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HA16113 Datasheet(PDF) 10 Page - Hitachi Semiconductor |
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HA16113 Datasheet(HTML) 10 Page - Hitachi Semiconductor |
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10 / 18 page  HA16113FPJ 10 External Circuit Constant Calculations (cont) Item Equation Remarks V NMI V = 1.2 1 + × (R1 // 71.7) (R2 // 25) NMI NMI recovery voltage (V high) is: NMI V high = 86.65 R1 NMI + 86.65 R2 // 25 + 1.2 1 + 73.8 R1 Ω (R1 and R2 are in k ) Voltage at which the NMI signal is output when Vout drops. The NMI trigger voltage and NMI recovery voltage can be trimmed by connecting resistors between the NMIadj pin and Vout (R1), and between NMIadj and GND (R2). Vout R1 NMIadj R2 NMI Vout NMI VNMI V high NMI t V STBY (R3 is in k ) V = 71 31.2 + (36.8 // R3) STBY 1 + Ω 1.47 × Voltage at which the STBY signal is output when Vout drops. The STBY trigger voltage can be adjusted by connecting a resistor (R3) between the STBYadj pin and GND. The STBY recovery voltage cannot be adjusted. Vout STBYadj R3 STBY Vout STBY VSTBY V high STBY t WDT. Line1 = 0.31 (Du – 24) Cf Rf × × Line2 = Du (= 25%)* Line3 = 0.015 Cf Rf × Line4 = 1 – Du 2.1 tRH × Line5 = 99% Du is the duty cycle of the P-RUN pulse. * Du = t t + t RH RL RH Note: Line2 and Line5 are fixed. The watchdog timer function determines whether the P- RUN pulse is normal or not. A reset pulse is output if P- RUN is determined to be abnormal. The normal region is the part bounded by Line1 to Line3 (or Line4) in the diagram. Line4 applies in certain cases, depending on C R, Cf, and the state of P-RUN. Line1 Line4 Line5 Line2 Line3 Normal area Frequency (Hz) Duty (%) |
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