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ADP1046AACPZ-R7 数据表(PDF) 70 Page - Analog Devices |
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ADP1046AACPZ-R7 数据表(HTML) 70 Page - Analog Devices |
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70 / 88 page ![]() ADP1046A Data Sheet Rev. 0 | Page 70 of 88 Table 82. Register 0x52—SR1 Rising Edge Setting (SR1 Pin) Bits Bit Name R/W Description [7:4] t 9 R/W These bits contain the four LSBs of the 12-bit t 9 time. This value is always used with the eight bits of Register 0x51, which contains the eight MSBs of the t 9 time. Each LSB corresponds to 5 ns resolution. The entire switching period is divided into 40 ns time steps. If the t Rx and tFx of a PWM edge occur within the same 40 ns time step, the PWM output is 0 V. If the t Rx and tFx occur in different 40 ns time steps, the PWM output is set to the programmed value. The absolute maximum pulse width is t PERIOD − 5 ns. It is recommended that the SR1 rising edge not be set between 80 ns and 115 ns when using the SR soft start. 3 Modulate enable R/W 1 = PWM modulation acts on the t 9 edge. 0 = no PWM modulation of the t 9 edge. 2 t 9 sign R/W 1 = negative sign. Increase of PWM modulation moves t 9 right. 0 = positive sign. Increase of PWM modulation moves t 9 left. 1 Reserved R/W Reserved. 0 SR soft start edge control R/W 0 = always allow SR edge crossing. 1 = allow SR edge crossing only during SR soft start (recommended). Table 83. Register 0x53—SR1 Falling Edge Timing (SR1 Pin) Bits Bit Name R/W Description [7:0] t 10 R/W This register contains the eight MSBs of the 12-bit t 10 time. This value is always used with the top four bits of Register 0x54, which contains the four LSBs of the t 10 time. Each LSB corresponds to 5 ns resolution. The entire switching period is divided into 40 ns time steps. If the t Rx and tFx of a PWM edge occur within the same 40 ns time step, the PWM output is 0 V. If the t Rx and tFx occur in different 40 ns time steps, the PWM output is set to the programmed value. The absolute maximum pulse width is t PERIOD − 5 ns. Table 84. Register 0x54—SR1 Falling Edge Setting (SR1 Pin) Bits Bit Name R/W Description [7:4] t 10 R/W These bits contain the four LSBs of the 12-bit t 10 time. This value is always used with the eight bits of Register 0x53, which contains the eight MSBs of the t 10 time. Each LSB corresponds to 5 ns resolution. The entire switching period is divided into 40 ns time steps. If the t Rx and tFx of a PWM edge occur within the same 40 ns time step, the PWM output is 0 V. If the t Rx and tFx occur in different 40 ns time steps, the PWM output is set to the programmed value. The absolute maximum pulse width is t PERIOD − 5 ns. 3 Modulate enable R/W 1 = PWM modulation acts on the t 10 edge. 0 = no PWM modulation of the t 10 edge. 2 t 10 sign R/W 1 = negative sign. Increase of PWM modulation moves t 10 right. 0 = positive sign. Increase of PWM modulation moves t 10 left. 1 SR soft start setting R/W 1 = SR signals perform a soft start every time that they are enabled. 0 = SR signals perform a soft start only the first time that they are enabled. 0 SR soft start enable R/W Setting this bit enables the soft start function for the SR signals. Table 85. Register 0x55—SR2 Rising Edge Timing (SR2 Pin) Bits Bit Name R/W Description [7:0] t 11 R/W This register contains the eight MSBs of the 12-bit t 11 time. This value is always used with the top four bits of Register 0x56, which contains the four LSBs of the t 11 time. Each LSB corresponds to 5 ns resolution. The entire switching period is divided into 40 ns time steps. If the t Rx and tFx of a PWM edge occur within the same 40 ns time step, the PWM output is 0 V. If the t Rx and tFx occur in different 40 ns time steps, the PWM output is set to the programmed value. The absolute maximum pulse width is t PERIOD − 5 ns. It is recommended that the SR2 rising edge not be set between 80 ns and 115 ns when using the SR soft start. |
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