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參數資料
| 型號： | L6566ATR |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩壓器 |
| 英文描述： | 0.8 A POWER FACTOR CONTROLLER WITH POST REGULATOR, 300 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | LEAD FREE, SOP-16 |
| 文件頁數： | 11/51頁 |
| 文件大小： | 646K |
| 代理商： | L6566ATR |
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L6566A
Application information
19/51
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 start-up threshold (14 V typ.) the low-voltage chip 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 Vccrestart located at about 5 V. The
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 Vccrestart 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
Vcc_PFC
(pin 6)
heavy load
light load
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相關代理商/技術參數 |
參數描述 |
|---|---|
| L6566B | 功能描述:開關變換器、穩壓器與控制器 Multi Mode PWM Controller RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| L6566B_08 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Multi-mode controller for SMPS |
| L6566BH | 功能描述:電流型 PWM 控制器 Multimode Controller SMPS 800V <3mA RoHS:否 制造商:Texas Instruments 開關頻率: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 輸出端數量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| 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 輸出端數量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
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