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FSBH0170W Schematic ( PDF Datasheet ) - Fairchild Semiconductor

Teilenummer FSBH0170W
Beschreibung Green Mode Fairchild Power Switch
Hersteller Fairchild Semiconductor
Logo Fairchild Semiconductor Logo 




Gesamt 14 Seiten
FSBH0170W Datasheet, Funktion
June 2013
FSBH0F70WA, FSBH0170W, FSBH0270W
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
Applications
General-purpose switched-mode power supplies and
flyback power converters, including:
Au xiliary Power Supply for PC and Server
SMPS for VCR, SVR, STB, D VD & D VCD 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.
© 2011 Fairchild Semiconductor Corporation
FSBH0F70WA/0170W/0270W • Rev. 1.0.3
www.f airchildsemi.com






FSBH0170W 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
Min. Typ. Max. Unit
ID=250 µA, VGS=0 V
700 V
VDS=700 V, VGS=0 V
VDS=560 V, VGS=0 V, TC=125C
FSBH0F70WA
VGS=10 V, ID=0.5 A
FSBH0170W
FSBH0270W
VGS=0 V, VDS=25 V,
f=1 MH z
FSBH0F70WA
FSBH0170W
FSBH0270W
VGS=0 V, VDS=25 V,
f=1 MH z
FSBH0F70WA
FSBH0170W
FSBH0270W
VGS=0 V, VDS=25 V,
f=1 MH z
FSBH0F70WA
FSBH0170W
FSBH0270W
FSBH0F70WA
VDS=350 V, ID=1.0 A
FSBH0170W
FSBH0270W
FSBH0F70WA
VDS=350 V, ID=1.0 A
FSBH0170W
FSBH0270W
FSBH0F70WA
VDS=350 V, ID=1.0 A
FSBH0170W
FSBH0270W
FSBH0F70WA
VDS=350 V, ID=1.0 A
FSBH0170W
FSBH0270W
14.00
8.80
6.00
162
250
550
18
25
38
3.8
10
17
9.5
12.0
20.0
19
4
15
33.0
30.0
55.0
42
10
25
50
200
19.00
11.00
7.20
211
325
715
24
33
50
5.7
15
26
29.0
34.0
50.0
48
18
40
76.0
70.0
120.0
94
30
60
μA
Ω
pF
pF
pF
ns
ns
ns
ns
Continued on the following page…
© 2011 Fairchild Semiconductor Corporation
FSBH0F70WA/0170W/0270W • Rev. 1.0.3
6
www.f airchildsemi.com

6 Page









FSBH0170W pdf, datenblatt
Green-Mode Operation
The FSBH-series uses feedback voltage (VFB) as an
indicator of the output load and modulates the PWM
frequency, as shown in Figure 26, such that the
switching frequency decreases as load decreases . In
heavy-load conditions, the switching frequency is
100 kHz. Once VFB decreases below VFB-N (2.5 V), the
PWM frequency starts to linearly decrease from
100 kHz to 18 kHz to reduce switching losses. As VFB
decreases below VFB-G (2.0 V), the switching frequency is
fixed at 18 kHz and the FSBH-series enters “deep” green
mode to reduce the standby power consumption.
Frequency
100kHz
PWM
Frequency
18kHz
VFB-ZDC
VFB-G
VFB-N
VFB
Figure 26. PWM Frequency
As VFB decreases below VFB-ZDC (1.6 V), the FSBH-
series enters burst-mode operation. When VFB drops
below VFB-ZDC, FSBH-series stops switching and the
output voltage starts to drop, which causes the feedback
voltage to rise. Once VFB rises above VFB-ZDC, switching
resumes. Burst mode alternately enables and disables
switching, thereby reducing switching loss to improve
power saving, as shown in Figure 27.
VO
VFB
VFB.ZDC
(1.6V)
IDrain
VLMT
0.80
0.63
0.5 1.2
3.6 4.0
VIN
Figure 28. Constant Power Control
Protections
The FSBH-series provides full protection functions to
prevent the power supply and the load from being
damaged. The protection features include:
Open-Loop / Overload Protection (OLP)
When the upper branch of the voltage divider for the
shunt regulator (KA431 shown) is broken, as shown in
Figure 29, or over current or output short occurs, there
is no current flowing through the opto-coupler transistor,
which pulls the feedback voltage up to 6 V.
When feedback voltage is above 4.6 V for longer than
56 ms, OLP is triggered. This protection is also triggered
when the SMPS output drops below the nominal value
longer than 56 ms due to the overload condition.
VDD Over-Voltage Protection (OVP)
VDD over-voltage protection prevents IC damage caused
by over voltage on the VDD pin. The OVP is triggered
when VDD voltage reaches 28 V. Debounce time (typically
130 µs) prevents false trigger by switching noise.
Over-Temperature Protection (OTP)
The SenseFET and the control IC are integrated,
making it easier to detect the temperature of the
SenseFET. As the temperature exceeds approximately
142°C, thermal shutdown is activated.
6V
Switching
Disabled
Switching
Disabled
Figure 27. Burst-Mode Operation
H/L Line Over-Power Compensation
To limit the output power of the converter constantly,
high/low line over-power compensation is included.
Sensing the converter input voltage through the VIN pin,
the high/low line compensation function generates a
relative peak-current-limit threshold voltage for constant
power control, as shown in Figure 28.
Vo
VFB
2
PWM
3R
KA431
R
Feedback Open
Loop
VFB
4.6V
56ms OLP
6V
VFB-OLP (4.6V)
© 2011 Fairchild Semiconductor Corporation
FSBH0F70WA/0170W/0270W • Rev. 1.0.3
OLP Shutdown Delay Time OLP Triggers
56ms
Figure 29. OLP Operation
www.f airchildsemi.com
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