参数资料
型号: AN1082
厂商: Intersil Corporation
英文描述: Using the ISL6401 RSLIC PWM Controller Evaluation Board
中文描述: RSLIC使用ISL6401 PWM控制器评估板
文件页数: 3/8页
文件大小: 245K
代理商: AN1082
3
Output Performance
Output Ripple -
Figure 2 shows the output voltage ripple for
VOUT1 and VOUT2 both at 100mA load.
Transient Response -
Figure 3 and Figure 4 show the
transient performance of the each output for a step load from
0mA to 100mA.
Oscillator
Switching Frequency -
The gate driver output switching
frequency can be programmed from 50kHz to 600kHz by
adjusting the capacitor value on the CT pin (C5). Figure 5
can be used as a guideline in selecting the capacitor value
required for a given frequency.
External Synchronization -
The internal oscillator can be
synchronized by an external clock connected to the SYNC
pin (P6). Program the free running frequency of the oscillator
to be 10% slower than the desired synchronous frequency.
The external clock signal should have a minimum pulse
width of 20ns.
Shutdown
When the SD pin (P5) is pulled low, the PWM is turned off
and the output capacitors discharge. A typical shutdown
waveform using the SD pin is shown in Figure 6.
Conclusion
The ISL6401EVAL1evaluation board is a flyback reference
design optimized to provide a high performance, low-cost
solution for RSLIC Ring and Talk power supplies in VoIP
application. It has the capablility of evaluating device operation
with loads that simulate one, two, three, or four line operation.
References
1. ISL6401 Datasheet, Intersil Corporation, File No. FN9007
For Intersil documents available on the web, see
http://www.intersil.com/
FIGURE 2. OUTPUT 1 AND 2 RIPPLE VOLTAGE
VOUT1
20mV/DIV
VOUT2
20mV/DIV
10us/DIV
FIGURE 3. VOUT1 TRANSIENT RESPONSE
VOUT1
50mV/DIV
IOUT1
50mA/DIV
2ms/DIV
FIGURE 4. VOUT2 TRANSIENT RESPONSE
VOUT2
200mV/DIV
IOUT2
50mA/DIV
2ms/DIV
CAPACITANCE (pF)
82
120
180
250
600
500
400
300
200
100
0
F
300
390
510
610
820
1200
FIGURE 5. OUTPUT SWITCHING FREQUENCY vs CT
VOUT1
20V/DIV
VOUT2
20V/DIV
10ms/DIV
FIGURE 6. OUTPUT SHUTDOWN WAVEFORMS
Application Note 1082
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