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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： | 18/19页 |
| 文件大小： | 236K |
| 代理商： | PWM5031-001-2S |
8
SCD5031 Rev L 11/3/08
Aeroflex Plainview
OSCILLATOR
The chip uses two precision current mirrors that alternately charge and discharge an external capacitor to generate an
extremely linear sawtooth oscillator waveform. At the start of each cycle, the charging current, set by the choice of
resistor at the Rset pin, is 1:1 mirrored over to the Cset pin where it charges an external capacitor. When the capacitor
voltage reaches the comparator’s upper threshold (nominally VREF), the comparator switches current mirrors and begins
to discharge the external capacitor. The discharge current is set at roughly five times the charging current to result in fast
discharge and minimal Dead Time. When the voltage reaches the comparator’s lower threshold (0.9V), the comparator
switches back to the charging mirror, powers down the discharge mirror, and the whole process repeats.
The frequency is set by choosing Rset and Cset such that:
Suggested Ranges for Cset and Rset are:
50K ohms < Rset < 300K
10pf < Cset < 600pF
Rt
Ct
Rset
Cset
GND
6
7
12
F
OSC
1
0.84
R
SET
×
C
SET
×
------------------------------------------------
≈
20KHz
F
OSC
1MHz
≤≤
FIGURE 3 – Timing Resistance vs Frequency
47pF
100pF
200pF
390pF
200pF
20pF
10pF
10K
100K
Frequency Hz
RSET
Ω
160K
140K
120K
100K
80K
60K
40K
1M
Frequency Hz
300K
280K
260K
240K
220K
200K
180K
320K
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