Does your circuit require a controlled input voltage? Try using Texas Instruments&s; SG3524D voltage mode PWM controller today. Its 2 PWM outputs produce a current of 100(Max) mA. This voltage mode driver supports boost|buck|flyback|forward|full-bridge|half-bridge|push-pull topology. It has a switching frequency of 450(Typ) kHz. In order to ensure parts aren&s;t damaged by bulk packaging, this product comes in tube packaging to add a little more protection by storing the loose parts in an outer tube. This device has a minimum operating supply voltage of 8 V and a maximum of 40 V. This voltage mode driver&s;s maximum duty cycle is 45(Min) %. This voltage mode driver has a minimum operating temperature of 0 В°C and a maximum of 70 В°C.