions, but still allows
the protection mechanism to operate under true overload conditions.
Peak Current Limit. This pin adjusts the peak current limit of the SenseFET.
The 0.9mA feedback current source is diverted to the parallel combination of
an internal 2.8kΩ resistor and any external resistor to GND on this pin. This
determines the peak current limit. If this pin is tied to VCC or left floating, the
typical peak current limit is 0.8A (FSQ0170RNA), 0.9A (FSQ0270RNA), or
1.1A (FSQ0370RNA).
Start-up. This pin connects to the rectified AC line voltage source. At start-up,
the internal switch supplies internal bias and charges an external storage ca-
pacitor placed between the VCC pin and ground. Once the VCC reaches 12V,
the internal switch is opened.
SenseFET drain. High-voltage power SenseFET drain connection.
SenseFET drain. High-voltage power SenseFET drain connection.
SenseFET drain. High-voltage power SenseFET drain connection.
© 2006 Fairchild Semiconductor Corporation
FSQ0170RNA, FSQ0270RNA, FSQ0370RNA Rev. 1.0.2
3
www.fairchildsemi.com
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