AZ7500CP-E1

Product Overview

• Category: Integrated Circuit (IC)
• Use: Voltage Mode PWM Controller
• Characteristics:
  • High-performance PWM controller
  • Designed for offline and DC-to-DC converter applications
  • Provides precise control of power supply output voltage and current
• Package: DIP-16 (Dual In-line Package with 16 pins)
• Essence: The AZ7500CP-E1 is a voltage mode PWM controller that offers efficient and reliable control over power supply output.
• Packaging/Quantity: The AZ7500CP-E1 is typically sold in reels or tubes, with a quantity of 1000 units per reel/tube.

Specifications

• Input Voltage Range: 8V to 35V
• Output Voltage Range: 5V to 30V
• Operating Temperature Range: -40°C to +85°C
• Switching Frequency: Adjustable up to 500kHz
• Maximum Duty Cycle: 50%
• Output Current: Up to 500mA

Detailed Pin Configuration

The AZ7500CP-E1 has a total of 16 pins. Here is the detailed pin configuration:

1. VCC: Power supply input
2. GND: Ground reference
3. COMP: Error amplifier output
4. FB: Feedback input for regulating output voltage
5. CS: Current sense input
6. RT/CT: Timing resistor/capacitor connection
7. OSC: Oscillator timing capacitor connection
8. SYNC: Synchronization input
9. SS/TR: Soft-start/tracking time setting
10. INV: Inverting input of error amplifier
11. NC: No connection
12. DRV: Gate driver output
13. OUT: Output of the PWM controller
14. NC: No connection
15. NC: No connection
16. NC: No connection

Functional Features

• Voltage Mode Control: The AZ7500CP-E1 utilizes voltage mode control to regulate the output voltage of power supplies accurately.
• Adjustable Switching Frequency: The switching frequency can be adjusted up to 500kHz, allowing flexibility in design and optimization for different applications.
• Soft-Start Function: The soft-start feature enables a gradual increase in output voltage during startup, reducing stress on components and preventing overshoot.
• Synchronization Capability: The SYNC pin allows synchronization with an external clock signal, enabling multiple PWM controllers to operate in phase.
• Protection Mechanisms: The IC incorporates various protection features such as overvoltage protection (OVP), undervoltage lockout (UVLO), and thermal shutdown.

Advantages and Disadvantages

Advantages: - Precise control over output voltage and current - High-performance PWM controller - Adjustable switching frequency - Soft-start function for smooth startup - Synchronization capability for multi-controller operation - Built-in protection mechanisms

Disadvantages: - Limited maximum duty cycle (50%) - Output current limited to 500mA

Working Principles

The AZ7500CP-E1 operates based on the voltage mode control technique. It compares the feedback voltage from the output with a reference voltage and generates a pulse-width modulated (PWM) signal to regulate the power supply output. By adjusting the duty cycle of the PWM signal, the controller controls the average output voltage.

During operation, the error amplifier continuously monitors the output voltage and adjusts the duty cycle accordingly. The soft-start function gradually increases the duty cycle during startup to prevent sudden voltage surges. The synchronization input allows multiple controllers to work together, ensuring synchronized operation in systems requiring multiple power supplies.

Detailed Application Field Plans

The AZ7500CP-E1 is widely used in various applications, including:

1. Offline Power Supplies: The IC is commonly employed in offline power supplies for consumer electronics, such as televisions, audio systems, and computer peripherals.
2. DC-to-DC Converters: It finds extensive use in DC-to-DC converter circuits, enabling efficient voltage conversion in devices like battery chargers, LED drivers, and industrial control systems.
3. Switching Power Supplies: The AZ7500CP-E1 is suitable for designing switching power supplies used in telecommunications equipment, networking devices, and automotive electronics.

Detailed and Complete Alternative Models

Here are some alternative models that offer similar functionality to the AZ7500CP-E1:

1. SG3525: A popular PWM controller with adjustable frequency and duty cycle, widely used in power supply designs.
2. UC3842: Another voltage mode PWM controller known for its high-performance characteristics and versatile applications.
3. TL494: A flexible PWM controller offering adjustable frequency, duty cycle, and dead time control, suitable for various power supply designs.

These alternative models provide designers with options based on specific requirements and design constraints.

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