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ZHCSCV3A July 2013 – September 2014 TPS65631W

PRODUCTION DATA.

封装选项

机械数据 (封装 | 引脚)

DSK|10
- MPDS326A

散热焊盘机械数据 (封装 | 引脚)

DSK|10
- QFND148E

订购信息

9 Applications and Implementation

NOTE

Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality.

9.1 Application Information

Figure 9 shows a typical application circuit suitable for supplying AMOLED displays in smartphone applications. The circuit is designed to operate from a single-cell Li-Ion battery and generates a positive output voltage V_POS of 4.6 V and a negative output voltage of –4 V. Both outputs are capable of supplying up to 300 mA of output current.

9.2 Typical Application

Figure 9. Typical Application Schematic

9.2.1 Design Requirements

For this design example, use the following input parameters.

Table 2. Design Parameters

DESIGN PARAMETER	EXAMPLE
Input voltage range	2.9 V to 4.5 V
Output voltage	V_POS = 4.6V, V_NEG = –4 V

9.2.2 Detailed Design Procedure

In order to maximize performance, the TPS65631W has been optimized for use with a relatively narrow range of component values, and customers are strongly recommended to use the application circuit shown in Figure 9 with the components listed in Table 3 and Table 4.

9.2.2.1 Inductor Selection

The boost converter and inverting buck-boost converter have been optimized for use with 10 µH inductors, and it is recommended that this value be used in all applications. Customers using other values of inductor are strongly recommended to characterize circuit performance on a case-by-case basis.

Table 3. Inductor Selection⁽¹⁾

PARAMETER	VALUE	MANUFACTURER	PART NUMBER
L1, L2	10 µH	Toko	DFE252012C-100M
		ABCO	LPP252012-100M
		Taiyo Yuden	MDKK2020T-100M

(1) See Third-Party Products Disclaimer

9.2.2.2 Capacitor Selection

The recommended capacitor values are shown in Table 4. Applications using less than the recommended capacitance (e.g. to save PCB area) may experience increased voltage ripple. In general, the lower the output power, the lower the necessary capacitance.

Table 4. Capacitor Selection⁽¹⁾

PARAMETER	VALUE	MANUFACTURER	PART NUMBER
C1	2 × 10 µF	Murata	GRM21BR71A106KE51
C2	10 µF	Murata	GRM21BR71A106KE51
C3	2 × 10 µF	Murata	GRM21BR71A106KE51
C4	100 nF	Murata	GRM21BR71E104KA01

(1) See Third-Party Products Disclaimer

9.2.2.3 Stability

Applications using component values that differ significantly from those recommended in Table 3 and Table 4 should be checked for stability over the full range of operating conditions.

9.2.3 Application Curves

The performance shown in the following graphs was obtained using the circuit shown in Figure 9 and the external components shown in Table 3 and Table 4. The output voltage settings for these measurements were V_POS = 4.6 V and V_NEG = –4 V.