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PDF 7M0880 Data sheet ( Hoja de datos )
| Número de pieza | 7M0880 | |
| Descripción | FS7M0880 | |
| Fabricantes | Fairchild Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de 7M0880 (archivo pdf) en la parte inferior de esta página. Total 18 Páginas | ||
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www.DataSheet4U.com
FS7M0680, FS7M0880
Fairchild Power Switch (FPSTM)
www.fairchildsemi.com
Features
• Pulse by Pulse Current Limit
• Over load protection (OLP) - Latch
• Over voltage protection (OVP) - Latch
• Internal Thermal Shutdown (TSD) - Latch
• Under Voltage Lock Out (UVLO) with hysteresis
• Internal High Voltage SenseFET (800V rated)
• User defined Soft Start
• Precision Fixed Operating Frequency (66kHz)
Application
• PC power supply
• PDP
Table 1. Maximum Output Power
OUTPUT POWER TABLE
PRODUCT
230VAC ±15%(2)
Open Frame(1)
85-265VAC
Open Frame(1)
FS7M0680
80W (Flyback)
150W (Forward)
180W (Forward) (3)
65W (Flyback)
FS7M0880
110W (Flyback)
200W (Forward)
250W (Forward) (3)
85W (Flyback)
Notes: 1. Maximum practical continuous power in an open
frame design at 50°C ambient. 2. 230 VAC or 100/115
VAC with doubler. 3. When the cooling fan is used.
Description
The Fairchild Power Switch FS7M-series is an integrated
Pulse Width Modulator (PWM) and Sense FET 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 combine an avalanche rugged Sense FET
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,
soft start, temperature compensated precise current sources
for a loop compensation and self protection circuitry.
Compared with discrete MOSFET and PWM controller
solution, it can reduce total cost, component count, size and
weight simultaneously increasing efficiency, productivity, and
system reliability. This device is a basic platform well suited
for cost effective designs of flyback and forward converters.
Typical Circuit
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AC IN
FS7M-series
S/S
PWM
VFB Vcc
Drain
GND
Vo
Figure 1. Typical Forward Application
©2005 Fairchild Semiconductor Corporation
Rev.1.0.2
datasheet pdf - http://www.DataSheet4U.net/
1 page  
FS7M0680, FS7M0880
Electrical Characteristics (SenseFET Part)
(Ta=25°C unless otherwise specified)
FS7M0680
Parameter
Drain-Source Breakdown Voltage
Zero Gate Voltage Drain Current
Static Drain-Source On Resistance (note1)
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
Symbol
BVDSS
IDSS
RDS(ON)
Ciss
Coss
Crss
td(on)
tr
td(off)
tf
Qg
Qgs
Qgd
Condition
VGS=0V, ID=50µA
VDS=Max., Rating,
VGS=0V
VDS=0.8Max., Rating,
VGS=0V, TC=125°C
VGS=10V, ID=5.0A
VGS=0V, VDS=25V,
f=1MHz
VDD=0.5BVDSS, ID=8.0A
(MOSFET switching
time are essentially
independent of
operating temperature)
VGS=10V, ID=8.0A,
VDS=0.5BVDSS (MOSFET
switching time are
essentially independent of
operating temperature)
Min.
800
-
-
-
-
-
-
-
-
-
-
-
-
-
Typ. Max.
--
- 50
- 200
1.6
1600
140
42
60
150
300
130
2.0
-
-
-
-
-
-
-
70 -
16 -
27 -
Unit
V
µA
µA
Ω
pF
nS
nC
FS7M0880
Parameter
Drain-Source Breakdown Voltage
Zero Gate Voltage Drain Current
Static Drain-Source On Resistance (note1)
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
Symbol
BVDSS
IDSS
RDS(ON)
Ciss
Coss
Crss
td(on)
tr
td(off)
tf
Qg
Qgs
Qgd
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Condition
VGS=0V, ID=50µA
VDS=Max., Rating,
VGS=0V
VDS=0.8Max., Rating,
VGS=0V, TC=125°C
VGS=10V, ID=5.0A
VGS=0V, VDS=25V,
f=1MHz
VDD=0.5BVDSS, ID=8.0A
(MOSFET switching
time are essentially
independent of
operating temperature)
VGS=10V, ID=8.0A,
VDS=0.5BVDSS (MOSFET
switching time are
essentially independent of
operating temperature)
Min.
