UNITRODE Manuals

The UCC1913 family of negative voltage circuit breakers provides complete power management, hot swap, and fault handling capability. The IC is referenced to the negative input voltage and is driven through an external resistor connected to ground, which is essentially a current drive as opposed to the traditional voltage drive. The on-board 10V shunt regulator protects the IC from excess voltage and serves as a reference for programming the maximum allowable output sourcing current during a fault. All control and housekeeping functions are integrated, and externally programmable. These include the fault current level, maximum output sourcing current, maximum fault time, soft start time, and average power limiting. In the event of a constant fault, the internal timer will limit the on-time from less than 0.1% to a maximum of 3%. The duty cycle modulates depending on the current into the PL pin, which is a function of the voltage across the FET, and will limit average power dissipation in the FET. The fault level is fixed at 50mV across the current sense amplifier to minimize total dropout. The fault current level is set with an external current sense resistor. The maximum allowable sourcing current is programmed with a voltage divider from VDD to generate a fixed voltage on the IMAX pin. The current level, when the output appears as a current source, is equal to VIMAX/RSENSE. If desired, a controlled current startup can be programmed.

The UCC3917 family is a positive floating hot swap manager that provides complete power management, hot swap, and fault handling capability. It features precision fault threshold, programmable average power limiting, programmable linear current control, programmable overcurrent limit, etc.

The UCC1919 UCC2919 UCC3919 is a hot swap power manager from Texas Instruments, which features precision fault threshold, low RDSON high side drive, differential sense inputs, programmable average power limiting, programmable linear current control, programmable fault time, fault output indicator, manual and automatic reset modes, shutdown control with programmable softstart, undervoltage lockout and electronic circuit breaker function.

This file introduces the features and characteristics of the UCC3921 series negative floating hot swap power managers, including precision fault threshold, programmable average power limiting, linear current control, overcurrent limit and fault time, fault output indication signal, automatic retry mode or latched operation mode, shutdown control, undervoltage lockout, 250µs glitch filter on the SDFLTCH pin, etc.

The UCC39411 family is a low input voltage, single inductor boost converter optimized to operate from a single or dual alkaline cell and provide a 3.3V, 5V, or adjustable output at 200mW. The family also includes an auxiliary 7V output primarily for the gate drive supply, which can be used for applications requiring an auxiliary output such as 5V, through linear regulation. The primary output can start up under full load at input voltages typically as low as 0.8V with a guaranteed maximum of 1V and can operate down to 0.5V once the converter is operating, maximizing battery utilization. The UCC39411 family is designed for demanding applications such as pagers and cell phones that require high efficiency over a wide operating range of several milliwatts to a couple of hundred milliwatts. High efficiency at low output current is achieved by optimizing switching and conduction losses with a low total quiescent current (50µA). At higher output currents, the 0.5Ω switch and 1.2Ω synchronous rectifier, along with continuous mode conduction, provide high power efficiency. The wide input voltage range of the UCC39411 family can accommodate other power sources such as NiCd and NiMH. The 39411 family also offers shutdown control. Available packages include the 8-pin SOIC (D), 8-pin DIP (N or J), and 8-pin TSSOP (PW) to optimize board space.

The UCC3808 is a low power, high performance, dual output current mode pulse width modulator. The device contains all of the control and drive circuitry required for off-line or DC-to-DC fixed frequency current-mode switching power supplies with minimal external parts count.

This document is the introduction manual of UCC3809 series products, mainly introduces the characteristics and features of this series of products.

The UCC3809 family is a BCDMOS economy low power integrated circuit that contains all the control and drive circuitry required for off-line and isolated DC-to-DC fixed frequency current mode switching power supplies with minimal external parts count. It features user programmable soft start, maximum duty cycle, and other characteristics.

UCC1810, UCC2810, and UCC3810 are high-speed BiCMOS integrated circuits for use in off-line and DC-to-DC power supplies. They provide two synchronized pulse width modulators using the same oscillator for perfect synchronization. These products incorporate many of the same elements as the UC3842 current mode controller family, combined with the enhancements of the UCC3802, minimizing power supply parts count.

The UCC3837 is a linear regulator controller from ON Semiconductor that is used in low voltage (3V) applications. The device contains all the necessary features to use an external N-channel MOSFET as the switch, and it can achieve an extremely low dropout voltage.

The document describes the features and characteristics of UCC3839, including practical secondary side control, use of external N-channel depletion mode FET, onboard precision fixed gain differential current sense amplifier, wide bandwidth current error amplifier, 5V reference, and high current programmable Gm amplifier. The UCC3839 is designed for secondary side average current mode control in isolated power supplies.

Low Power, Dual Output, Current Mode PWM Controller

The UCC3583 is a synchronizable secondary side post regulator for preci- sion regulation of the auxiliary outputs of multiple output power supplies.

The UCC3776 is a four output BCDMOS buffer/driver designed to drive highly capacitive loads such as power MOSFET gates at high speeds. The device can be configured as either an inverting or non-inverting driver via the POL pin. The outputs are enabled by ENBL. When disabled, all outputs are active low. The device incorporates thermal shutdown with hysteresis for stability. The device also includes an undervoltage lockout circuit (UVLO) with hystere- sis which disables the outputs when VDD is below a preset threshold. The outputs are held low during undervoltage lockout, even in the absence of VDD power to the device.This helps prevent MOSFET turn-on due to capaci- tive current through the gate-drain capacitance of the power MOSFET in the presence of high dV/dts. The logic input thresholds are compatible with standard 5V HCMOS logic.

The UCC1800/1/2/3/4/5, UCC2800/1/2/3/4/5, and UCC3800/1/2/3/4/5 are a family of high-speed, low-power integrated circuits designed for off-line and DC-to-DC fixed frequency current-mode switching power supplies. They feature internal soft start, internal fault soft start, and internal leading-edge blanking of the current-sense signal.