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TLE7276G 데이터시트(PDF) 9 Page - Infineon Technologies AG |
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TLE7276G 데이터시트(HTML) 9 Page - Infineon Technologies AG |
9 / 20 page TLE 7276 Data Sheet 9 Rev. 1.11, 2010-11-22 Additionally a buffer capacitor CB of > 10μF should be used for the output to suppress influences from load surges to the voltage levels. This one can either be an aluminum electrolytic capacitor or a tantalum capacitor following the application requirements. A general recommendation is to keep the drop over the equivalent serial resistor (ESR) together with the discharge of the blocking capacitor below the allowed Headroom of the Application to be supplied (e.g. typ. dVQ = 350mV). Since the regulator output current roughly rises linearly with time the discharge of the capacitor can be calculated as follows: dVCB = dIQ*dt/CB The drop across the ESR calculates as: dVESR = dI*ESR To prevent a reset the following relationship must be fullfilled: dVC + dVESR < VRH = 350mV Example: Assuming a load current change of dIQ = 100mA, a blocking capacitor of CB = 22µF and a typical regulator reaction time under normal operating conditions of dt ~ 25µs and for special dynamic load conditions, such as load step from very low base load, a reaction time of dt ~ 75µs. dVC = dIQ*dt/CB = 100mA * 25µs/22µF = 113mV So for the ESR we can allow dVESR = VRH2 - dVC = 350mV - 113mV = 236mV The permissible ESR becomes: ESR = dVESR / dIQ = 236mV/100mA = 2.36Ohm During design-in of the TLE7469 product family, special care needs to be taken with regards to the regulators reaction time to sudden load current changes starting from very low pre-load as well as cyclic load changes. The application note “TLE7x Voltage Regulators - Application Note about Transient Response at ultra low quiescent current Voltage Regulators” (see 3_cip05405.pdf) gives important hints for successful design-in of the Voltage Regulators of the TLE7x family. |
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