MC33067PG

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MC33067PG application field and working principle

The MC33067PG device from ON Semiconductor is a Pulse Width Modulated (PWM) current mode switching controller designed for switching power supplies applications. It is specifically designed for fast current-mode converters and has features specifically designed for high-performance DC/DC conversion. This device is classified as a Pulse Modulated (PMIC) Voltage Regulator and DC/DC Switching Controller.

Applications

The MC33067PG is suitable for any application involving high efficiency switching DC/DC converters. It has been specifically designed for high performance, low switching frequency and low output ripple current applications. Typical applications include notebook computers, LCD TVs, mobile phones, digital cameras, broadband optical access networks, video game consoles, and similar portable and non-portable electronic applications.

Working Principle

The MC33067PG is a current-mode switching controller. It features a low-side MOSFET gate driver and a PWM control with both synchronous and non-synchronous operation. The device is designed to operate in either discontinuous or continuous conduction modes. During normal mode operation, the MC33067PG works in conjunction with an external sense resistor to sense the magnitude of the current flowing through the transformer’s primary side and controlling the width of the primary side gate drive signal accordingly. The MC33067PG also features an over-voltage protection (OVP) circuit that turns the power MOSFET off if the output voltage goes above its preset limit. The OVP is set to a trip point set internally but can be externally adjusted.

Features

• High-performance PWM current-mode switching controller
• Low-side MOSFET gate driver
• Fast current-mode control loop
• Adaptive dead-time control
• Under-voltage protection (UVP) circuit
• Over-voltage protection (OVP) circuit with adjustable trip point setting
• Programmable soft start for current limiting control
• Synchronous and non-synchronous operation modes
• Built-in hysteresis for improved loop stability

Internal Block Diagram

The MC33067PG has a simple, internal block diagram that helps to illustrate the inner workings of the device. At the center of the device is the control logic, which includes the comparators, flip-flops, logic gates and timers necessary to control the switching operation. This control logic is connected to an on-chip gate driver circuit that provides the necessary level-shifting and gate drive signals to the power MOSFETs. The on-chip sense resistor is used to sense the primary switching current and provides this information back to the control logic block. The over-voltage protection (OVP) circuit is also connected to the control logic block and is used to monitor the output voltage. If the OVP trips, the MOSFETs are turned off.

Conclusion

The MC33067PG Pulse Width Modulated (PWM) current mode switching controller made by ON Semiconductor is designed for fast current-mode converters. It is well-suited for DC/DC switches, particularly those requiring high performance, low switching frequency and low output ripple current. Its features include an on-chip gate driver, over-voltage protection (OVP), under-voltage protection (UVP), programmable soft start for current limiting control, synchronous and non-synchronous operation modes, and built-in hysteresis for improved loop stability. The MC33067PG is classified as a Pulse Modulated (PMIC) Voltage Regulator and DC/DC Switching Controller.

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