JAJSBZ4B June   2014  – January 2018

PRODUCTION DATA.

1. 特長
2. アプリケーション
3. 概要
1.     Device Images
4. 改訂履歴
5. Pin Configuration and Functions
6. Specifications
7. Detailed Description
1. 7.1 Overview
2. 7.2 Functional Block Diagram
3. 7.3 Feature Description
4. 7.4 Device Functional Modes
8. Applications and Implementation
1. 8.1 Application Information
2. 8.2 Typical Applications
1. 8.2.1 Design Requirements
2. 8.2.2 Detailed Design Procedure
3. 8.2.3 Application Curves
9. Power Supply Recommendations
10. 10Layout
1. 10.1 Layout Guidelines
2. 10.2 Layout Example
11. 11デバイスおよびドキュメントのサポート
1. 11.1 デバイス・サポート
1. 11.1.1 開発サポート
2. 11.2 ドキュメントの更新通知を受け取る方法
3. 11.3 コミュニティ・リソース
4. 11.4 商標
5. 11.5 静電気放電に関する注意事項
6. 11.6 Glossary
12. 12メカニカル、パッケージ、および注文情報

• PWP|16
• PWP|16

#### 7.3.7 Switching Frequency (RT) and Synchronization (SYNC)

The switching frequency of the LM46001 can be programmed by the resistor RT from the RT pin to ground. The frequency is inversely proportional to the RT resistance. The RT pin can be left floating, and the LM46001 will operate at 500 kHz default switching frequency. The RT pin is not designed to be connected to ground or any other voltage.

For a desired frequency, typical RT resistance can be found by Equation 3.

Equation 3. RT(kΩ) = 40200 / Freq (kHz) – 0.6

Figure 40 shows RT resistance vs switching frequency FS curve.

Table 1 provides typical RT values for a given FS.

### Table 1. Typical Frequency Setting RT Resistance

FS (kHz) RT (kΩ)
200 200
350 115
500 80.6
750 53.6
1000 39.2
1500 26.1
2000 19.6
2200 17.8

The LM46001 switching action can also be synchronized to an external clock from 200 kHz to 2.2 MHz. Connect an external clock to the SYNC pin, with proper high-speed termination, to avoid ringing. Ground the SYNC pin if not used.

The recommendations for the external clock include high level no lower than 2 V, low level no higher than 0.4 V, duty cycle between 10% and 90% and both positive and negative pulse width no shorter than 80 ns. When the external clock fails at logic high or low, the LM46001 switches at the frequency programmed by the RT resistor after a time-out period. TI recommends connecting a resistor RT to the RT pin such that the internal oscillator frequency is the same as the target clock frequency when the LM46001 is synchronized to an external clock. This allows the regulator to continue operating at approximately the same switching frequency if the external clock fails.

The choice of switching frequency is usually a compromise between conversion efficiency and the size of the application circuit. Lower switching frequency implies reduced switching losses (including gate charge losses, switch transition losses, etc.) and usually results in higher overall efficiency. However, higher switching frequency allows use of smaller LC output filters and hence a more compact design. Lower inductance also helps transient response (higher large signal slew rate of inductor current), and reduces the DCR loss. The optimal switching frequency is usually a trade-off in a given application and thus needs to be determined on a case-by-case basis. It is related to the input voltage, output voltage, most frequent load current level(s), external component choices, and circuit size requirement. The choice of switching frequency may also be limited if an operating condition triggers tON-MIN or tOFF-MIN.