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AN8031 Datasheet(PDF) 10 Page - Panasonic Semiconductor |
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AN8031 Datasheet(HTML) 10 Page - Panasonic Semiconductor |
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10 / 21 page  10 AN8031 Voltage Regulators s Application Notes (continued) [2] Operation descriptions (continued) 1. Normal control (continued) 3) Description of each function (continued) (1) VB (continued) <Setting the VB terminal constant> • Regulation by clamper in/out-current value The allowable output current of the upper limit voltage clamper is −5 mA and the allow- able input current of the lower limit voltage clamper is +5 mA. Either one of these allowable values is ex- ceeded, the voltage clamp operation of the VB terminal is not guaranteed. Therefore, RB should be set so that these values are not exceeded. • Consumption current and delay When the RB value is too large, the VB threshold could be exceeded. When the RB value is too small, the consumption current becomes too large. In order to determine the RB value prop- erly, the input voltage range and the dispersion of components should be taken into consider- ation and it should be confirmed that a stable operation can be ensured under start/overload conditions or under a small load condition. ID SDB VB lower limit voltage clamp current VB upper limit voltage clamp current Clamp upper limit voltage Time Time Lower limit voltage clamp Upper limit voltage clamp VB VB threshold value VB VCC AN8031 GND Figure 5. Explanation of VB operation VB ID IDS IDS Clamp upper limit voltage Reset operation of inductor AN8031 ±5 mA or less VB RB RB too large: Consumption current becomes small, however, TOFF is extended by the delay amount because of low speed. RB too small: Speed is high, however, consumption current is small and undershoot tends to be generated easily. |
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