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參數(shù)資料
| 型號： | L6566BTR |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.8 A POWER FACTOR CONTROLLER, 900 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | LEAD FREE, SOP-16 |
| 文件頁數(shù)： | 10/51頁 |
| 文件大?。?/td> | 624K |
| 代理商： | L6566BTR |
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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 fsw 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, VR the reflected voltage (i.e. the
regulated output voltage times the primary-to-secondary turn ratio) and Lp the
inductance of the primary winding. PinT is the power level that marks the transition from
continuous to discontinuous operation mode of the transformer.
2.
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.
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
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
Ω 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
T
+
=
L6566B
15 M
GND
HV
Vcc
5
3
1
Icharge
Vcc_OK
IHV
CONTROL
HV_EN
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