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| 型號： | TPS65072TRSLRQ1 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | POWER SUPPLY SUPPORT CKT, PQCC48 |
| 封裝： | 6 X 6 MM, 0.4 MM PITCH, PLASTIC, QFN-48 |
| 文件頁數(shù)： | 29/90頁 |
| 文件大?。?/td> | 1375K |
| 代理商： | TPS65072TRSLRQ1 |
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SLVSAP7 – JANUARY 2011
SHORT-CIRCUIT PROTECTION
All outputs are short circuit protected with a maximum output current as defined in the electrical specifications.
THERMAL SHUTDOWN
As soon as the junction temperature, TJ, exceeds typically 150°C for the DCDC converters or LDOs, the device
goes into thermal shutdown. In this mode, the high side MOSFETs are turned-off. The device continues its
operation when the junction temperature falls below the thermal shutdown hysteresis again. A thermal shutdown
for one of the DCDC converters or LDOs will disable all step-down converters simultaneously.
Low Dropout Voltage Regulators
The low dropout voltage regulators are designed to operate well with low value ceramic input and output
capacitors. They operate with input voltages down to 1.8V. The LDOs offer a maximum dropout voltage of
200mV at rated output current. Each LDO supports a current limit feature. LDO2 is enabled internally using Bit
ENABLE_LDO2 in register CON_CTRL1. The output voltage for LDO2 is defined by the settings in register
DEFLDO2. LDO2 can also be configured in such a way that it follows the output voltage of converter DCDC3 by
setting Bit LDO2 TRACKING = 1 in register DEFLDO2.
LDO1 is enabled internally using Bit ENABLE_LDO1 in register CON_CTRL1. The output voltage for LDO1 is
defined by the settings in register DEFLDO1. LDO1 can also be enabled automatically depending on the settings
in register LDO_CTRL1.
White LED Boost Converter
The converter is in shutdown mode by default and is being turned on by setting the enable Bit with the I2C
interface or for TPS65072 with pin EN_wLED. The enable Bit is located in register WLED_CTRL1 and is called
ENABLE ISINK as it enables the current sink for the white LEDs. Once enabled, an output voltage is
automatically generated at FB_wLED, high enough to force the programmed current through the string of white
LEDs. Two strings of white LEDs can be powered. The current in each of the two strings is regulated by an
internal current sink at pins Isink1 and Isink2. The maximum current through the current sinks is set with two
external resistors connected from pins ISET1 and ISET2 to GND. ISET1 sets the maximum current when Bit
CURRENT LEVEL in register WLED_CTRL2 is set to 1. If this Bit is set to 0, which is the default setting, the
maximum current is defined by the resistor connected at ISET2. This allows change between two different
maximum current settings during operation. The LED current can further be dimmed with an internal PWM signal.
The duty cycle for this PWM signal can be changed with the Bits LED DUTY CYCLE 0 to LED DUTY CYCLE 6 in
register WLED_CTRL2 in a range from 1% to 100%. In case a dimming ratio higher than 1:100 is needed, the
maximum LED current need to be changed to a lower value as defined with Iset2. In order to do this without any
flicker, the PWM dimming and the current level is defined in the same register, so both settings can be changed
at the same time with a single write access to register WLED_CTRL2. An internal overvoltage protection limits
the maximum voltage at FB_wLED to 37V typically. The output voltage at FB_WLED also has a lower limit which
is set to 12V. In case less than 4LEDs are used, the output voltage at the boost converter will not drop below
12V but the voltage from ISINK1 and ISINK2 to GND is increased accordingly.
A/D Converter
The 10Bit successive approximation (SAR) A/D converter with an input multiplexer can be used to monitor
different voltages in the system. These signals are monitored:
Battery voltage
Voltage at AC input
Voltage at SYS output
Input voltage of battery charger
Battery temperature
Battery charge current (voltage at pin Iset; Icharge = UISET/Rset × KISET)
External voltage 1 to external voltage 4 (AD_IN1 to AD_IN4); 0V to 2.25V
Optionally: External voltage 5 to external voltage 7 (AD_IN5 to AD_IN7); 0V to 6.0V
Internal channel AD_IN14 and AD_IN15 for touch screen measurements
The A/D converter uses an internal 2.26V reference. The reference needs a bypass capacitor for stability which
Copyright 2011, Texas Instruments Incorporated
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