參數(shù)資料
型號(hào)： 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(yè)數(shù)： 9/48頁(yè)
文件大?。?/td> 768K
代理商： L6566BH
L6566BH
Application information
Doc ID 16610 Rev 1
17/48
With reference to the timing diagram of Figure 6, when power is first applied to the converter
the voltage on the bulk capacitor (Vin) builds up and, at about 80 V, the HV generator is
enabled to operate (HV_EN is pulled high) so that it draws about 1 mA. This current, minus
the device’s consumption, charges the bypass capacitor connected from pin Vcc (5) to
ground and makes its voltage rise almost linearly.
Figure 6.
Timing diagram: normal power-up and power-down sequences
As the Vcc voltage reaches the turn-on threshold (14 V typ.) the device starts operating and
the HV generator is cut off by the Vcc_OK signal asserted high. The device is powered by
the energy stored in the Vcc capacitor until the self-supply circuit (typically an auxiliary
winding of the transformer and a steering diode) develops a voltage high enough to sustain
the operation. The residual consumption of this circuit is just the one on the 15 M
Ω resistor
(
≈10 mW at 400 Vdc), typically 50-70 times lower, under the same conditions, as compared
to a standard start-up circuit made with external dropping resistors.
At converter power-down the system will lose regulation as soon as the input voltage is so
low that either peak current or maximum duty cycle limitation is tripped. Vcc will then drop
and stop IC activity as it falls below the UVLO threshold (10 V typ.). The Vcc_OK signal is
de-asserted as the Vcc voltage goes below a threshold VCCrest located at about 5V. The HV
generator can now restart. However, if Vin < Vinstart, as illustrated in Figure 6, HV_EN is de-
asserted too and the HV generator is disabled. This prevents converter’s restart attempts
and ensures monotonic output voltage decay at power-down in systems where brownout
protection (see the relevant section) is not used.
The low restart threshold VCCrest ensures that, during short circuits, the restart attempts of
the device will have a very low repetition rate, as shown in the timing diagram of Figure 7 on
, and that the converter will work safely with extremely low power throughput.
Vcc
(pin 5)
GD
(pin 4)
HV_EN
VccON
VccOFF
Vccrestart
t
Vin
VHVstart
Icharge
0.85 mA
t
Vcc_OK
Power-on
Power-off
Normal
operation
regulation is lost here
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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(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)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(fēng)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(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)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(fēng)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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