[SG3524 buck converter]

Thanks a lot. I knw sg3524 is for voltage mode control. Actually i would like to use average current mode control as my buck converter feedback control. But i hav no experience in doing electronic project, i think it is better to start familiar with the PWM first so my friend recomend me try to use this sg3524.

What u means 'pins 12&13 tied to drain'??
What difference if i connect it to Vin?

My converter specification:
input: 10-15V
output: 5V
switching freqquency: 100kHz
output ripple: 1%

As u say bootstrap circuitry is onboard, can u please kindly suggest me which PWM it is?

[SG3524 buck converter]

here is the test circuit i refer from the datasheet

[SG3524 buck converter]

ya the RT & CT are not shorted, is my careless. thanks 4 ur remind.
because i am using n channel mosfet then the emiter pin should go ir2117 input; if use p channel then is collector go the input pin right?
is it correct nw?

[SG3524 buck converter]

i am using sg3524 to do my buck converter. i use ir2117 to drive my high side power mosfet (irf540). can anyone help me to check my open loop test circuit. to obtain duty cycle more than 50% pin11 & 14 were shorted is it? how about pin12 & 13?
thanks 4 ur help. ;)

[SG3524 buck converter]

i am using sg3524 to do my buck converter. i use ir2117 to drive my high side power mosfet (irf540). can anyone help me to check my open loop test circuit. to obtain duty cycle more than 50% pin11 & 14 were shorted is it? how about pin12 & 13?