SPV1040 STMicroelectronics, SPV1040 Datasheet - Page 11

• Manufacturer Part Number: SPV1040
• Description: High efficiency solar battery charger with embedded MPPT
• Manufacturer: STMicroelectronics

SPV1040
6.5
6.6
6.7
6.8
6.9
6.10
Constant current regulation
The constant current control loop consists of an op amp and an external sense resistor that
feeds the current sensing circuit with a voltage proportional to the DC output current. This
resistor determines the current regulation set-point and must be adequately rated in terms
of power dissipation. It provides the capability to fix the maximum output current to protect
the battery.
Overcurrent protection (OVC)
When the current that flows through the inductor reaches 1.8 A (overcurrent shutdown limit),
the N-channel power switch is immediately forced OFF and the P-channel synchronous
rectifier is switched ON. Once the overcurrent condition has expired (the inductor current
goes below 1.8 A) the N-channel power switch is turned back ON.
Overtemperature protection (OVT)
When the temperature sensed at silicon level reaches 155 °C (overtemperature shutdown
limit), the N-channel power switch is immediately forced OFF and the P-channel
synchronous rectifier is switched ON. The device becomes operative again as soon as the
silicon temperature goes below 130 °C.
Shutdown mode
The XSHUT pin low shuts OFF all internal circuitry, achieving the lowest power consumption
mode.
Undervoltage lockout (UVLO)
In order to prevent batteries from over-discharging, the device turns OFF in case of MPP-
SET voltage lower than 0.24 V (no irradiation). A hysteresis has been implemented to avoid
unpredictable ON-OFF switching.
Reverse polarity
In order to avoid damage to the device and battery discharge when the solar panel
connection is reverse-inserted, a dedicated protection circuit has been implemented. In
such condition, the SPV1040 stays OFF until the panel is inserted correctly.
Doc ID 18080 Rev 3
Detailed description
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