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參數(shù)資料
| 型號(hào)： | TPS65510RGTTG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC16 |
| 封裝： | 3 X 3 MM, GREEN, PLASTIC, QFN-16 |
| 文件頁數(shù)： | 2/21頁 |
| 文件大?。?/td> | 929K |
| 代理商： | TPS65510RGTTG4 |
FUNCTIONAL DESCRIPTION
Power-Path Switch
Boost Converter
SLLS917 – SEPTEMBER 2008 .......................................................................................................................................................................................... www.ti.com
The TPS65510 has the switch to select a power path of VOUT pin from main battery or backup battery. These
switches consist of P-ch MOSFET. Also, these switches avoid the reverse current from output side to battery
side.
When the voltage of VO_BT pin (output of boost converter) is higher than the threshold specified by V(SW1) in
Electrical Characteristics, the power path of VOUT comes from main battery via internal boost converter. The
voltage of VOUT pin sets 3.3 V with internal LDO.
When a voltage of VO_BT pin is lower than the threshold specified by V(SW1) in Electrical Characteristics, the
power path of VOUT comes from backup battery at VBK pin. Before the voltage of VO_BT pin reaches V(SW1),
the switch to select a power path cannot change the power path route.
The voltage coming from backup battery is not regulated internally. When the voltage of VOUT is lower than the
threshold specified by V (XRESET_DET) and V (XRESET_HYS) in Electrical Characteristics, the voltage of XRESET pin
goes low (see the description of STATUS INDICATORS).
At the start of boost converter operation, the power path is different to avoid the power supply from backup
battery. In this situation, the power path of VOUT comes from main battery via internal boost converter even if
the output voltage of VO_BT is lower than threshold for CS signal specified by V(sw1) in Electrical Characteristics.
The TPS65510 has the boost converter, and the power path comes from the main battery. It has four operation
modes, WAKE mode, Pulse Frequency Modulation (PFM) mode, Pulse Width Modulation (PWM) mode and
THROUGH mode.
At first, this converter operates as WAKE mode until the voltage of VO_BT pin is less than the threshold
specified by V(WAKE_DET) and V(WAKE_HYS) in Electrical Characteristics. The switching frequency of WAKE mode is
fixed. Only N-ch MOSFET operates during WAKE mode until the voltage of VO_BT pin reaches the threshold
specified by V(WAKE_DET) and V(WAKE_HYS) in Electrical Characteristics.
After the voltage of VO_BT pin reaching more than the threshold specified by V(WAKE_DET) and V(WAKE_HYS) in
Electrical Characteristics, the operation mode is shifted from WAKE mode to other modes selected by the level of
PWMON pin. When the voltage of PWMON pin is low level, the boost converter operates as PFM mode. When
the voltage of PWMON pin is high level, the boost converter operates as PWM mode. When the voltage of main
battery is higher than the voltage of VO_BT pin, the converter operates as THROUGH mode to reduce the
consumption current at VO_BT pin. At this mode, The TPS65510 forces P-ch MOSFET to be ON and N-ch
MOSFET to be OFF. It means that the voltage of VO_BT pin is not regulated.
The boost converter has the reversed current protection to monitor the different voltage between VO_BT pin and
SW pin. The protection monitors the difference at both PFM mode and PWM mode. When the voltage of SW pin
is larger than that of VO_BT pin, the protection is activated. When the protection is activated, the internal P-ch
MOSFET turns OFF. This means that the voltage of SW pin converges the battery voltage naturally.
The output voltage of boost converter depends on the operation mode. When the boost converter operates as
PFM mode, the impedance of FBG pin goes Hi-Z and the output voltage is defined by R1, R2 and R3 shown in
almost zero and the output voltage is defined by R1 and R2 shown in Figure 1 and Figure 2. The output voltage
is calculated by Equation 1 and Equation 2.
10
Copyright 2008, Texas Instruments Incorporated
Product Folder Link(s): TPS65510
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