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FSBH0F70A Schematic ( PDF Datasheet ) - Fairchild Semiconductor

Teilenummer FSBH0F70A
Beschreibung Green Mode Fairchild Power Switch
Hersteller Fairchild Semiconductor
Logo Fairchild Semiconductor Logo 




Gesamt 16 Seiten
FSBH0F70A Datasheet, Funktion
April 2010
FSBH0F70A, FSBH0170/A, FSBH0270/A, FSBH0370
Green Mode Fairchild Power Switch (FPS™)
Features
ƒ Brownout Protection with Hysteresis
ƒ Built-In 5ms Soft-Start Function
ƒ Internal Avalanche-Rugged 700V SenseFET
ƒ No Acoustic Noise During Light-Load Operation
ƒ High-Voltage Startup
ƒ Linearly Decreasing PWM Frequency to 18KHz
ƒ Peak-Current-Mode Control
ƒ Cycle-by-Cycle Current Limiting
ƒ Leading-Edge Blanking (LEB)
ƒ Synchronized Slope Compensation
ƒ Internal Open-Loop Protection
ƒ VDD Under-Voltage Lockout (UVLO)
ƒ VDD Over-Voltage Protection (OVP)
ƒ Internal Auto-Restart Circuit (OVP, OTP)
ƒ Constant Power Limit (Full AC Input Range)
ƒ Internal OTP Sensor with Hysteresis
ƒ VIN Pin for Pull-HIGH Latch Function and Pull-
LOW Auto-Recovery Protection
Applications
General-purpose switch-mode power supplies and
flyback power converters, including:
ƒ Auxiliary Power Supply for PC and Server
ƒ SMPS for VCR, SVR, STB, DVD & DVCD Player,
Printer, Facsimile, and Scanner
ƒ Adapter for Camcorder
Description
The highly integrated FSBH-series consists of an
integrated current-mode Pulse Width Modulator (PWM)
and an avalanche-rugged 700V SenseFET. It is
specifically designed for high-performance offline
Switch Mode Power Supplies (SMPS) with minimal
external components.
The integrated PWM controller features include a
proprietary green-mode function that provides off-time
modulation to linearly decrease the switching frequency
at light-load conditions to minimize standby power
consumption. To avoid acoustic-noise problems, the
minimum PWM frequency is set above 18kHz. This
green-mode function enables the power supply to meet
international power conservation requirements. The
PWM controller is manufactured using the BiCMOS
process to further reduce power consumption. The
FSBH-series turns off some internal circuits to improve
power saving when VFB is lower than 1.6V, which allows
an operating current of only 2.5mA.
The FSBH-series has built-in synchronized slope
compensation to achieve stable peak-current-mode
control. The proprietary external line compensation
ensures constant output power limit over a wide AC
input voltage range, from 90VAC to 264VAC.
The FSBH-series provides many protection functions. In
addition to cycle-by-cycle current limiting, the internal
open-loop protection circuit ensures safety when an
open-loop or output short occurs. PWM output is
disabled until VDD drops below the VTH-OLP, then the
controller starts up again. As long as VDD exceeds 28V,
the internal OVP circuit is triggered.
Compared with a discrete MOSFET and controller or
RCC switching converter solution, the FSBH-series
reduces total component count, design size, and
weight; while increasing efficiency, productivity, and
system reliability. These devices provide a basic
platform that is well suited for the design of cost-
effective flyback converters, such as in PC auxiliary
power supplies.
© 2009 Fairchild Semiconductor Corporation
FSBH0F70A, FSBH0170/A, FSBH0270/A, FSBH0370 • Rev. 1.0.3
www.fairchildsemi.com






