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参数资料
| 型号： | PWM5031-001-2S |
| 元件分类： | 稳压器 |
| 英文描述： | 1 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, CDSO24 |
| 封装： | 0.600 X 0.300 INCH, 0.130 INCH HEIGHT, HERMETIC SEALED, CERAMIC, SOP-24 |
| 文件页数： | 5/19页 |
| 文件大小： | 236K |
| 代理商： | PWM5031-001-2S |
13
SCD5031 Rev L 11/3/08
Aeroflex Plainview
AUXILIARY AMPLIFIER
The chip includes an uncommitted op-amp with independent shutdown feature for use in any user-defined application.
Some possibilities are:
◆
Signal conditioning of an isolated configuration feedback voltage
◆
Implementation of more sophisticated compensation networks for control loop optimization
The Auxiliary amplifier has a unity gain bandwidth greater than 1MHz and an open loop gain greater than 100dB. The
ENAUX pin is active high such that a logic ''1'' enables the amplifier and logic ''0'' disables it. The amplifier has near
rail-to-rail capability on both the input and output.
A typical single output forward converter application is shown in Figure 9 to aid in the following operational description.
During normal operation, the oscillator jumpstarts each switching cycle by resetting the RS latch, causing the output
stage to go high and turn on M1. Current begins to build linearly through T1 and M1 and a proportional voltage is
developed across the small sense resistor Rs. Switching spikes are filtered by C1 and R1, and the resulting sawtooth
waveform is passed into the PWM to serve as the current comparator input. Meanwhile, a portion of the output voltage
is sensed and compared to the PWM’s internal precision 2.5V reference. The difference is then amplified and level
shifted to serve as the comparator threshold. When the voltage on the ISENSE pin exceeds this threshold, the comparator
fires and resets the latch. The output then turns off until the beginning of the next oscillator cycle when the process
repeats.
FIGURE 8 – Output Sink and Source Saturation Characteristics at +25°C
VSAT
110
mV
500
400
300
200
0
600
100
Current mA
100
5031
5032
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