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ISL97650 Datasheet(PDF) 15 Page - Renesas Technology Corp |
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ISL97650 Datasheet(HTML) 15 Page - Renesas Technology Corp |
15 / 20 page ISL97650 FN9198 Rev.4.00 Page 15 of 20 April 17, 2009 In voltage doubler configuration, the maximum VON is as given by Equations 17, 18 and 19: For Voltage Tripler: VON output voltage is determined by Equation 19: Negative Charge Pump Design Consideration The negative charge pump consists of an internal switcher M1, M2 which drives external steering diodes D2 and D3 via a pump capacitor (C12) to generate the negative VOFF supply. An internal comparator (A1) senses the feedback voltage on FBN and turns on M1 for a period up to half a CLK period to maintain V(FBN) in regulated operation at 0.2V. External feedback resistor R6 is referenced to VREF. Faults on VOFF which cause VFBN to rise to more than 0.4V, are detected by comparator (A2) and cause the fault detection system to start a fault ramp on CDLY pin which will cause the chip to power down if present for more than the time TFD (see "Electrical Specification" section and also Figure “VON FUNCTION DIAGRAM” on page 15). FIGURE 16. VON FUNCTION DIAGRAM VSUP VSUP VSUP C1- POUT FBP CONTROL C1+ C2- C2+ D3 D2 D1 M2 M4 M1 M3 M5 VREF 1.2MHz x2 Mode x3 Mode Both External Connections and Components 0.9V C7 C8 C14 C21 R8 R9 C22 ERROR FB VON_MAX(2x) 2VSUP VDIODE – 2IOUT 2rONH rONL + – = (EQ. 17) VON_MAX(3x) 3VSUP VDIODE – 2IOUT 3rONH 2rONL + – = (EQ. 18) VON VFBP 1 R8 R9 ------- + = (EQ. 19) |
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