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ZHCSF63A September 2013 – June 2016 TPS65154

PRODUCTION DATA.

封裝選項

機械數據 (封裝 | 引腳)

RSL|48
- MPQF193B

散熱焊盤機械數據 (封裝 | 引腳)

RSL|48
- QFND155O

訂購信息

6 Application and Implementation

NOTE

Information in the following Applications section 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.

6.1 Application Information

The TPS65154 devices is intended primarily for use in notebook PC and tablet applications. It needs these two supply voltages

A regulated 3.3-V or 5-V supply for the LCD bias functions
A direct connection to the battery for the WLED driver functions

The device configuration parameters are set by I²C interface and stored in the on-chip nonvolatile memory.

6.2 Typical Application

Figure 6-1 shows the recommended application circuit for typical applications. The I²C interface is used to optimize the circuit's operating parameters for a specific application. If different component values are used, make sure that the values are within the recommended operating conditions (see Recommended Operating Conditions). If different component values are used, the compensation components may also need to be optimized for stability and best performance.

Figure 6-1 Typical Application Circuit

6.2.1 Design Requirements

This design example uses the parameters listed in Table 6-1 as the input parameters.

Table 6-1 Input Parameters

PARAMETER	SYMBOL	VALUE
Input supply voltage – LCD bias functions	V_IN	3.3 V
Input supply voltage – WLED driver	V_BAT	9 V to 21 V
Boost converter 1 output voltage	AV_DD	8 V
Inverting charge pump output voltage	V_GL	–6.8 V
Boost converter 2 output voltage	V_GH	20 V
Linear regulator output voltage	V_CC	2.5 V
WLED driver output current (per string)	I_SET	50 mA

6.2.2 Detailed Design Procedure

6.2.2.1 External Component Selection

Care should be applied to the choice of external components since they greatly affect overall performance. The TPS65154 was developed with the twin goals of high performance and small/low-profile solution size. Since these two goals are often in direct opposition to one another (for example, larger inductors tend to achieve higher efficiencies), some trade-off is always necessary.

Inductors must have adequate current capability so that they do not saturate under worst-case conditions. For high efficiency, they should also have low dc resistance (DCR).

Capacitors must have adequate effective capacitance under the applicable dc bias conditions they experience in the application. MLCC capacitors typically exhibit only a fraction of their nominal capacitance under real-world conditions and this must be taken into consideration when selecting them. This problem is especially acute in low profile capacitors, in which the dielectric field strength is higher than in taller components. In general, the capacitance values shown in circuit diagrams in this data sheet refer to the effective capacitance after dc bias effects have been taken into consideration. Reputable capacitor manufacturers provide capacitance versus dc bias curves that greatly simplify component selection.

The following tables list some components suitable for use with the TPS65154. The list is not exhaustive – other components may exist that are equally suitable (or better), however, these components have been proven to work well and were used extensively during the development of the TPS65154.

Table 6-2 Linear Regulator External Component Recommendations

REF.	DESCRIPTION	PART NUMBER	MANUFACTURER	MAX. THICKNESS
C_OUT	10 µF, 6.3 V, ±20%, X5R, 0603	GRM188R60J106ME84	Murata	0.95 mm

Table 6-3 Boost Converter 1 External Components

REF.	DESCRIPTION	PART NUMBER	MANUFACTURER	MAX. THICKNESS
L	10 µH, 1.5 A, 0.205 Ω	NRS6012T100MMGG	Taiyo Yuden	1.2 mm
C_OUT	10 µF, 16 V, ±10%, X5R, 1206	GRM319R61C106KE15D	Murata	0.85 ±0.1 mm

Table 6-4 Boost Converter 2 External Components

REF.	DESCRIPTION	PART NUMBER	MANUFACTURER	MAX. THICKNESS
L	10 µH, 0.6 A	NRH3010T100MN	Taiyo Yuden	1 mm
C_OUT	4.7 µF, 50 V, ±10%, X5R, 1206	GRM319R61H475KA12	Murata	0.95 mm

