| 摘要 |
The pulse-width modulator described herein comprises a square-wave generator, a retriggerable monostable multivibrator, a gate circuit and a controllable current source, having a capacitor as a timing element for the multivibrator. If the modulator is assembled from standard building blocks in CMOS-technology and several external components, its power dissipation will remain below 10 mW. If completed by a variable-gain amplifier - likewise carried out in CMOS-technology - and a reference voltage source, the pulse width modulator can be advantageously used in the control circuit of a clocked direct voltage converter. Then the internal losses of a direct voltage converter constructed thus will still remain below 25 mW. |
