ZHCSD04E November 2014 – March 2022 TPS65400
PRODUCTION DATA
- 1 特性
- 2 應用
- 3 說明
- 4 Revision History
- 5 說明（續）
- 6 Pin Configuration and Functions
- 7 Specifications
-
8 Detailed Description
- 8.1 Overview
- 8.2 Functional Block Diagrams
- 8.3
Feature Description
- 8.3.1 Startup Timing and Power Sequencing
- 8.3.2 UVLO and Precision Enables
- 8.3.3 Soft-Start and Prebiased Startup
- 8.3.4 PWM Switching Frequency Selection
- 8.3.5 Clock Synchronization
- 8.3.6 Phase Interleaving
- 8.3.7 Fault Handling
- 8.3.8 OCP for SW1 to SW4
- 8.3.9 Overcurrent Protection for SW1 to SW4 in Current Sharing Operation
- 8.3.10 Recovery on Power Loss
- 8.3.11 Feedback Compensation
- 8.3.12 Adjusting Output Voltage
- 8.3.13 Digital Interface – PMBus
- 8.3.14 Initial Configuration
- 8.4 Device Functional Modes
- 8.5 Programming
- 8.6
Register Maps
- 8.6.1
PMBus Core Commands
- 8.6.1.1 (00h) PAGE
- 8.6.1.2 (01h) OPERATION
- 8.6.1.3 (03h) CLEAR_FAULTS
- 8.6.1.4 (10h) WRITE_PROTECT
- 8.6.1.5 (11h) STORE_DEFAULT_ALL
- 8.6.1.6 (19h) CAPABILITY
- 8.6.1.7 (78h) STATUS_BYTE
- 8.6.1.8 (79h) STATUS_WORD
- 8.6.1.9 (7Ah) STATUS_VOUT
- 8.6.1.10 (80h) STATUS_MFR_SPECIFIC
- 8.6.1.11 (98h) PMBUS_REVISION
- 8.6.1.12 (ADh) IC_DEVICE_ID
- 8.6.1.13 (AEh) IC_DEVICE_REV
- 8.6.2
Manufacturer-Specific Commands
- 8.6.2.1 (D0h) USER_DATA_BYTE_00
- 8.6.2.2 (D1h) USER_DATA_BYTE_01
- 8.6.2.3 (D2h) PIN_CONFIG_00
- 8.6.2.4 (D3h) PIN_CONFIG_01
- 8.6.2.5 (D4h) SEQUENCE_CONFIG
- 8.6.2.6 (D5h) SEQUENCE_ORDER
- 8.6.2.7 (D6h) IOUT_MODE
- 8.6.2.8 (D7h) FREQUENCY_PHASE
- 8.6.2.9 (D8h) VREF_COMMAND
- 8.6.2.10 (D9h) IOUT_MAX
- 8.6.2.11 (DAh) USER_RAM_00
- 8.6.2.12 (DBh) SOFT_RESET
- 8.6.2.13 (DCh) RESET_DELAY
- 8.6.2.14 (DDh) TON_TOFF_DELAY
- 8.6.2.15 (DEh) TON_TRANSITION_RATE
- 8.6.2.16 (DFh) VREF_TRANSITION_RATE
- 8.6.2.17 (F0h) SLOPE_COMPENSATION
- 8.6.2.18 (F1h) ISENSE_GAIN
- 8.6.2.19 (FCh) DEVICE_CODE
- 8.6.1
PMBus Core Commands
- 9 Application and Implementation
- 10Power Supply Recommendations
- 11Layout
- 12Device and Documentation Support
- 13Mechanical, Packaging, and Orderable Information
8.6.2.15 (DEh) TON_TRANSITION_RATE
The TON_TRANSITION_RATE command sets the soft-start ramp rate for the selected output. This command is ignored by default because soft-start is set externally through the SSx/ PG pin. Only when the SSx/ PG pin is configured as PG through PIN_CONFIG_01 will TON_TRANSITION_RATE determine the soft-start rate.
The soft-start ramp rate refers to the rate at which the reference voltage is increased. The time to complete the soft-start can be calculated from the target reference voltage as Equation 6.
For example, if VREF is set to 0.6 V and the default soft-start ramp rate of 0.5 V/ms is selected, then the soft-start time would be 1.2 ms. If VREF is set to 1 V and the soft-start ramp rate of 0.25 V/ms is selected, then the soft-start time would be 4 ms.
| BITS | NAME | READ / WRITE | DEFAULT VALUE | BINARY VALUE | VALUE | MEANING |
|---|---|---|---|---|---|---|
| 7:2 | — | R | 000000 | — | — | — |
| 1:0 | TON_RAMP_RATE | R/W | 10 | 00 | 2 V/ms | Soft-start ramping rate |
| 01 | 1 V/ms | |||||
| 10 | 0.5 V/ms | |||||
| 11 | 0.25 V/ms |
PAGE support is for outputs 0x00 through 0x03.