Description : Simple Solution for Dynamically Programming the Output Voltage of DC-DC Converters
Figure 1 shows a typical dc-to-dc converter configuration. As in many PWM controllers, the non-inverting input of the voltage feedback error amplifier is internally connected to the reference voltage, Vr. The output voltage of the converter is set by a resistor divider network R1 and R2. This configuration enables a fixed output voltage that is equal to or greater than the reference voltage. But in many power conversion designs, it is useful to vary the output to a value lower than the reference voltage and to dynamically adjust the output voltage.
■ GENERAL DESCRIPTION NJM2405 is a dual comparator, including the high precision reference voltage circuit. Both channels have hystersis pins, so it could provide the hysteretic function for systems. It has the wide range of operating voltage and works with less current consumption, so that it is suitable for detecting abnormal conditions, to change over to back up memories when the voltage drops off in operation.
■ FEATURES • Operating Voltage (2.5V to 20V) • Low Operating Current • Internal Low Reference Voltage • Adjustable Hystersis Voltage • Package Outline DMP8 • Bipolar Technology
Description : LOW CONSUMPTION VOLTAGE AND CURRENT CONTROLLER FOR BATTERY CHARGERS AND ADAPTORS
TSM1012 is a highly integrated solution for SMPS applications requiring CV (constant voltage) and
CC (constant current) mode. TSM1012 integrates one voltage reference and two operational amplifiers (with ORed outputs - common collectors). The voltage reference combined with one operational amplifier makes it an ideal voltage controller. The other operational, combined with few external resistors and the voltage reference, can be used as a current limiter.
■ CONSTANT VOLTAGE AND CONSTANT CURRENT CONTROL
■ LOW CONSUMPTION
■ LOW VOLTAGE OPERATION
■ LOW EXTERNAL COMPONENT COUNT
■ CURRENT SINK OUTPUT STAGE
■ EASY COMPENSATION
■ HIGH AC MAINS VOLTAGE REJECTION
■ FIXED OUTPUT VOLTAGE REFERENCE 1.25V
■ 0.5% AND 1% VOLTAGE PRECISION
DESCRIPTION The TL7700A series are monolithic supply voltage supervisor IC’s specifically designed for use as reset controllers in microcomputer and microprocessor systems.
■ POWER-ON RESET GENERATOR ■ AUTOMATIC RESET GENERATION AFTER VOLTAGE DROP ■ WIDE SUPPLY VOLTAGE RANGE ... 3V TO 18V ■ PRECISION VOLTAGE SENSOR ■ TEMPERATURE-COMPENSATED VOLTAGE REFERENCE ■ TRUE AND COMPLEMENT RESET OUTPUTS ■ EXTERNALLY ADJUSTABLE PULSE WIDTH
Description : Class-H high-output voltage level line driver
The TDA8574(T) is a two channel class-H high-output voltage line driver for use in car audio applications. The line driver behaves as a non-inverting amplifier with a gain of 8 dB and a single-ended output. Due to the class-H voltage lifting principle the voltage swing over the load is more than the supply voltage. With a supply voltage of 9 V the output voltage swing over the load will be 14 V (peak-to-peak).
• Output voltage swing larger than supply voltage
• High supply voltage ripple rejection
• Low distortion
• Low noise
• ESD protected on all pins.
NJM2103 is supply voltage supervisory IC to detect the abnormal conditions, such as shut down of all supply voltage at once, or sudden voltage down and then generate the reset signal. It supervises both 5V supply voltage and the voltage optionally set up.