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参数资料
| 型号： | L6566BH |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 300 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | ROHS COMPLIANT, SOP-16 |
| 文件页数： | 27/48页 |
| 文件大小： | 768K |
| 代理商： | L6566BH |
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L6566BH
Application information
Doc ID 16610 Rev 1
33/48
5.11
OVP block
The OVP function of the L6566BH monitors the voltage on the ZCD pin (11) in MOSFET’s
OFF-time, during which the voltage generated by the auxiliary winding tracks converter’s
output voltage. If the voltage on the pin exceeds an internal 5 V reference, a comparator is
triggered, an overvoltage condition is assumed and the device is shut down. An internal
current generator is activated that sources 1 mA out of the VFF pin (15). If the VFF voltage
is allowed to reach 2 Vbe over 5 V, the L6566BH will be latched off. See Section 5.9:
for more details on IC’s behavior under these
conditions. If the impedance externally connected to pin 15 is so low that the 5+2 VBE
threshold cannot be reached or if some means is provided to prevent that, the device will be
able to restart after the Vcc has dropped below 5 V. Refer to the “Application examples and
Ideas” section (Table 7 on page 42) for additional hints.
Figure 22.
OVP function: internal block diagram
The ZCD pin will be connected to the auxiliary winding through a resistor divider RZ1, RZ2
to:
Equation 13
where VoutOVP is the output voltage value that is to activate the protection, Ns the turn
number of the secondary winding and Naux the turn number of the auxiliary winding.
Fault
2-bit
counter
R Q1
S
Monostable
M1
STROBE
OVP
COUT
2 s
0.5 s
Monostable
M2
-
+
5 V
ZCD
Counter
reset
FF
40k
5pF
PWM latch
Q
S
R
11
to triggering
block
L6566BH
Naux
Ns
Vout
5
k
OVP
OVP =
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相关代理商/技术参数 |
参数描述 |
|---|---|
| L6566BHTR | 功能描述:电流型 PWM 控制器 MULTIMODE CONTROLLER SMPS 8V 3 mA RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| L6566BTR | 功能描述:电流型 PWM 控制器 MultiMode Controller for SMPS RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| L6566BTR-CUT TAPE | 制造商:ST 功能描述:L6566B Series 23 V 4.6 mA SMPS Multi-Mode Controller Surface Mount - SOIC-16N |
| L6567 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:HIGH VOLTAGE DRIVER FOR CFL |
| L6567D | 制造商:STMicroelectronics 功能描述:CFL DRVR 18V 14SOP - Rail/Tube |
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