UNITRODE Manuals

The UC1706 family of output drivers are made with a high-speed Schottky process to interface between low-level control functions and high-power switching devices - particularly power MOSFET's. These devices have dual, 1.5A totem pole outputs with 40ns rise and fall times into 1000pF, support parallel or push-pull operation, and provide single-ended to push-pull conversion. They are high-speed, power MOSFET compatible with low cross-conduction current spike, analog and latched shutdown, internal deadband inhibit circuit, low quiescent current, 5 to 40V operation, thermal shutdown protection, and are available in 16-pin DIP and 20-pin surface mount packages.

This document introduces the characteristics of the UC1705 series products, including 1.5A source/sink drive, 100 ns delay, 40 ns rise and fall to 1000 pF, inverting and non-inverting inputs, low cross-conduction current spike, low quiescent current, 5V to 40V operation, thermal shutdown protection, MINIDIP and power packages.

The UC3704 is an integrated circuit that contains a complete signal conditioning system for interfacing low-level variable impedance transducers to a digital system. A pair of matched, temperature-compensated current sources are provided for balanced transducer excitation followed by a precision, high-gain comparator. The output of this comparator can be delayed by a user-selectable duration, after which a second comparator will switch complementary outputs separately activated for diagnostic operation and has an optional latch with external reset capability. An added feature is a high current power source useful as a heater driver in differential temperature sensing applications. The UC3704 is designed for 0°C to +70°C environments.

This document describes the UC3702 Quad Relay Driver product, including the features of the product, such as maintaining a constant average relay voltage, VBUS voltage up to 42.5V, up to 50mA per relay, integrated Schottky flyback diodes, independent relay control inputs, short circuit protection, user-selectable operating center frequency and relay voltage, and global reset.

The UC1637 is a pulse width modulator circuit intended to be used for a variety of PWM motor drive and amplifier applications requiring either uni-directional or bi- directional drive circuits. When used to replace conventional drivers, this circuit can increase efficiency and reduce component costs for many applications. All necessary circuitry is included to generate an analog error signal and modulate two bi-directional pulse train outputs in proportion to the error signal magnitude and polarity. This monolithic device contains a sawtooth oscillator, error amplifier, and two PWM comparators with ±100mA output stages as standard features. Protection circuitry includes under-voltage lockout, pulse-by-pulse current limiting, and a shutdown port with a 2.5V temperature compensated threshold. The UC1637 is characterized for operation over the full military temperature range of -55°C to +125°C, while the UC2637 and UC3637 are characterized for -25°C to +85°C and 0°C to +70°C, respectively.

The UC1637 is a pulse width modulator circuit intended to be used for a variety of PWM motor drive and amplifier applications requiring either uni-directional or bi-directional drive circuits. When used to replace conventional drivers, this circuit can increase efficiency and reduce component costs for many applications. All necessary circuitry is included to generate an analog error signal and modulate two bi-directional pulse train outputs in proportion to the error signal magnitude and polarity. This monolithic device contains a sawtooth oscillator, error amplifier, and two PWM comparators with ±100mA output stages as standard features. Protection circuitry includes under-voltage lockout, pulse-by-pulse current limiting, and a shutdown port with a 2.5V temperature compensated threshold. The UC1637 is characterized for operation over the full military temperature range of -55°C to +125°C, while the UC2637 and UC3637 are characterized for -25°C to +85°C and 0°C to +70°C, respectively.

The UC1635 UC2635 UC3635 phase locked frequency controller is a precision phase locked frequency control system, which includes a crystal oscillator, programmable reference frequency dividers, a phase detector with absolute frequency steering, separate divider outputs and phase detector input pins, a frequency feedback sensing amplifier with double edge option, two high current op amps and 5V reference output. The series of integrated circuits are designed for use in precision speed control of DC motors. As an extension to the UC1633 line of phase locked controllers, these devices provide access to both of the digital phase detector’s inputs, and include a reference frequency divider output pin. With this added flexibility, this family of controllers can be used to obtain phase synchronization of multiple motors. A reference frequency can be generated using the device’s crystal oscillator and programmable dividers. The oscillator operates using a broad range of crystals, or, can function as a buffer stage to an external fre- quency source. The phase detector responds proportionally to the phase error between the detector’s minus input pin and the sense amplifier output. This phase detector includes absolute frequency steering to provide maxi- mum drive signals when any frequency error exists. This feature allows optimum start-up and lock times to be realized. Two op-amps are included that can be configured to provide necessary loop filtering. The outputs of these op-amps will source power for the phase detector.

