STMicroelectronics 19V - 90W Adapter with PFC for Laptop computers using the L6563H and L6699 EVL6699-90WADP EVL6699-90WADP 데이터 시트
제품 코드
EVL6699-90WADP
Pin connections
L6699
6/38
Doc ID 022835 Rev 2
4 Pin
connections
Figure 2.
Pin connections (top view)
Table 4.
Pin functions
N.
Name
Function
1
C
SS
Soft-start. This pin connects an external capacitor to GND and a resistor to
RF
RF
min
(pin 4) that set both the initial oscillator frequency and the time constant
for the frequency shift that occurs as the chip starts up (soft-start). An internal
switch discharges this capacitor every time the chip turns off (V
switch discharges this capacitor every time the chip turns off (V
CC
< UVLO,
LINE < 1.25 V, DIS > 1.85 V, ISEN > 1.5 V, DELAY > 2 V) to make sure it is soft-
started next. Additionally the switch is activated when the voltage on the current
sense pin (ISEN) exceeds 0.8 V or when the converter is working too close to,
or in, the capacitive-mode operation.
started next. Additionally the switch is activated when the voltage on the current
sense pin (ISEN) exceeds 0.8 V or when the converter is working too close to,
or in, the capacitive-mode operation.
2
DELAY
Delayed shutdown upon overcurrent. A capacitor and a resistor are connected
from this pin to GND to set both the maximum duration of an overcurrent
condition before the IC stops switching and the delay after which the IC restarts
switching. Every time the voltage on the ISEN pin exceeds 0.8 V the capacitor
is charged by 350 µA current pulses and is slowly discharged by the external
resistor. If the voltage on the DELAY pin reaches 2 V, the soft-start capacitor is
completely discharged so that the switching frequency is pushed to its
maximum value and the 350 µA current source is kept always on. As the
voltage on the DELAY pin exceeds 3.5 V the IC stops switching and the internal
generator is turned off, so that the voltage on the pin decays because of the
external resistor. The IC is soft-restarted as the voltage drops below 0.3 V. In
this way, under short-circuit conditions, the converter works intermittently with
very low input average power.
from this pin to GND to set both the maximum duration of an overcurrent
condition before the IC stops switching and the delay after which the IC restarts
switching. Every time the voltage on the ISEN pin exceeds 0.8 V the capacitor
is charged by 350 µA current pulses and is slowly discharged by the external
resistor. If the voltage on the DELAY pin reaches 2 V, the soft-start capacitor is
completely discharged so that the switching frequency is pushed to its
maximum value and the 350 µA current source is kept always on. As the
voltage on the DELAY pin exceeds 3.5 V the IC stops switching and the internal
generator is turned off, so that the voltage on the pin decays because of the
external resistor. The IC is soft-restarted as the voltage drops below 0.3 V. In
this way, under short-circuit conditions, the converter works intermittently with
very low input average power.
If the voltage on the ISEN pin exceeds 1.5 V, the L6699 is immediately stopped
and the 350 µA current source is kept on until the voltage on the DELAY pin
reaches 3.5 V. Then, the generator is turned off and the voltage on the pin
decays because of the external resistor. Also in this case the IC is soft-restarted
as the voltage drops below 0.3 V.
and the 350 µA current source is kept on until the voltage on the DELAY pin
reaches 3.5 V. Then, the generator is turned off and the voltage on the pin
decays because of the external resistor. Also in this case the IC is soft-restarted
as the voltage drops below 0.3 V.
3
CF
Timing capacitor. A capacitor connected from this pin to GND is charged and
discharged by internal current generators programmed by the external network
connected to pin 4 (RF
discharged by internal current generators programmed by the external network
connected to pin 4 (RF
min
) and determines the switching frequency of the
converter.
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