FSBH0F70A Datasheet, Funktion
Electrical Characteristics
VDD=15V and TA=25°C unless otherwise specified.
Symbol
Parameter
SenseFET Section(10)
BVDSS
Drain-Source
Breakdown Voltage
FSBH0x70/A
Condition
VDS = 700V, VGS = 0V
IDSS
RDS(ON)
CISS
COSS
CRSS
tD(ON)
tR
tD(OFF)
tF
Zero-Gate-Voltage
Drain Current
Drain-Source On-
State Resistance(11)
Input Capacitance
Output Capacitance
Reverse Transfer
Capacitance
Turn-On Delay Time
Rise Time
Turn-Off Delay Time
Fall Time
FSBH0x70/A
FSBH0F70A
FSBH0170/A
FSBH0270/A
FSBH0370
FSBH0F70A
FSBH0170/A
FSBH0270/A
FSBH0370
FSBH0F70A
FSBH0170/A
FSBH0270/A
FSBH0370
FSBH0F70A
FSBH0170/A
FSBH0270/A
FSBH0370
FSBH0F70A
FSBH0170/A
FSBH0270/A
FSBH0370
FSBH0F70A
FSBH0170/A
FSBH0270/A
FSBH0370
FSBH0F70A
FSBH0170/A
FSBH0270/A
FSBH0370
FSBH0F70A
FSBH0170/A
FSBH0270/A
FSBH0370
VDS = 700V, VGS = 0V
VDS = 560V, VGS = 0V,
TC = 125°C
VGS = 10V, ID = 0.5A
VGS = 0V, VDS = 25V,
f = 1MHz
VGS = 0V, VDS = 25V,
f = 1MHz
VGS = 0V, VDS = 25V,
f = 1MHz
VDS = 350V, ID = 1.0A
VDS = 350V, ID = 1.0A
VDS = 350V, ID = 1.0A
VDS = 350V, ID = 1.0A
Min. Typ. Max. Unit
700 V
50
μA
200
14.00
8.80
6.00
4.00
162
250
550
315
18
25
38
47
3.8
10.0
17.0
9.0
9.5
12.0
20.0
11.2
19
4
15
34
33.0
30.0
55.0
28.2
42
10
25
32
19.00
11.00
7.20
4.75
211
325
715
410
24
33
50
61
5.7
15.0
26.0
24.0
29.0
34.0
50.0
33.0
48
18
40
78
76.0
70.0
120.0
67.0
94
30
60
74
pF
pF
pF
ns
ns
ns
ns
Continued on the following page…
© 2009 Fairchild Semiconductor Corporation
FSBH0F70A, FSBH0170/A, FSBH0270/A, FSBH0370 • Rev. 1.0.3
6
www.fairchildsemi.com

6 Page









FSBH0F70A pdf, datenblatt
Functional Description
Startup Operation
The HV pin is connected to bulk voltage through an
external resistor, RHV, as shown in Figure 26. When AC
voltage is applied to power system, an internal HV
startup circuit provides a high current (around 3.5mA) to
charge an external VDD capacitor until VDD voltage
exceeds the turn-on threshold voltage (VDD-ON). For
better power consumption, the HV startup circuit shuts
down during normal operation. The external VDD
capacitor and auxiliary winding maintain the VDD voltage
and provide operating current to controller.
Brown-In/Out Function
FSBH0x70 has a built-in internal brown-in/out protection
comparator monitoring voltage of VIN pin. Figure 28
shows a resistive divider with low-pass filtering for line-
voltage detection on the VIN pin.
Figure 26. Startup Circuit
Slope Compensation
The FSBH-series is designed for flyback power
converters. The peak-current-mode control is used to
optimize system performance. Slope compensation is
added to reduce current loop gain and improve power
system stability. The FSBH-series has a built-in,
synchronized, positive slope for each switching cycle.
Soft-Start
The FSBH-series has an internal soft-start circuit that
reduces the SenseFET switching current during power
system startup. The characteristic curve of soft-start
time versus VLMT level is shown in Figure 27. The VLMT
level slopes up like a six-step staircase. In doing so,
power system can smoothly build up the rated output
voltage and effectively reduce voltage stress on the
PWM switch and output diode.
Figure 28. Brown-In/Out Function on VIN Pin
Once the VIN pin voltage is lower than 0.6V and lasts
for 500ms, the PWM gate is disabled to protect the
system from over current. FSBH0x70 starts up as VIN
increases above 1.1V. Because the divider resistors of
the VIN pin are connected behind the bridge, the ratio
calculation for brownout in PFC and non-PFC system
are different, as shown in Figure 29. The formulas are
provided in the following equations:
Brownout with PFC:
RC
RA + RB + RC
2VAC _ OUT
2
π
= 0.6
(1)
Brownout with non-PFC:
RC
RA + RB + RC
2VAC _OUT = 0.6
Brown-in level is determined by:
VAC _ IN
=
1.1 RA
2
+ RB
RC
+ RC
(2)
(3)
Figure 27. Soft-Start Function
© 2009 Fairchild Semiconductor Corporation
FSBH0F70A, FSBH0170/A, FSBH0270/A, FSBH0370 • Rev. 1.0.3
Figure 29. VIN Level According to PFC Operation
www.fairchildsemi.com
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