The UC1634 series of devices is optimized to provide precision phase locked frequency control for two phase DC brushless motors. These devices include most of the features of the general purpose UC1633 Phase Locked Control family and also provide the out-of-phase commutation signals required for driving two phase brushless motors. Only an external power booster stage is required for a complete drive and control system.

The document introduces the characteristics of the UC1633 series integrated circuits. The series integrated circuits are used in phase-locked frequency control loops and have precise frequency references. They can be generated using the device's high-frequency oscillator and programmable frequency dividers. It can operate using a wide range of crystals, or can function as a buffer stage to an external frequency source.

UC1611, UC3611 is a product of Schmitt Company. It is a matched four-diode monolithic array with high peak current, low-cost MINIDIP package, low forward voltage, parallelable for lower VF or higher IF, fast recovery time, and military temperature range available

This document is about the performance parameters of UC1612, including forward leakage drop, leakage current, reverse recovery time, and parallel capacitance.

The UC3620 is a brushless DC motor driver capable of decoding and driving all 3 windings of a 3-phase brushless DC motor. In addition, an on-board current comparator, oscillator, and high gain Op-Amp provide all necessary circuitry for implementing a high performance, chopped mode servo amplifier. Full protection, including thermal shutdown, pulse-by-pulse current limiting, and under-voltage lockout aid in the simple implementation of reliable designs. Both conducted and radiated EMI have been greatly reduced by limiting the output dv/dt to 150V/µs for any load condition. The UC1620SP is characterized for operation over the full military tem- perature range of -55°C to +125°C, while the UC3620SP is charac- terized for 0°C to +70°C.

The UC1625, UC2625 and UC3625 are three high-performance brushless DC motor controllers that integrate most of the functions required for high-performance brushless DC motor control into one package. When coupled with external power MOSFETs or Darlingtons, these ICs perform fixed-frequency PWM motor control in either voltage or current mode while implementing closed loop speed control and braking, with smart noise rejection, safe direction reversal, and cross-conduction protection. Although specified for operation from power supplies between 10V and 18V, the UC1625 can control higher voltage power devices with external level-shifting components. The UC1625 contains fast, high-current push-pull drivers for low-side power devices and 50V open-collector outputs for high-side power devices or level shifting circuitry. The UC1625 is characterized for operation over the military temperature range of -55°C to +125°C, while the UC2625 is characterized from -40°C to +105°C and the UC3625 is characterized from -40°C to +85°C.

UC1610 UC2610 UC3610 Eight-Diode Schottky Diode Bridge, is designed for high-current, low duty-cycle applications, such as flyback voltage clamping inductive loads. Dual bridge connection makes this device particularly applicable to bipolar driven stepper motors. The use of Schottky diode technology features high efficiency through lowered for- ward voltage drop and decreased reverse recovery time. This single monolithic chip is fabricated in both hermetic CERDIP and copper- leaded plastic packages. The UC1610 in ceramic is designed for -55°C to +125°C environments but with reduced peak current capability. The UC2610 in plastic and ceramic is designed for -25°C to +125°C environments also with reduced peak current capability; while the UC3610 in plastic has higher current rating over a 0°C to +70°C temperature range.

The UC3578 is a PWM controller for single-switch PWM step-down converters that integrates a floating high-side gate driver. It is used to regulate a positive output voltage. Intended for use in a distributed power system, the IC allows operation from 14V to 72V input voltage which range includes the prevalent telecomm bus voltages. The output duty cycle of the UC3578 can vary between 0% and 90% for operation over the wide input voltage and load conditions. The UC3578 simplifies the design of the single switch PWM buck converter by incorporating a floating high side driver for an external N-channel MOSFET switch. It also features a 100kHz fixed frequency oscillator, an internal 2V precision reference, an error amplifier configured for voltage mode operation, and a PWM comparator with latching logic. Complementing the UC3578 are integrated circuits (ICs) that include a comparator for generating PWM pulses from the reference voltage and provide the pulses to the driver for driving the external MOSFET.