DIODES PAM2421 EV Motherboard User Guide

DIODES PAM2421 EV Motherboard

Specifications

• Efficiency: Greater than 90%
• Adjustable Output Voltage: Up to 24V
• Internal 24V Power MOSFET
• Frequency: 520kHz
• Built-in Over Voltage Protection (OVP)
• Open Protection
• Programmable Soft Start Function
• Thermal Shutdown
• Under Voltage Lockout
• Over Current Protection
• Package: SOP-8 (EP)

Product Usage Instructions

1. EV Board Operational Sequence:

• a. Connect EN to high (H side).
• b. Connect load to output terminal.
• c. Connect Vin and GND to power supply. Vin=5V or Li-ion battery.

FAQ

• Q: Can the output voltage be adjusted on the PAM2421 EVBoard?
  • A: Yes, the qPAM2421 EV Board allows for adjustable output voltage up to 24V.
• Q: What is the frequency of the PAM2421 EV Board?
  • A: The PAM2421 EV Board operates at a frequency of 520kHz.
• Q: Does the PAM2421 EV Board have built-in protection features?
  • A: Yes, the board includes built-in Over Voltage Protection (OVP), Open Protection, Thermal Shutdown, Under Voltage Lockout, and Over Current Protection.

Revision Information

PAM2804 General Description

The PAM2421 devices are high-performance, fixed frequency, current-mode PWM step-up DC/DC converter that incorporate internal power MOSFET. The PAM2421 includes an integrated power MOSFET that supports peak currents of up to 3A. The PAM2421 utilizes simple external loop compensation allowing optimization between component size, cost, and AC performance across a wide range of applications. Additional functions include an externally programmable soft- start function for easy inrush current control, internal over-voltage protection (OVP), cycle-by-cycle current limit protection, under voltage lock- out and thermal shutdown. The PAM2421 is available in the small SOP-8(EP) package.

Key Features

• Greater than 90% Efficiency
• Adjustable Output Voltage Up to 24V
• Internal 24V Power MOSFET
• 520kHz Frequency
• Built-in Over Voltage Protection (OVP)
• Open Protection
• Programmable Soft Start Function
• Thermal Shutdown
• Under Voltage Lockout
• Over Current Protection
• SOP-8 (EP) Package

EV Board Schematic

EVB PAM2421 TB15AA Description

PAM2421 TB15AA is an evaluation board for the PAM2421, a DC/DC boost converter. The board is targeted to be used in providing a simple and convenient evaluation environment for the PAM2421. Requires parts, power supply connectors etc. on the board, which makes it easy to be evaluated.

EV Board View

EV Board Operational Sequence:

• a. Connect EN to high (H side).
• b. Connect load to output terminal.
• c. Connect Vin and GND to power supply. Vin=5V or Li-ion battery.

External Components Selection

Input & output Capacitors (C1, C2, C3, C9, C10, C11)

1. For lower output ripple, low ESR is required (C2, C3, C9, C10), Low leakage current is needed, X5R/X7R ceramic is recommended.
2. Provide large power, large capacitance electrolytic capacitor recommend parallel connection to the ceramic capacitor (C1, C11).

Vin filter (R1, C4)

1. RC filter to filter the switching noise on IC supply, 10Ω and 1uF ceramic capacitor recommended.

Compensation net (R2, C5, C6)

1. R2 56kΩ, C5 2.2nF, C6 47pF recommended.

Soft start (C7)

1. C7 0.1uF recommended.

Schottky Diode (D1, D2)

1. SS34 3A/40V Schottky diode recommended.
2. B340 3A/40V Schottky diode recommended.

Feedforward capacitor (C8)

1. Lower the output ripple, low leakage current needed, using according to application.

Output Voltage programmer resistors (R3, R4, R5)

1. For programmer output voltage
2. For accurate output voltage, 1% tolerance is required. Vo=1.262*(1+R3/R4//R5).

Inductor (L1)

1. Low DCR for good efficiency
2. The inductance saturate current must higher than the output current

Evaluation Board BOM List

PCB Layout Example

This application note contains new product information. Diodes, Inc. reserves the right to modify the product specification without notice. No liability isassumed as a result of the use of this product. No rights under any patent accompany the sale of the product

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