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| 型号： | FSCQ1265RTYDTU |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 15/36页 |
| 文件大小： | 0K |
| 描述： | IC SWIT PWM GREEN OVP HV TO220 |
| 标准包装： | 400 |
| 输出隔离： | 隔离 |
| 频率范围： | 18kHz ~ 22kHz |
| 输入电压： | 9 V ~ 20 V |
| 输出电压： | 650V |
| 功率（瓦特）： | 170W |
| 工作温度： | 25°C ~ 150°C |
| 封装/外壳： | TO-220-5 全封装（成形引线） |
| 供应商设备封装： | TO-220F-5L（成形） |
| 包装： | 管件 |
| 产品目录页面： | 1219 (CN2011-ZH PDF) |
| 其它名称： | FSCQ1265RTYDTU_NL FSCQ1265RTYDTU_NL-ND |
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Vds
V CC
I delay
V ref
I FB
2V RO
V O
V fb
H11A817A
C B
4
D1
D2
2.5R
OSC
SenseFET
+
Gate
V fb *
R
Driver
Vsyn
c
KA431
-
V SD
OLP
R sense
4.6V
2.6V
3V
1.8V
Figure 32.
Pulse Width Modulation (PWM) Circuit
MOSFET Gate
4. Protection Circuits : The FSCQ series has several
self-protective functions such as overload protection
(OLP), abnormal over-current protection (AOCP), over-
ON
Figure 31.
ON
Extended QR Operation Waveforms
voltage protection (OVP), and thermal shutdown (TSD).
OLP and OVP are auto-restart mode protections, while
TSD and AOCP are latch mode protections. Because
these protection circuits are fully integrated into the IC
without external components, the reliability can be
3. Feedback Control : The FSCQ series employs
current mode control, as shown in Figure 32. An opto-
coupler (such as Fairchild’s H11A817A) and shunt
regulator (such as Fairchild’s KA431) are typically used
to implement the feedback network. Comparing the
feedback voltage with the voltage across the R sense
resistor, plus an offset voltage, makes it possible to
control the switching duty cycle. When the reference pin
voltage of the shunt regulator exceeds the internal
reference voltage of 2.5 V, the opto-coupler LED current
increases, pulling down the feedback voltage and
reducing the duty cycle. This typically occurs when input
voltage is increased or output load is decreased.
improved without increasing cost.
- Auto-Restart Mode Protection : Once the fault
condition is detected, switching is terminated and
the SenseFET remains off. This causes V CC to fall.
When V CC falls to the under voltage lockout (UVLO)
stop voltage of 9 V, the protection is reset and the
FSCQ series consumes only startup current
(25 μA). Then, the V CC capacitor is charged up,
since the current supplied through the startup
resistor is larger than the current that the FPS
consumes. When V CC reaches the start voltage of
15 V, the FSCQ series resumes its normal
operation. If the fault condition is not removed, the
3.1 Pulse-by-Pulse Current Limit : Because current
mode control is employed, the peak current through the
SenseFET is limited by the inverting input of the PWM
comparator (V fb *) as shown in Figure 32. The feedback
current (I FB ) and internal resistors are designed so that
the maximum cathode voltage of diode D 2 is about
-
SenseFET remains off and VCC drops to stop
voltage again. In this manner, the auto-restart can
alternately enable and disable the switching of the
power SenseFET until the fault condition is
Latch Mode Protection : Once this protection is
2.8 V, which occurs when all IFB flows through the
triggered,
switching is terminated
and the
internal resistors. Since D 1 is blocked when the
feedback voltage (V fb ) exceeds 2.8 V, the maximum
voltage of the cathode of D 2 is clamped at this voltage,
thus clamping V fb *. Therefore, the peak value of the
current through the SenseFET is limited.
3.2 Leading Edge Blanking (LEB) : At the instant the
internal SenseFET is turned on, there is usually a high
current spike through the SenseFET, caused by the
external resonant capacitor across the MOSFET and
secondary-side rectifier reverse recovery. Excessive
voltage across the R sense resistor can lead to incorrect
feedback operation in the current mode PWM control.
To counter this effect, the FSCQ series employs a
leading edge blanking (LEB) circuit. This circuit inhibits
the PWM comparator for a short time (t LEB ) after the
Sense FET is turned on.
? 2006 Fairchild Semiconductor Corporation
FSQ-Series ? Rev. 1.1.3
15
SenseFET remains off until the AC power line is
unplugged. Then, V CC continues charging and
discharging between 9 V and 15 V. The latch is
reset only when V CC is discharged to 6 V by
unplugging the AC power line.
www.fairchildsemi.com
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| FSCQ1465RT | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Green Mode Fairchild Power Switch (FPS⑩) |
| FSCQ1465RTYDTU | 功能描述:电源开关 IC - 配电 POWER_CONVERSION RoHS:否 制造商:Exar 输出端数量:1 开启电阻（最大值）:85 mOhms 开启时间（最大值）:400 us 关闭时间（最大值）:20 us 工作电源电压:3.2 V to 6.5 V 电源电流（最大值）: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOT-23-5 |
| FSCQ1565RP | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Green Mode Fairchild Power Switch (FPS TM) |
| FSCQ1565RPSYDTU | 功能描述:电源开关 IC - 配电 15A/650V QRC Power Switch RoHS:否 制造商:Exar 输出端数量:1 开启电阻（最大值）:85 mOhms 开启时间（最大值）:400 us 关闭时间（最大值）:20 us 工作电源电压:3.2 V to 6.5 V 电源电流（最大值）: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOT-23-5 |
| FSCQ1565RPVDTU | 功能描述:电源开关 IC - 配电 15A/650V QRC Pwr Sw RoHS:否 制造商:Exar 输出端数量:1 开启电阻（最大值）:85 mOhms 开启时间（最大值）:400 us 关闭时间（最大值）:20 us 工作电源电压:3.2 V to 6.5 V 电源电流（最大值）: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOT-23-5 |
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