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參數(shù)資料
| 型號： | L6591TR |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, PDSO16 |
| 封裝： | ROHS COMPLIANT, SOP-16 |
| 文件頁數(shù)： | 5/32頁 |
| 文件大?。?/td> | 560K |
| 代理商： | L6591TR |
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L6591
Application information
Doc ID 14821 Rev 4
13/32
5.1
High-voltage start-up generator
Figure 5 shows the internal schematic of the high-voltage start-up generator (HV generator).
It is made up of a high-voltage N-channel FET, whose gate is biased by a 15 MW resistor,
with a temperature-compensated current generator connected to its source.
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, as it reaches about 80 V, the HV
generator is enabled to operate (HV_EN is pulled high) and draws about 1 mA. This current,
diminished by the IC consumption, charges the bypass capacitor connected between pin
Vcc (9) and ground and makes its voltage rise almost linearly.
As the Vcc voltage reaches the start-up threshold (13.5 V typ.) the IC starts operating and
the HV generator is cut off by the Vcc_OK signal asserted high. The IC is powered by the
energy stored in the Vcc capacitor until the self-supply circuit develops a voltage high
enough to sustain the operation. The residual consumption of this circuit is just the one on
the 15 MW 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 an external dropping
resistor.
Figure 5.
High-voltage start-up generator: internal schematic
L6591
15 M
&
GN D
HVSTART
Vcc
9
11
16
Icharge
Vcc_OK
I HV
CONTROL
HV_EN
Ω
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L6598 | 功能描述:PMIC 解決方案 High Volt Reson Cont RoHS:否 制造商:Texas Instruments 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-24 封裝:Reel |
| L6598_04 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:HIGH VOLTAGE RESONANT CONTROLLER |
| L6598D | 功能描述:PMIC 解決方案 High Volt Reson Cont RoHS:否 制造商:Texas Instruments 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-24 封裝:Reel |
| L6598D013TR | 功能描述:PMIC 解決方案 High Volt Reson Cont RoHS:否 制造商:Texas Instruments 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-24 封裝:Reel |
| L6598D016TR | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:High voltage resonant controller |
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