in this video SDC7500 / KA7500 Voltage Mode SMPS Controller - Explained SDC7500/ KA7500 is equivalent / substitute / replacement of TL494 NCV494.

TL494 detailed video [ Ссылка ]
The KA7500B is used for the control circuit of the PWM switching regulator. The KA7500B consists of 5V reference voltage circuit, two error amplifiers, a 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 1kHz to 300kHz 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

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