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TDA16831-4 bảng dữ liệu(PDF) 7 Page - Infineon Technologies AG |
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TDA16831-4 bảng dữ liệu(HTML) 7 Page - Infineon Technologies AG |
7 / 21 page TDA 16831-4 Data Sheet 7 1999-12-10 switched off the output capacitor is discharged via pulse signal pwmpls. The oscillator signal slogpwm sets the RS-flip- flop. The gate drive circuit is switched on, when capacitor voltage exceeds the internal threshold of 0.4 V. This leads to a linear ramp, which is created by the output of the amplifier. Therefore duty cycle of 0 % is possible. The amplifier is compensated through an internal compen- sation network. The transfer function of the amplifier can be described as the step response is described with Comparator (pwmcomp) The comparator pwmcomp compares the amplified current signal pwmrmp of the CoolMOS with the reference signal pwmin. Pwmin is created by an external optocoupler or external transistor and gives the information of the feedback circuitry. When the pwmrmp exceeds the reference signal pwmin the comparator switches the CoolMOS off. Logic (logpwm) The logic logpwm comprises a RS-flip-flop and a NAND-gate. The NAND-gate insures that CoolMOS transistor is only switched on when sosta is on and pwmin has exceeded minimum threshold and pwmin is below pwmrmp and currentshutdown is off and tempshutdown is off and tff sets the starting impulse. CoolMOS transistor is switched off when pwmrmp exceeds pwmin or duty cycle exceeds 0.5 or pwmcs exceeds I max or silicium temperature exceeds T max or uvlo is going below threshold. The RS flip flop ensures that with every frequency period only one switch on can occur (double pulse suppression). Gate Drive (gtdrv) Gtdrv is the driver circuit for the CoolMOS and is optimized to minimize EMI influences and to provide high circuit efficiency. This is done by smoothing the switch on slope when reaching the CoolMOS threshold. Leading switch on spike is minimized then. When CoolMOS is witched off, the falling slope of the gate driver is slowed down when reaching 2 V. So an overshoot below ground can't occur. Also gate drive circuit is designed to eliminate cross conduction of the output stage. Current Shut Down (cssd) Current shut down circuit switches the CoolMOS immediately off when the sense current is exceeding an internal threshold of 100 mV at R sense. V o V i ----- K i p 1 Tp × + () × ------------------------------------ p ;j ω == V o V i K i × = t on T – Te -t on T ---------- × + è ç÷ æö × K i 40 t on ------ = T 850 ns = |
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