參數(shù)資料
型號： L6566BH
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, 300 kHz SWITCHING FREQ-MAX, PDSO16
封裝： ROHS COMPLIANT, SOP-16
文件頁數(shù)： 27/48頁
文件大?。?/td> 768K
代理商： L6566BH
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
(see Figure 8 on page 18). The divider ratio kOVP = RZ2 / (RZ1 + RZ2) will be chosen equal
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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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
L6566BHTR 功能描述:電流型 PWM 控制器 MULTIMODE CONTROLLER SMPS 8V 3 mA RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14
L6566BTR 功能描述:電流型 PWM 控制器 MultiMode Controller for SMPS RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體: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 制造商全稱: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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