800
-
-
-
-
-
-
-
-
-
-
-
-
-
Typ. Max.
--
- 50
- 200
1.2
2460
210
64
-
95
150
60
1.5
-
-
-
90
200
450
150
- 150
20 -
70 -
Unit
V
µA
µA
Ω
pF
nS
nC
Note:
1. Pulse test: Pulse width ≤ 300µS, duty cycle ≤ 2%
5
datasheet pdf - http://www.DataSheet4U.net/
5 Page 
FS7M0680, FS7M0880
Vcc Vref
Idelay
IFB
Vo Vfb
H11A817A
4
CB
OSC
D1 D2
2.5R
KA431
+
Vfb* R
-
SenseFET
Gate
driver
VSD
OLP
Rsense
Figure 6. Pulse width modulation (PWM) circuit
3. Protection Circuit : The FS7M-series has several self
protective functions such as over load protection (OLP),
abnormal over current protection (AOCP), over voltage
protection (OVP) and thermal shutdown (TSD). All the
protections are latch mode protection. Because these
protection circuits are fully integrated into the IC without
external components, the reliability can be improved without
increasing cost.
Once protection triggers, switching is terminated and Vcc
continues charging and discharging between 9V and 15V
until the AC power line is un-plugged. The latch is reset only
when Vcc is fully discharged by un-plugging the Ac power
line.
3.1 Over Load Protection (OLP) : Overload is defined as
the load current exceeding its normal level due to an
unexpected abnormal event. In this situation, the protection
circuit should trigger in order to protect the SMPS. However,
even when the SMPS is in the normal operation, the over
load protection circuit can be triggered during the load
transition. In order to avoid this undesired operation, the
over load protection circuit is designed to trigger after a
specified time to determine whether it is a transient situation
or an overload situation. Because of the pulse-by-pulse
current limit capability, the maximum peak current through
the Sense FET is limited, and therefore the maximum input
power is restricted with a given input voltage. If the output
consumes more than this maximum power, the output
voltage (Vo) decreases below the set voltage. This reduces
the current through the opto-coupler LED, which also
reduces the opto-coupler transistor current, thus increasing
the feedback voltage (Vfb). If Vfb exceeds 2.8V, D1 is
blocked and the 5uA current source starts to charge CB
slowly up to Vcc. In this condition, Vfb continues increasing
until it reaches 7.5V, when the switching operation is
terminated as shown in Figure 8. The delay time for
shutdown is the time required to charge CB from 2.8V to
7.5V with 5uA. In general, a 20 ~ 50 ms delay time is typical
for most applications. This protection is implemented in auto
restart mode.
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VFB
7.5V
Over load protection
AC line
plugged-in
Vds
Fault
occurs
AC line
un-plugged
AC line
plugged-in
Vcc reset
Vcc
15V
9V
6V
Normal
operation
Latch
t
Normal
operation
Figure 7. Auto restart mode protection
2.8V
T12= CB*(7.5-2.8)/Idelay
T1
Figure 8. Over load protection
T2 t
3.2 Abnormal Over Current Protection (AOCP) : When
the secondary rectifier diodes or the transformer pins are
shorted, a steep current with extremely high di/dt can flow
through the SenseFET during the LEB time. Even though the
FS7M-series has OLP (Over Load Protection), it is not
enough to protect the FPS in that abnormal case, since sever
current stress will be imposed on the SenseFET until OLP
triggers. The FS7M-series has an internal AOCP (Abnormal
Over Current Protection) circuit as shown in Figure 9. When
the gate turn-on signal is applied to the power Sense FET,
the AOCP block is enabled and monitors the current through
the sensing resistor. The voltage across the resistor is then
11
datasheet pdf - http://www.DataSheet4U.net/
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet 7M0880.PDF ] | |
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