FS8S0765RCB Fairchild Power Switch (FPS™)
April 2006
FS8S0765RCB
Fairchild Power Switch (FPS™)
Features
Burst Mode Operation to Reduce the Power
Consumption in the Standby Mode
External pin for Synchronization and Soft Start
Wide Operating Frequency Range up to 150kHz
Low Start-up Current (Max:80μA)
Low Operating Current (Max:15mA)
Pulse by Pulse Current Limiting
Over-Voltage Protection (Auto Restart Mode)
Overload Protection (Auto Restart Mode)
Abnormal Over-Current Protection (Auto Restart
Mode)
Internal Thermal Shutdown (Auto Restart Mode)
Under-Voltage Lockout
Internal High-Voltage SenseFET
Description
FS8S0765RCB is a Fairchild Power Switch (FPS) that is
specially designed for off-line SMPS of CRT monitors
with minimal external components. This device is a
current mode pulse-width modulated (PWM) controller
combined with a high-voltage power SenseFET in a single
package. The PWM controller features integrated
oscillator to be synchronized with the external sync
signal, under-voltage lockout, optimized gate driver,
temperature compensated precise current sources for
the loop compensation. This device also includes
various fault-protection, circuits such as over voltage
protection, overload protection, abnormal over current
protection and over-temperature protection, Compared
with a discrete MOSFET and PWM controller solution,
FPS can reduce total cost, component count, size, weight,
while increasing efficiency, productivity, and system
reliability. This device is well suited for the cost-effective
monitor power supply.
Applications
SMPS for Monitor
TO-220-5L
1
1. Drain 2. GND 3. V
CC
4. Feedback 5. Sync
Ordering Information
Product Number
FS8S0765RCBTU
(1)
FS8S0765RCBYDTU
(2)
Notes:
1. TU: Non Forming Type
2. YDTU: Forming Type
Package
TO-220-5L
TO-220-5L (Forming)
Marking Code
8S0765RC
BV
DSS
650V
R
DS(ON)
1.6Ω
FPS
TM
is a trademark of Fairchild Semiconductor Corporation.
©2006 Fairchild Semiconductor Corporation
1
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FS8S0765RCB Rev. 1.0.2
FS8S0765RCB Fairchild Power Switch (FPS™)
Internal Block Diagram
Vref
Vcc
3
Vcc Good
Drain
1
Soft start 5
& Sync
Burst Mode Detector
Vfb<0.8V
Vss>3V
No sync
Vref
Burst Mode
Controller
9V/15V
Sync
Detector
Vref
OSC
Internal
Bias
Vcc
I
delay
Vref
I
FB
PWM
2.5R
S
R
Q
FB
4
R
Q
Gate
driver
LEB
V
SD
Vcc
Vovp
TSD
UVLO Reset
(Vcc<9V)
S
R
Q
2 GND
Q
AOCP
Vocl
Figure 1. Functional Block Diagram
FS8S0765RCB Rev. 1.0.2
2
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FS8S0765RCB Fairchild Power Switch (FPS™)
Pin Configuration
5. Soft Start & Sink
FS8S0765RC
4. Feedback
3. Vcc
2. GND
1. Drain
Figure 2. Pin Configuration (Top View)
Pin Definitions
Pin Number
1
2
3
Pin Name
Drain
GND
Vcc
Pin Function Description
SenseFET Drain.
High voltage power SenseFET drain connection. This pin is
designed to drive the transformer directly.
Ground.
Control ground and the SenseFET source.
Supply Voltage.
Supply input. This pin provides internal operating current for
both start-up and steady-state operation.
Feedback.
Internally connected to the inverting input of the PWM comparator.
For stable operation, a capacitor should be placed between this pin and GND.
If the voltage of this pin reaches 7.5V, the overload protection is activated,
resulting in shutdown of FPS.
Soft Start and Sync.
For soft-start and synchronization to the external sync
signal.
4
Feedback
5
Soft Start & Sync
FS8S0765RCB Rev. 1.0.2
3
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FS8S0765RCB Fairchild Power Switch (FPS™)
Absolute Maximum Ratings
The “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. The
device should not be operated at these limits. The parametric values defined in the Electrical Characteristics tables
are not guaranteed at the absolute maximum ratings. The “Recommended Operating Conditions” table defines the
conditions for actual device operation. (T
A
= 25°C, unless otherwise specified)
Symbol
V
DSS
V
DGR
V
GS
I
DM
E
AS
I
AS
I
D
I
D
V
CC
V
FB
V
S_S
P
D
(Watt H/S)
Derating
T
j
T
A
T
STG
Parameter
Drain-Source (GND) Voltage
(1)
Drain-Gate Voltage (R
GS
=1MΩ)
Gate-Source (GND) Voltage
Drain Current Pulsed
(2)
Single Pulsed Avalanche Energy
(3)
Single Pulsed Avalanche Current
(4)
Continuous Drain Current (Tc = 25°C)
Continuous Drain Current (Tc=100°C)
Supply Voltage
Input Voltage Range
Total Power Dissipation
Operating Junction Temperature
Operating Ambient Temperature
Storage Temperature Range
Value
650
650
±30
28
370
17
7
4.5
40
-0.3 to Vcc
-0.3 to 10
145
1.16
+150
-25 to +85
-55 to +150
Unit
V
V
V
A
DC
mJ
A
A
DC
A
DC
V
V
V
W
W/°C
°C
°C
°C
Notes:
1. Tj=25°C to 150°C
2. Repetitive rating: Pulse width limited by maximum junction temperature
3. L=14mH, starting Tj=25°C
4. L=13μH, starting Tj=25°C
FS8S0765RCB Rev. 1.0.2
4
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FS8S0765RCB Fairchild Power Switch (FPS™)
Electrical Characteristics (SenseFET part)
(T
A
= 25°C
unless otherwise specified)
Symbol
BV
DSS
I
DSS
R
DS(ON)
gfs
Ciss
Coss
Crss
td (on)
tr
td (off)
tf
Qg
Qgs
Qgd
Parameter
Drain Source Breakdown Voltage
Zero Gate Voltage Drain Current
Static Drain Source On Resistance
(1)
Forward Transconductance
Input Capacitance
Output Capacitance
Reverse Transfer Capacitance
Turn On Delay Time
Rise Time
Turn Off Delay Time
Fall Time
Total Gate Charge
(Gate-Source+Gate-Drain)
Gate-Source Charge
Gate-Drain (Miller) Charge
Condition
V
GS
=0V, I
D
=250μA
V
DS
=650V, V
GS
=0V
V
DS
=520V
V
GS
=0V, T
C
=125°C
V
GS
=10V, I
D
=3.5A
V
DS
=40V, I
D
=3.5A
V
GS
=0V, V
DS
=25V,
f = 1MHz
Min.
650
-
-
-
-
-
-
-
-
-
-
-
Typ.
-
-
-
1.4
8
1415
100
15
25
60
115
65
40
7
12
Max.
-
200
300
1.6
-
-
-
-
-
-
-
-
-
-
-
Unit
V
μA
μA
W
mho
pF
V
DD
=325V, I
D
=6.5A
(2)
nS
V
GS
=10V, I
D
=6.5A,
V
DS
=325V
(2)
-
-
-
nC
Note:
1.
Pulse test: Pulse width
≤
300μS, duty 2%
2.
MOSFET switching time is essentially independent of operating temperature.
FS8S0765RCB Rev. 1.0.2
5
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