FSBH0F70A, FSBH0170/A, FSBH0270/A, FSBH0370 — Green Mode Fairchild Power Switch (FPS™)
April 2010
FSBH0F70A, FSBH0170/A, FSBH0270/A, FSBH0370
Green Mode Fairchild Power Switch (FPS™)
Features
Brownout Protection with Hysteresis
Built-In 5ms Soft-Start Function
Internal Avalanche-Rugged 700V SenseFET
No Acoustic Noise During Light-Load Operation
High-Voltage Startup
Linearly Decreasing PWM Frequency to 18KHz
Peak-Current-Mode Control
Cycle-by-Cycle Current Limiting
Leading-Edge Blanking (LEB)
Synchronized Slope Compensation
Internal Open-Loop Protection
V
DD
Under-Voltage Lockout (UVLO)
V
DD
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
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 V
FB
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 90V
AC
to 264V
AC
.
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 V
DD
drops below the V
TH-OLP
, then the
controller starts up again. As long as V
DD
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.
Applications
General-purpose switch-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
© 2009 Fairchild Semiconductor Corporation
FSBH0F70A, FSBH0170/A, FSBH0270/A, FSBH0370 • Rev. 1.0.3
www.fairchildsemi.com
FSBH0F70A, FSBH0170/A, FSBH0270/A, FSBH0370 — Green Mode Fairchild Power Switch (FPS™)
Pin Configuration
8
8
ZXYTT
BH0F70A
TPM
1
1
ZXYTT
BH0170A
TPM
F
– Fairchild Logo
Z
– Plant Code
X
– 1-Digit Year Code
Y
– 1-Digit Week Code
TT
– 2-Digit Die Run Code
T
– Package Type (N:DIP)
P
– Y: Green Package
M
– Manufacture Flow Code
8
8
ZXYTT
BH0270A
TPM
1
1
ZXYTT
BH0170
TPM
8
8
ZXYTT
BH0270
TPM
1
1
ZXYTT
BH0370
TPM
Figure 4. Pin Configuration and Top Mark Information
Pin Definitions
Pin #
1
2
3
Name
GND
VDD
FB
VIN
NC
Description
Ground.
SenseFET source terminal on primary side and internal controller ground.
Power Supply.
The internal protection circuit disables PWM output as long as V
DD
exceeds the
OVP trigger point.
Feedback.
The signal from the external compensation circuit is fed into this pin. The PWM duty
cycle is determined in response to the signal on this pin and the internal current-sense signal.
Line-Voltage Detection.
The line-voltage detection is used for brownout protection with
hysteresis and constant output power limit over universal AC input range. This pin has additional
protections that are pull-HIGH latch and pull-LOW auto recovery, depending on the application.
No Connection for FSBH0F70A, FSBH0170A and FSBH0270A.
Startup.
For startup, this pin is pulled HIGH to the line input or bulk capacitor via resistors.
SenseFET Drain.
High-voltage power SenseFET drain connection.
SenseFET Drain.
High-voltage power SenseFET drain connection.
SenseFET Drain.
High-voltage power SenseFET drain connection.
4
5
6
7
8
HV
Drain
Drain
Drain
© 2009 Fairchild Semiconductor Corporation
FSBH0F70A, FSBH0170/A, FSBH0270/A, FSBH0370 • Rev. 1.0.3
www.fairchildsemi.com
4
FSBH0F70A, FSBH0170/A, FSBH0270/A, FSBH0370 — Green Mode Fairchild Power Switch (FPS™)
Absolute Maximum Ratings
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be
operable above the recommended operating conditions and stressing the parts to these levels is not recommended.
In addition, extended exposure to stresses above the recommended operating conditions may affect device
reliability. The absolute maximum ratings are stress ratings only.
Symbol
V
DRAIN
Drain Pin Voltage
(5,6)
Parameter
FSBH0x70/A
FSBH0F70A
FSBH0170/A
FSBH0270/A
FSBH0370
FSBH0F70A
FSBH0170/A
FSBH0270/A
FSBH0370
Min.
Max.
700
1.5
4.0
8.0
12.0
10
50
140
230
30
Unit
V
I
DM
Drain Current Pulsed
(7)
A
E
AS
Single Pulsed Avalanche Energy
(8)
mJ
V
DD
V
FB
V
IN
V
HV
P
D
θ
JA
θ
JC
T
J
T
STG
T
L
ESD
DC Supply Voltage
FB Pin Input Voltage
VIN Pin Input Voltage
HV Pin Input Voltage
Power Dissipation (T
A
＜50°C)
Junction-to-Air Thermal Resistance
Junction-to-Case Thermal Resistance
Operating Junction Temperature
Storage Temperature Range
Lead Temperature (Wave Soldering or IR, 10 Seconds)
Electrostatic Discharge Capability,
All pins except HV pin
Human Body Model:
JESD22-A114
Charged Device Model:
JESD22-C101
3
-55
-0.3
-0.3
V
V
V
V
W
°C/W
°C/W
°C
°C
°C
kV
7.0
7.0
700
1.5
80
20
Internally limited
(9)
+150
+260
1
Notes:
5. All voltage values, except differential voltages, are given with respect to the network ground terminal.
6. Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device.
7. Non-repetitive rating: pulse width is limited by maximum junction temperature.
8. L = 51mH, starting T
J
= 25°C.
9. Internally Limited of T
J
refers to T
OTP
Recommended Operating Conditions
The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended
operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not
recommend exceeding them or designing to Absolute Maximum Ratings.
Symbol
T
A
Parameter
Operating Ambient Temperature
Conditions
Min.
-40
Typ.
Max.
+105
Unit
°C
© 2009 Fairchild Semiconductor Corporation
FSBH0F70A, FSBH0170/A, FSBH0270/A, FSBH0370 • Rev. 1.0.3
www.fairchildsemi.com
5
PCB Design
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