UNITRODE Manuals

This document mainly introduces the features and characteristics of the UC3548 product, including primary power supply voltage feed-forward control, accurate DC control, accurate programmable maximum duty cycle clamp, maximum volt-second product clamp, practical operation frequency up to 1MHz, high current (2A peak) Totem Pole output driver, wide bandwidth (8MHz) current error amplifier, undervoltage lockout monitor VCC, VIN and VREF, low startup current (500µA) and other

UC1524A UC2524A UC3524A is a kind of integrated circuit (IC) with a precise 5V voltage reference and error amplifier, which can be applied to the output lines of the power supply.

This document introduces the features and characteristics of UC1524, UC2524 and UC3524. They can be used to construct regulating power supplies, inverters or switching regulators. They can also be used as the control element for high-power-output applications.

This is a chip for driving motors. It can provide 350mA continuous drive capability, contains all the logic required for full stepping and half stepping, supports fast stepping rates, can be used as a voltage doubler, and can be used as a phase generator or driver. It supports power-on reset.

The UC3178 full-bridge power amplifier is designed for demanding servo applications. It features precision current control, programmable over-current control, range control, and compensation adjust. The device operates in both 5V and 12V systems and has low saturation voltage and current protection.

The UC3176/7 family of full bridge power amplifiers is rated for a continuous output current of 2A. Intended for use in demanding servo applications such as disk head positioning, the onboard current sense amplifier can be used to obtain precision control of load current, or where voltage mode drive is required, a standard voltage feedback scheme can be used. Output stage protection includes foldback current limiting and thermal shutdown, resulting in a very rugged device. Auxiliary functions on this device include a dual input under-voltage comparator that can be programmed to respond to low voltage conditions on two independent supplies. In response to an under-voltage condition the power Op-Amps are inhibited and a high current, 100mA, open collector drive output is activated. The devices are operational over a 3V to 35V supply range. Internal under-voltage lockout provides predictable power-up and power-down characteristics.

The UC3176/7 family of full bridge power amplifiers is rated for a continuous output current of 2A. Intended for use in demanding servo applications such as disk head positioning, the onboard current sense amplifier can be used to obtain precision control of load current, or where voltage mode drive is required, a standard voltage feedback scheme can be used. Output stage protection includes foldback current limiting and thermal shutdown, resulting in a very rugged device.

This document introduces the TL494AN/C/D/E functions and features, including precision current control, ±800mA load current, 1.25V total VSAT at 800mA, controlled velocity head parking, precision dual supply monitor with indicator, limit input to force output extremes, inhibit input and UVLO, 4V to 15V operation.

This document describes a full-bridge power amplifier with features such as precision current control, ±800mA load current, 1.25V total VSAT at 800mA, controlled velocity head parking, etc. It is intended for demanding servo applications such as head positioning for high-density disk drives.

The UC3173A full bridge power amplifier, rated for continuous output current of 0.55A, is intended for use in demanding servo applications such as head positioning for high density disk drives. This device includes a precision current sense amplifier that senses load current with a single resistor in series with the load. The UC3173A is optimized to consume a minimum of supply current, and is designed 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 1.5mA of total supply current. Auxiliary functions on this device include a dual input undervoltage comparator, 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 impedance to be inserted to control maximum head velocity.

The UC3173A full bridge power amplifier, rated for continuous output current of 0.55A, is intended for use in demanding servo applications such as head positioning for high density disk drives. This device includes a precision current sense amplifier that senses load current with a single resistor in series with the load. The UC3173A is optimized to consume a minimum of supply current, and is designed 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 1.5mA of total supply current. Auxiliary functions on this device include a dual input undervoltage comparator, which can monitor two independent supply voltages and activate the built in head park function when either is below minimum. The park circuit 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 impedance to be inserted to control maximum head velocity.

The UC382 is a fast-response low dropout linear regulator that provides a quick response to fast load changes. Combined with its precision on-board reference, the UC382 excels at driving GTL and BTL buses. Due to its fast response to load transients, the total capacitance required to decouple the regulator’s output can be significantly decreased when compared to standard LDO linear regulators. Dropout voltage (VIN to VOUT) is only 450mV maximum at 100°C and 350mV typical at 3A load. The on-board bandgap reference is stable with temperature and scaled for a 1.200V input to the internal power amplifier. The UC382 is available in fixed output voltages of 1.5V, 2.1V, or 2.5V. The output voltage of the adjustable version can be set with two external resistors. If the external resistors are omitted, the output voltage defaults to 1.2V.