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零件编号 | FSBH0270 | ||
描述 | Green Mode Fairchild Power Switch | ||
制造商 | Fairchild Semiconductor | ||
LOGO | |||
1 Page
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
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 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
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
Electrical Characteristics (Continued)
VDD=15V and TA=25°C unless otherwise specified.
Symbol
Parameter
VFB-OPEN
VFB-N
VFB-G
VFB-ZDC
VFB-OLP
Output High Voltage
Green-Mode Entry FB Voltage
Green-Mode Ending FB Voltage
Zero Duty Cycle FB Voltage
FB Open-Loop
Trigger Level
FSBH0F70A
FSBH0x70/A
tD-OLP
FB Open-Loop Protection Delay
Current-Sense Section(14)
FSBH0F70A
FSBH0170/A
ILIM
Peak Current Limit
FSBH0270/A
FSBH0370
tSS Period During Soft-Start Time(10)
Condition
FB Pin Open
Min.
5.5
2.3
1.9
5.2
4.4
50
VIN Open
VIN = 1.2V / VIN Open
VIN = 1.2V / VIN Open
VIN = 1.2V
0.63
0.70
0.90
1.10
4.5
Typ.
2.5
2.0
1.6
5.4
4.6
56
0.73
0.80
1.00
1.20
5.0
Max.
2.7
2.1
5.6
4.8
59
0.83
0.90
1.10
1.30
5.5
Constant Power Limit (FSBH0170, FSBH0270, FSBH0370)
VLMT1
VLMT2
Threshold Voltage 1 for Current Limit
Threshold Voltage 2 for Current Limit
VIN = 1.2V
VIN = 3.6V
Current Limit (FSBH0F70A, FSBH0170A, FSBH0270A)
VLMT
Threshold Voltage for Current Limit
FSBH0F70A
FSBH0170A/0270A
0.73
0.56
0.97
0.77
0.80
0.63
1.00
0.80
0.87
0.70
1.03
0.83
Over-Temperature Protection Section (OTP)
TOTP
TRESTART
Protection Junction Temperature(10, 12)
Restart Junction Temperature(10, 13)
+135
+142
TOTP-25
+150
Notes:
10. These parameters, although guaranteed, are not 100% tested in production.
11. Pulse test: pulse width ≤ 300ìs, duty ≤ 2%.
12. When activated, the output is disabled and the latch is turned off.
13. The threshold temperature for enabling the output again and resetting the latch after over-temperature
protection has been activated.
14. These parameters, although guaranteed, are tested in wafer process.
Unit
V
V
V
V
V
V
ms
A
ms
V
V
V
V
°C
°C
PWM Frequency
fOSC
fOSC-G
VFB-ZDC VFB-G
VFB-N
Figure 5. VFB vs. PWM Frequency
© 2009 Fairchild Semiconductor Corporation
FSBH0F70A, FSBH0170/A, FSBH0270/A, FSBH0370 • Rev. 1.0.3
8
VFB
www.fairchildsemi.com
© 2009 Fairchild Semiconductor Corporation
FSBH0F70A, FSBH0170/A, FSBH0270/A, FSBH0370 • Rev. 1.0.3
16
www.fairchildsemi.com
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页数 | 16 页 | ||
下载 | [ FSBH0270.PDF 数据手册 ] |
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