LT1070HVCT#PBF

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LT1070HVCT#PBF Applications Fields and Working Principle

The LT1070HVCT#PBF is a type of DC-DC converter designed as a switching regulator which is categorized as PMIC - Voltage Regulators - DC DC Switching Regulators . It is used to regulate voltage and delivers high quality power with low ripple, low noise, and low dissipation. This regulator utilizes a new internal design which features soft start, a low external parts count and an adjustable switching frequency option.

FEATURES

• Wide input voltage range of 4.3V to 20V
• Output voltage adjustable from 0.8V to 18V
• High efficiency up to 90%
• Constant current and constant voltage control
• Very low dropout voltage
• Soft start
• Thermal shutdown

APPLICATIONS

• Audio and video equipment
• Communication systems
• CPU core
• Sensor power
• Load sharing
• Motor control
• POS Systems
• Medical Equipment

WORKING PRINCIPLE

The LT1070HVCT#PBF works on the PWM switching principle. When the regulator is on, a power transistor is connected in series between the input and output. At this time, the current will flow through the inductor to the load. When the transistor is switched off, current will flow through the inductor to the output capacitor and the output voltage will be generated.

The pulse width modulation (PWM) circuit in the regulator is used to control the switching of the power transistor. A sawtooth waveform is generated by the ramp generator, while the other input is the error signal. Together, they enable the PWM to compare the error voltage and the sawtooth waveforms. If the error signal is larger than the sawtooth waveform, the PWM will activate the triac and switch on the power transistor; if not, then the power transistor will be switched off. This switching will happen at a high frequency, about 50KHz in this case.

Moreover, the LT1070HVCT#PBF integrates a foldback current-limiting circuit for short-circuit protection, which can effectively limit the current to reduce the output voltage and ensure the surge current won’t break the power transistor. It also has a thermal shutdown circuit that will automatically turn off the output when the regulator gets too hot and protect it from being damaged.

CONNECTIONS

The LT1070HVCT#PBF is connected using common parts. An input capacitor Cin is connected between the input voltage Vin and ground to filter noisy input voltage. An output capacitor Cout is also connected between the output voltage Vout and ground to filter switching noise and supply the load with constant current.

In order to maximize the efficiency and reduce pulsation, a choke L is connected between input and output. The two capacitors Cout and Cin should be ceramic capacitors with low ESR, such as X7R, Y5U, or X7S. Other components are also needed like Cb, R2, R3, R4, and R5 for the regulation. All the resistors and capacitors should be surface mount.

CONCLUSION

The LT1070HVCT#PBF is an integrated DC-DC converter which is equipped with features such as constant current and constant voltage control and temperature shutdown. It can regulate the output voltage from 4.3V to 20V with an adjustable output voltage range from 0.8V to 18V. Furthermore, it offers high efficiency, low dropout voltage, and low noise and ripple. As a result, the LT1070HVCT#PBF is a great choice for various kinds of applications including audio and video equipment, communication systems, CPU core and motor control.

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