ZHCS760H February 2012 – June 2018 TLV62130 , TLV62130A
PRODUCTION DATA.
- 1 特性
- 2 应用
- 3 说明
- 4 修订历史记录
- 5 Device Comparison Table
- 6 Pin Configuration and Functions
- 7 Specifications
- 8 Detailed Description
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9 Application and Implementation
- 9.1 Application Information
- 9.2 Typical Application
- 9.3 System Examples
- 10Power Supply Recommendations
- 11Layout
- 12器件和文档支持
- 13机械、封装和可订购信息
8.4.2 Power Save Mode Operation
The TLV62130X enters its built in Power Save Mode seamlessly if the load current decreases. This secures a high efficiency in light load operation. The device remains in Power Save Mode as long as the inductor current is discontinuous.
In Power Save Mode the switching frequency decreases linearly with the load current maintaining high efficiency. The transition into and out of Power Save Mode happens within the entire regulation scheme and is seamless in both directions.
TLV62130 includes a fixed on-time circuitry. This on-time, in steady-state operation, can be estimated (for FSW=Low) as:
For very small output voltages, an absolute minimum on-time of about 80ns is kept to limit switching losses. The operating frequency is thereby reduced from its nominal value, which keeps efficiency high. Also the off-time can reach its minimum value at high duty cycles. The output voltage remains regulated in such cases. Using tON, the typical peak inductor current in Power Save Mode can be approximated by:
When VIN decreases to typically 15% above VOUT, the TLV62130 won't enter Power Save Mode, regardless of the load current. The device maintains output regulation in PWM mode.