APW7067N 查看數據表（PDF） - Anpec Electronics
零件编号
产品描述 (功能)
比赛名单
APW7067N Datasheet PDF : 24 Pages
| |||
APW7067N
Function Description (Cont.)
Under Voltage Protection (Cont.)
and low-side MOSFET and the converter’s output is
latched to be floating.
Shutdown and Enable
Pulling the FS_DIS voltage to GND by an open drain
transistor, shown in typical application circuit,
shutdown the APW7067N PWM controller. In shutdown
mode, the UGATE and LGATE turn off and pull to PHASE
and GND respectively.
Switching Frequency
The APW7067N provides the adjustable oscillator
switching frequency . The switching frequency is determined
by the value of R (from FS_DIS pin to GND), the
FS_DIS
adjustable range from150kHz to 1000kHz .
Figure 3. shows how to select the resistor for the
desired frequency. If the IC is operated in higher
frequencies (ex. 600 kHz or above), the slope of the
curve is steep, and a small change in resistance will
have a big effect on the frequency. At lower frequencies,
the slope of the curve is much less steep, even a large
change in resistor value doesn’t change the frequency
too much. Figure 4. shows more detail for the higher
frequency and Figure5. shows the lower frequency.
1600
1400
1200
1000
800
600
400
200
0
0 100 200 300 400 500 600 700 800
R (KΩ )
Figure 3. Oscillator Frequency vs. R
FS-DIS
1200
1000
800
600
400
0 10 20 30 40 50 60 70 80
R (KΩ )
Figure 4. Oscillator Frequency vs.R
FS-DIS
(High Frequency)
500
450
400
350
300
250
200
150
100
50 150 250 350 450 550 650 750
R (KΩ )
Figure 5. Oscillator Frequency vs.R
FS-DIS
(Low Frequency)
Copyright © ANPEC Electronics Corp.
13
Rev. A.3 - Mar., 2008
www.anpec.com.tw
Share Link: 