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参数资料
| 型号： | PWM5032-DIE |
| 元件分类： | 稳压器 |
| 英文描述： | 1 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, UUC |
| 封装： | DIE |
| 文件页数： | 8/19页 |
| 文件大小： | 220K |
| 代理商： | PWM5032-DIE |
16
SCD5031 Rev J 4/4/08
Aeroflex Plainview
5V to 1.8V Buck Converter
A second application is a secondary side, non-isolated buck converter. The circuit takes a high voltage (5V in this case)
and steps down to a lower voltage (5V to 1.8V in this example, although as pointed out above, these values are
completely adjustable with proper component selection). If the output voltage is less than 2.5V the auxiliary amplifier
can be used to provide the gain necessary to get VFB back up to 2.5V.
FIGURE 11 – Buck Converter
The circuit switches M1 twice per cycle, chopping the 5VDC input into a fixed frequency pulse train whose DC average
is the desired output voltage. The LC filter then simply smoothes this pulse train to produce a clean DC output. The
control loop regulates against operating point perturbations (temperature, line, load) by adjusting M1's duty cycle. The
circuit is operated in the voltage mode since switch current is not referenced to circuit ground. Alternatively, a current
transformer may be used to properly reference the ISENSE signal to permit current mode control. An inverter is needed in
the output path to properly drive the P-channel MOSFET. For low current applications (less than -50mA output current),
it may be possible to use the PWM's output drive stage as the switching elements and eliminate M1 and D1 altogether.
RSET
CSET
INPUT 5V
Rcomp
1V/1.8V/2.5V/3.3V
M1
OUTPUT
RSOFT
CSOFT
Ccomp
0.1F
RSET
CSET
VEE DRVN
VFB
COMP
50%
ISENSE
Out A
VCC
DRVP
SOFT
VREF
D1
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