AN4123 STMICROELECTRONICS | Alldatasheet

Document overview

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Technical content

Datasheet sections

  • 1 SPV1040 operating description
  • 2 LD39050 operating description
  • 3 Reference design description
  • 4 Schematic and bill of material
  • 5 Layout
  • 5.1 PCB silkscreen
  • 6 Revision history

device. It is shown in Figure 1. Figure 1. STEVAL-ISV015V1 demonstration board connected or, if connected, it needs less power than that available from the source.

  • The PV panel can be selected as long as V OC < 5.5 V and ISC < 1.65 A
  • The inductor L1 can be replaced by considering that it affects the maximum peak current and that an input overcurrent limit (1.65 A) does not have to be triggered
  • The maximum output current can be limited by inserting the current sensing resistor RS1 (0 Ω by default) For further details on component selection, please refer to Section 6 “External component selection” of the AN3319 application note. For details on the SPV1040 device and the LD39050 device features, please refer to the related datasheets.

1 SPV1040 operating description

channel MOSFET synchronous rectifier. Figure 2. Typical application circuit load. In fact, the equivalent circuit can be shown as in Figure 3. Figure 3. SPV1040 equivalent circuit

AN4123 SPV1040 operating description The duty cycle set by the MPPT algorithm can be overwritten if one of the following conditions is triggered:

  • Input overcurrent protection (OVC): inductor peak current ≥ 1.65 A
  • Overtemperature protection (OVT): internal temperature ≥ 155 °C
  • Output voltage regulation: VCTRL triggers the 1.25 V internal reference
  • Output current limitation: RS1 x (ICTRL_PLUS - ICTRL_MINUS) ≥ 50 mV
  • MPP-SET voltage VMPP-SET ≤ 300 mV at the startup and VMPP-SET ≤ 450 mV in running mode. Application components must be carefully selected to avoid any undesired triggering of the above thresholds.

2 LD39050 operating description

limiting and thermal protection. current consumption lower than 1 μA. without risk of damaging the device. Figure 6. LD39050 basic application schematic

3 Reference design description

The setup environment used for the measurement campaign is shown in Figure 7. Figure 7. Supply and load connections ISM490 from ISOTECH (only 100 mA and 900 mA cases are reported). Figure 8. 2 cells in series, 100 mA Figure 9. 3 cells in series, 100 mA Figure 10. 4 cells in series, 100 mA Figure 11. 2 cells in series, 900 mA

4 Schematic and bill of material

Figure 19. Schematic

Table 1. Bill of material

Table 1. Bill of material (continued)

5 Layout

5.1 PCB silkscreen

Figure 22. Bottom view Figure 20. Silkscreen view Figure 21. Top view

Figure 23. High current path guarantee the noise immunity on the voltage drop measurement across RS1. are also needed to improve the overall thermal performance of the device.

6 Revision history

Table 2. Document revision history 17-Jul-2012 1 Initial release. 21-Mar-2013 2 Updated Figure 5: SPV1040 internal block diagram.