BA6897FP-E2 Datasheet Summary

Overview

The BA6897FP-E2 is a 4-channel BTL driver IC designed for CD player motors and actuators. It features an internal 5V regulator and a standard operational amplifier, making it suitable for a wide range of applications in optical disc drives.

Applications

• CD players
• CD-ROM drives

Features

1. Minimal number of external components.
2. Adjustable driver gain with a single attached resistor.
3. Internal 5V regulator (requires an attached PNP transistor).
4. Internal standard operational amplifier.
5. Internal thermal shutdown circuit.

Absolute Maximum Ratings (Ta = 25°C)

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Recommended Operating Conditions (Ta = 25°C)

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Block Diagram

The block diagram illustrates the internal components of the BA6897FP-E2, including the level shift, operational amplifier, driver buffer, regulator, and thermal shutdown circuit.

Pin Descriptions

The BA6897FP-E2 has a specific pin configuration with detailed descriptions for each pin, including input and output functions relative to the polarity of the input pins.

Electrical Characteristics

The electrical characteristics of the BA6897FP-E2 are provided for standard conditions (Ta = 25°C, VCC = 8V, f = 1kHz, RL = 8Ω). These characteristics include parameters such as input voltage range, output voltage, and current capabilities.

Circuit Operation

The IC processes input signals from the servo preamplifier and motor control signals. It performs V/I conversion and generates BTL output via the driver buffer. The regulator generates a reference voltage internally, and the operational amplifier is a general-purpose type (4558).

Application Examples

Example circuits for the BA6897FP-E2 are provided, showing typical connections for CD player applications, including connections to the servo preamplifier, motor, and regulator.

Operation Notes

1. The IC has an internal thermal shutdown circuit that mutes output current when the chip temperature exceeds 175°C.
2. The mute pin should be pulled up above 2.0V during normal operation to avoid muting.
3. The bias pin should stay above 1.6V during normal operation.
4. During muting, only the drivers are muted, and the output pins remain at the internal bias voltage.
5. A 0.1μF bypass capacitor should be connected to the power supply.
6. The radiating fin is connected to the package's internal GND and should also be connected to an external GND.
7. The capacitor between the regulator output and GND helps prevent oscillation.

Electrical Characteristic Curves

Graphs are provided for various electrical characteristics, including driver I/O characteristics, thermal derating curves, and regulator voltage vs. output voltage.

External Dimensions

The external dimensions of the BA6897FP-E2 are specified in millimeters, with detailed measurements for the package.

This summary provides a comprehensive overview of the BA6897FP-E2, covering its key features, ratings, and applications.