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2.5W太阳能USB电源STEVAL-ISV015V1

制  造  商:ST意法半导体

商品编号:STEVAL-ISV015V1

价       格:

¥1064.88(含16%增值税)

数       量:

说       明:

由武汉力源信息技术股份有限公司 发货

Description

The STEVAL-ISV015V1 demonstration board is a solar harvester system designed to supply USB devices and is based on the ST devices SPV1040 (solar voltage boost converter) and LD39050 (voltage regulator with low quiescent current and low noise). The SPV1040 is a high efficiency, low power and low voltage monolithic step-up converter that operates over a 0.3 V to 5 V input voltage range, therefore allowing the use of even a few solar cells in all portable applications where the capability of handling low input voltages is of utmost importance. Despite the variation of several conditions throughout the day (such as irradiation, dirt, temperature, etc.) the SPV1040 allows the achievement of maximum efficiency (90% typ.) in terms of power harvested from the cells and transferred to the output thanks to the embedded MPPT algorithm. The SPV1040 allows the output voltage to be regulated by using an external resistive divider up to 5.2 V, limiting the current supplied to protect the battery and the measuring of input current and voltage to research the maximum power point through a dedicated input pin. Furthermore, the device can be shut off by driving an XSHUT pin to a logic level low, in order to save power when its working mode is not required. Self protection features likeovertemperature and overcurrent at the input are implemented. The LD39050 provides 500 mA maximum current from an input voltage ranging from 1.5 V to 5.5 V with a typical dropout voltage of 200 mV. It is available in a fixed output voltage version from 0.8 V up to 4.5 V (100 mV steps), or adjustable between 0.8 V and Vin- Vdrop. The ultra low drop-voltage, low quiescent current and low noise features make it suitable for low power battery-powered applications. Stability is ensured using ceramic capacitors. The power supply rejection is 65 dB at low frequencies and starts to roll off at 10 kHz. An enable logic control function puts the LD39050 in shut-down mode allowing a total current consumption of lower than 1 μA. The device also includes short-circuit constant current limiting and thermal protection.

Features
■ Proprietary “Perturb and Observe” embedded MPPT algorithm
■ Very low input voltage (down to 0.3 V)
■ Input reverse polarity protection
■ Fully integrated solution with power MOSFET, reverse blocking, diode and output current sense resistor
■ Ultra low dropout and low noise, low quiescent current LDO
■ RoHS compliant

Pictures

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