UC3172A

更新时间： 2025-07-16 12:47:15

品牌	Logo	应用领域
德州仪器 - TI		放大器功率放大器
页数	文件大小	规格书
12页	486K
描述
Full Bridge Power Amplifier

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UC3172A 数据手册

UC3172A

Full Bridge Power Amplifier

FEATURES

DESCRIPTION

•

Plug-in Compatibility with the

UC3173A

The UC3172A power amplifier is pin-for-pin compatible with the UC3173A. Im-

provements have been made to allow more liberal application of the device.

This full bridge power amplifier, rated for continuous output current of 1A, is in-

tended for use in demanding servo applications such as head positioning for

high-density disk drives. This device includes a precision current sense ampli-

fier that senses load current with a single resistor in series with the load. The

UC3172A is optimized to consume a minimum of supply current, and is de-

signed to operate in both 5V and 12V systems. The power output stages have

a low saturation voltage and are protected with current limiting and thermal

shutdown. When inhibited the device will draw less than 1.8mA of total supply

current.

•

5V or 12V Operation

13mA Quiescent Supply Current

1.8mA Standby Current

Precision Current Control

1A Load Current

1.65V Typical Total VSAT at 1A

Controlled Velocity Head Parking

Auxiliary functions on this device include a dual-input undervoltage compara-

tor, which can monitor two independent supply voltages and activate the built-

in head park function when either is below minimum. The park circuitry allows

a programmable retract voltage to be applied to the load for limiting maximum

head velocity. A separate low-side parking drive pin permits a series imped-

ance to be inserted to control maximum retract current. The parking drive func-

tion can be configured to operate with supply voltages as low as 1.2V.

Range Control for 4:1 Gain

Change

•

Compensation Adjust Pin for

Bandwidth Control

•

Inhibit Input and UVLO

The closed loop transconductance of the configured power amplifier can be

switched between a high and low range with a logic input. The 4:1 change in

gain can be used to extend the dynamic range of the servo loop. Bandwidth

variations that would otherwise result with the gain change can be controlled

with a compensation adjust pin.

PLCC, SOIC, and Low Profile

Quad Flat Pack Packages

BLOCK DIAGRAM

UDG-94039

Note: Pin numbers refer to QP package.

9/96

12 3 4 5 6 7...12

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UC3172ADW	TI	获取价格	VOICE COIL MOTOR CONTROLLER, 1A, PDSO28, SOIC-28
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