The KA7500B is used for the control circuit of the PWM switching regulator. The KA7500B consists of 5V reference voltage circuit, two error amplifiers, flip flop, an output control circuit, a PWM comparator, a dead time comparator and an oscillator. This device can be operated in the switching frequency of 1 KHz to 300 KHz.

• Internal regulator provides a stable 5V reference supply trimmed to 5%
• Uncommitted output TR for 200mA sink or source current
• Output control for push-pull or single-ended operation
• Variable duty cycle by dead time control (pin 4) Complete PWM control circuit
• On-chip oscillator with master or slave operation
• Internal circuit prohibits double pulse at either output