Table 6-5 Boost Converter 3 External Components

REF.	DESCRIPTION	PART NUMBER	MANUFACTURER	MAX. THICKNESS
L	10 µH, 1.5 A, 0.205 Ω	NRS6012T100MMGGJ	Taiyo Yuden	1.2 mm
C_OUT	4.7 µF, 50 V, ±10%, X5R, 1206	GRM319R61H475KA12	Murata	0.95 mm

6.2.3 Application Curves

Figure 6-2 Boost Converter 1 (AV_DD) Efficiency

Figure 6-4 Boost Converter 1 (AV_DD) Load Regulation

Figure 6-6 Boost Converter 1 (AV_DD) Load Transient Response

Figure 6-8 Boost Converter 1 (AV_DD) Switching Waveforms

Figure 6-10 Boost Converter 2 (V_GH) Line Regulation

Figure 6-12 Boost Converter 2 (V_GH) Load Transient Response

Figure 6-14 Boost Converter 2 (V_GH) Switching Waveforms

Figure 6-16 Linear Regulator (V_CC) Line Regulation

Figure 6-18 Linear Regulator (V_CC) Line Transient Response

Figure 6-20 Negative Charge Pump (V_GL) Load Regulation

Figure 6-22 Negative Charge Pump (V_GL) Output Voltage Ripple

Figure 6-24 VCOM Buffer Large-Signal Response

Figure 6-26 VCOM Buffer Peak Output Current

Figure 6-28 LCD Bias Power-Up Sequencing

Figure 6-30 LCD Bias Power-Up Sequencing

Figure 6-32 LCD Bias Power-Down Sequencing

Figure 6-34 LCD Bias Power-Down Sequencing

Figure 6-36 Boost Converter 3 (V_LED) Efficiency

Figure 6-38 Boost Converter 3 (V_LED) Line Regulation

Figure 6-40 Boost Converter 3 (V_LED) Line Transient Response

Figure 6-42 Boost Converter 3 (V_LED) Output Voltage Ripple

Figure 6-44 PWM Direct Dimming Waveforms

Figure 6-46 WLED Driver Power-Up Sequence

Figure 6-48 WLED Driver Power-Up Sequence

Figure 6-50 WLED Driver Power-Up Sequence

Figure 6-52 Thermal Shutdown

Figure 6-3 Boost Converter 1 (AV_DD) Line Regulation

Figure 6-5 Boost Converter 1 (AV_DD) Line Transient Response

Figure 6-7 Boost Converter 1 (AV_DD) Output Voltage Ripple

Figure 6-9 Boost Converter 2 (V_GH) Efficiency

Figure 6-11 Boost Converter 2 (V_GH) Load Regulation

Figure 6-13 Boost Converter 2 (V_GH) Output Voltage Ripple

Figure 6-15 Boost Converter 2 (V_GH) Switching Frequency

Figure 6-17 Linear Regulator (V_CC) Load Regulation

Figure 6-19 Linear Regulator (V_CC) Load Transient Response

Figure 6-21 Negative Charge Pump (V_GL) Load Transient Response

Figure 6-23 Gate Voltage Shaping (V_GHM) Switching Waveforms

Figure 6-25 VCOM Buffer Small-Signal Bandwidth

Figure 6-27 LCD Bias Power-Up Sequencing

Figure 6-29 LCD Bias Power-Up Sequencing

Figure 6-31 LCD Bias Power-Down Sequencing

Figure 6-33 LCD Bias Power-Down Sequencing

Figure 6-35 Boost Converter 3 (V_LED) Efficiency

Figure 6-37 Boost Converter 3 (V_LED) Efficiency

Figure 6-39 Boost Converter 3 (V_LED) Load Regulation

Figure 6-41 Boost Converter 3 (V_LED) Load Transient Response

Figure 6-43 Boost Converter 3 (V_LED) Switching Waveforms

Figure 6-45 PWM Phase-Shifted Dimming

Figure 6-47 WLED Driver Power-Up Sequence

Figure 6-49 WLED Driver Power-Up Sequence

Figure 6-51 WLED Driver Power-Up Sequence