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FSBH0270 Schematic ( PDF Datasheet ) - Fairchild Semiconductor

Teilenummer FSBH0270
Beschreibung Green Mode Fairchild Power Switch
Hersteller Fairchild Semiconductor
Logo Fairchild Semiconductor Logo 




Gesamt 16 Seiten
FSBH0270 Datasheet, Funktion
June 2013
FSBH0F70A _F116, FSBH0170_F116,
FSBH0270_F116, FSBH0370_F116
Green Mode Fairchild Power Switch (FPS™)
Features
Brownout Protection with Hysteresis
Built-In 5 ms Soft-Start Function
Internal Avalanche-Rugged 700 V SenseFET
Low Acoustic Noise During Light-Load Operation
High-Voltage Startup
Linearly Decreasing PWM Frequency to 18 KHz
Peak-Current-Mode Control
Cycle-by-Cycle Current Limiting
Leading-Edge Blanking (LEB)
Synchronized Slope Compensation
Internal Open-Loop Protection
VDD Under-Voltage Lockout (UVLO)
VDD Over-Voltage Protection (OVP)
Internal Auto-Restart Circuit (OVP, OTP)
Constant Power Limit (Full AC Input Range)
Internal OTP Sensor with Hysteresis
VIN Pin for Pull-HIGH Latch Function and
Pull-LOW Auto-Recovery Protection
Applications
General-purpose switched-mode power supplies and
flyback power converters, including:
Auxiliary Power Supply for PC and Server
SMPS for VCR, SVR, STB, DVD & DVCD Player,
Printer, Facsimile, and Scanner
Adapter for Camcorder
Description
The highly integrated FSBH-series consists of an
integrated current-mode Pulse Width Modulator (PWM)
and an avalanche-rugged 700 V SenseFET. It is
specifically designed for high-performance offline
Switched-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 18 kHz. 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 1.6 V, which
allows an operating current of only 2.5 mA.
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 90 VAC to 264 VAC.
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 28 V,
the internal OVP circuit is triggered.
Compared with a discrete MOSFET and controller or
RCC switching converter solution, the FSBH-series
reduces 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.
© 2010 Fairchild Semiconductor Corporation
FSBH0F70A_F116, FSBH0170/0270/0370_F116 • Rev. 1.0.2
1
www.fairchildsemi.com






FSBH0270 Datasheet, Funktion
Electrical Characteristics
VDD=15 V and TA=25C unless otherwise specified.
Symbol
Parameter
SenseFET Section
BVDSS
Drain-Source
Breakdown Voltage
IDSS
Zero-Gate-Voltage
Drain Current
RDS(ON)
Drain-Source On-
State Resistance(12)
CISS Input Capacitance
COSS Output Capacitance
CRSS
Reverse Transfer
Capacitance
tD(ON) Turn-On Delay
tR Rise Time
tD(OFF) Turn-Off Delay
tF Fall Time
Condition
ID=250 µA, VGS=0 V
VDS=700 V, VGS=0 V
VDS=560 V, VGS=0 V, TC=125C
FSBH0F70A_F116
VGS=10 V, ID=0.5 A
FSBH0170_F116
FSBH0270_F116
FSBH0370_F116
FSBH0F70A_F116
VGS=0 V, VDS=25 V,
f=1 MHz
FSBH0170_F116
FSBH0270_F116
FSBH0370_F116
FSBH0F70A_F116
VGS=0 V, VDS=25 V,
f=1 MHz
FSBH0170_F116
FSBH0270_F116
FSBH0370_F116
FSBH0F70A_F116
VGS=0 V, VDS=25 V,
f=1 MHz
FSBH0170_F116
FSBH0270_F116
FSBH0370_F116
FSBH0F70A_F116
VDS=350 V, ID=1.0 A
FSBH0170_F116
FSBH0270_F116
FSBH0370_F116
FSBH0F70A_F116
VDS=350 V, ID=1.0 A
FSBH0170_F116
FSBH0270_F116
FSBH0370_F116
FSBH0F70A_F116
VDS=350 V, ID=1.0 A
FSBH0170_F116
FSBH0270_F116
FSBH0370_F116
FSBH0F70A_F116
VDS=350 V, ID=1.0 A
FSBH0170_F116
FSBH0270_F116
FSBH0370_F116
Min. Typ. Max. Unit
700 V
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
50
200
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
μA
pF
pF
pF
ns
ns
ns
ns
Continued on the following page…
© 2010 Fairchild Semiconductor Corporation
FSBH0F70A_F116, FSBH0170/0270/0370_F116 • Rev. 1.0.2
6
www.fairchildsemi.com

6 Page









FSBH0270 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 the power system, an internal HV
startup circuit provides a high current (around 3.5 mA)
to charge an external VDD capacitor until VDD voltage
exceeds the turn-on threshold voltage (VDD-ON). For
lower 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 rises in six steps. By doing so, the 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 0.6 V and lasts
for 500 ms, the PWM gate is disabled to protect the
system from over current. FSBH0x70 starts up as VIN
increases above 1.1 V. Because the divider resistors of
the VIN pin are connected behind the bridge, the ratio
calculations 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
0.6
(1)
Brownout with non-PFC:
RC
RA RB RC
2VAC _ OUT 0.6
Brown-in level is determined by:
(2)
VAC _ IN
1.1 RA
2
RB
RC
RC
(3)
Figure 27. Soft-Start Function
© 2010 Fairchild Semiconductor Corporation
FSBH0F70A_F116, FSBH0170/0270/0370_F116 • Rev. 1.0.2
Figure 29. VIN Level According to PFC Operation
www.fairchildsemi.com
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