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ADP5135ACPZ-R7 数据表(PDF) 13 Page - Analog Devices |
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ADP5135ACPZ-R7 数据表(HTML) 13 Page - Analog Devices |
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13 / 24 page  Data Sheet ADP5135 Rev. 0 | Page 13 of 24 THEORY OF OPERATION Figure 35. Detailed Functional Block Diagram POWER MANAGEMENT UNIT The ADP5135 is a micropower management unit (micro PMU) combining three step-down (buck) dc-to-dc converters. The high switching frequency and tiny 24-lead LFCSP package provide a small power management solution. A system controller combines these high performance regulators in the micro PMU, allowing them to operate together. The buck regulators can operate in forced PWM mode if the MODE pin is at a logic high level. In forced PWM mode, the buck switching frequency is always constant and does not change with the load current. If the MODE pin is at a logic low level, the switching regulators operate in auto PWM/PSM mode. In this mode, the regulators operate at a fixed PWM frequency when the load current is above the PSM current threshold. When the load current falls below the PSM current threshold, the regulator enters PSM, where the switching occurs in bursts. The burst repetition rate is a function of the current load and the output capacitor value. This operating mode reduces the switching and quiescent current losses. The auto PWM/PSM mode transition is controlled independently for each buck regulator. BUCK1 and BUCK2 operate in phase with the internal clock, and BUCK3 operates out of phase from it. The ADP5135 has individual enable pins (EN1, EN2, and EN3) controlling the activation of each regulator. The regulators are activated by a logic high level applied to the respective ENx pin. EN1 controls BUCK1, EN2 controls BUCK2, and EN3 controls BUCK3. PWM/ PSM CONTROL BUCK3 SOFT START PWM/ PSM CONTROL BUCK2 DRIVER AND ANTISHOOT THROUGH SOFT START DRIVER AND ANTISHOOT THROUGH OSCILLATOR THERMAL SHUTDOWN SYSTEM UNDERVOLTAGE LOCKOUT PWM COMP GM ERROR AMP GM ERROR AMP PSM COMP PSM COMP LOW CURRENT ILIMIT DRIVER AND ANTISHOOT THROUGH PWM COMP LOW CURRENT ILIMIT PWM COMP LOW CURRENT ILIMIT ADP5135 VOUT1 VOUT2 VIN1 AVIN SW1 PGND1 PGND2 SW2 VIN2 75Ω ENBK1 EN1 ENBK1 POWER GOOD CONTROL ENBK2 ENBK3 75Ω ENBK2 EN2 EN3 B SEL OP MODE MODE2 A Y MODE VOUT3 FB3 PGND3 SW3 VIN3 FB1 FB2 PWM/ PSM CONTROL BUCK1 SHUTDOWN AND PRECISION ENABLE CONTROL PG1 FB1 PG2 FB2 PG3 FB3 SOFT START GM ERROR AMP PSM COMP 75Ω ENBK3 NOTES 1. ENBKx ENABLES BUCKx. |
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