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參數(shù)資料
| 型號： | L6566B |
| 廠商： | 意法半導體 |
| 英文描述： | Multi-mode controller for SMPS |
| 中文描述： | 多模式開關電源控制器 |
| 文件頁數(shù)： | 18/51頁 |
| 文件大?。?/td> | 401K |
| 代理商： | L6566B |
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Application information
L6566B
18/51
If FF operation is selected:
1.
FF mode from heavy to light load. The system operates exactly like a standard current
mode control, at a frequency f
sw
determined by the externally programmable oscillator:
both DCM and CCM transformer operation are possible, depending on whether the
power that it processes is greater or less than:
Equation 1
where Vin is the input voltage to the converter, V
R
the reflected voltage (i.e. the
regulated output voltage times the primary-to-secondary turn ratio) and Lp the
inductance of the primary winding. Pin
T
is the power level that marks the transition from
continuous to discontinuous operation mode of the transformer.
Burst-mode with no or very light load. This kind of operation is activated in the same
way and results in the same behavior as previously described for QR operation.
2.
The L6566B is specifically designed for applications with no PFC front-end; pin 6 (FMOD)
features an auxiliary oscillator that can modulate the switching frequency (when FF
operation is selected) in order to mitigate EMI emissions by a spread-spectrum action.
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 M
resistor,
with a temperature-compensated current generator connected to its source.
Figure 5.
High-voltage start-up generator: internal schematic
Lp
f
2
V
Vin
V
Vin
Pin
sw
2
R
R
T
+
=
L6566B
15 M
GND
HV
Vcc
5
3
1
I
charge
Vcc_OK
I
HV
CONTROL
HV_EN
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| 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(shù)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(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 |
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