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參數(shù)資料
| 型號： | L6566BTR |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | Multi-mode controller for SMPS |
| 中文描述： | 多模式開關(guān)電源控制器 |
| 文件頁數(shù)： | 33/51頁 |
| 文件大小： | 401K |
| 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, I
SS1
, from zero up to about 2V 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 latch
and voltage feedforward blocks on page 27
); 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 V
SS
= 2 V) all the functions that monitor the voltage on pin COMP
are disabled.
Vcc
(pin 5)
Vcc
ON
GD
(pin 4)
Vin
Vcc
ON
-0.5
Vcc
OFF
t
t
t
t
4.5V
DIS
(pin 8)
Vcc
restart
V
HVstart
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
SS
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