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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)： | 27/51頁 |
| 文件大?。?/td> | 624K |
| 代理商： | L6566BTR |
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L6566B
Application information
33/51
This function is useful to implement a latched overtemperature protection very easily by
biasing the pin with a divider from VREF, where the upper resistor is an NTC physically
located close to a heating element like the MOSFET, or the transformer. The DIS pin is a
high impedance input, thus it is prone to pick up noise, which might give origin to undesired
latch-off of the device. It is possible to bypass the pin to ground with a small film capacitor
(e.g. 1-10 nF) to prevent any malfunctioning of this kind.
Figure 20.
Operation after latched disable activation: timing diagram
5.10
Soft-start and delayed latched shutdown upon overcurrent
At device start-up, a capacitor (CSS) connected between the SS pin (14) and ground is
charged by an internal current generator, ISS1, from zero up to about 2 V where it is
clamped. During this ramp, the overcurrent setpoint progressively rises from zero to the
value imposed by the voltage on the VFF pin (15, see Section 5.6: PWM comparator, PWM
); MOSFET’s conduction time increases
gradually, hence controlling the start-up inrush current. The time needed for the overcurrent
setpoint to reach its steady state value, referred to as soft-start time, is approximately:
Equation 12
During the ramp (i.e. until VSS = 2 V) all the functions that monitor the voltage on pin COMP
are disabled.
Vcc
(pin 5)
GD
(pin 4)
Vin
VccON
VccON -0.5
t
4.5V
VccOFF
DIS
(pin 8)
Vccrestart
VHVstart
HV generator is turned on
HV generator turn-on is disabled here
Input source is removed here
t
AC_OK
(pin 16)
Vth
Disable latch is reset here
Restart is quicker
=
3
V
1
I
Css
)
V
(
V
I
Css
T
VFF
1
SS
VFF
csx
1
SS
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