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参数资料
| 型号： | TPS65072TRSLRQ1 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | POWER SUPPLY SUPPORT CKT, PQCC48 |
| 封装： | 6 X 6 MM, 0.4 MM PITCH, PLASTIC, QFN-48 |
| 文件页数： | 61/90页 |
| 文件大小： | 1375K |
| 代理商： | TPS65072TRSLRQ1 |
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RMSCout
Vout
1
Vin
I
= Vout
L
2
3
-
Vout
1
Vin
Vout = Vout
+ ESR
L
8
Cout
-
D
÷
è
SLVSAP7 – JANUARY 2011
www.ti.com
(6)
At nominal load current the inductive converters operate in PWM mode and the overall output voltage ripple is
the sum of the voltage spike caused by the output capacitor ESR plus the voltage ripple caused by charging and
discharging the output capacitor:
(7)
Where the highest output voltage ripple occurs at the highest input voltage Vin.
At light load currents the converters operate in Power Save Mode and the output voltage ripple is dependent on
the output capacitor value. The output voltage ripple is set by the internal comparator delay and the external
capacitor. The typical output voltage ripple is less than 1% of the nominal output voltage.
Input Capacitor Selection/Input Voltage
Because of the nature of the buck converter having a pulsating input current, a low ESR input capacitor is
required for best input voltage filtering and minimizing the interference with other circuits caused by high input
voltage spikes. The converters need a ceramic input capacitor of 10mF. The input capacitor can be increased
without any limit for better input voltage filtering.
The input voltage for the step-down converters needs to be connected to pin VINDCDC1/2 for DCDC1 and
DCDC2 and to pin VINDCDC3 for DCDC3. These pins need to be tied together to the power source on pin SYS
(output of the power path). The 3 step-down converters must not be supplied from different input voltages.
Table 5. Possible Capacitors
22 mF
0805
TDK C2012X5R0J226MT
Ceramic
22 mF
0805
Taiyo Yuden JMK212BJ226MG
Ceramic
10 mF
0805
Taiyo Yuden JMK212BJ106M
Ceramic
10 mF
0805
TDK C2012X5R0J106M
Ceramic
Output Voltage Selection
The DEFDCDC2 and DEFDCDC3 pins are used to set the output voltage for step-down converter DCDC2 and
DCDC3. See table 1 for the default voltages if the pins are pulled to GND or to Vcc.
Voltage Change on DCDC2 and DCDC3
The output voltage of DCDC2 and DCDC3 can be changed during operation from e.g. 1.0V to 1.2V (TPS65070)
and back by toggling the DEFDCDC2 or DEFDCDC3 pin. The status of the DEFDCDC3 pin is sensed during
operation and the voltage is changed as soon as the logic level on this pin changes from low to high or vice
versa.
The output voltage for DCDC2 and DCDC3 can also be changed by changing the register content in registers
DEFDCDC2_LOW, DEFDCDC2_HIGH, DEFDCDC3_LOW and DEFDCDC3_HIGH.
White-LED BOOST CONVERTER
LED-Current Setting/Dimming
The white LED boost converter generates an output voltage, high enough to drive current through up to 10 white
LEDs connected in series. support one or two strings of white LEDs. If two strings of white LEDs are used, the
number of LEDs in each string is limited to 6LEDs due to the switch current limit as defined in the electrical
characteristics. The boost converter block contains two current sinks to control the current through the white
LEDs. The anodes of the “upper” white-LEDs are directly connected to the output voltage at the output capacitor.
The cathode of the “lowest” LED is connected to the input of the current sink at pin ISINK1 or ISINK2. The
internal current sink controls the output voltage of the boost converter such that there is a minimum voltage at
the current sink to regulate the defined current. The maximum current is set with a resistor connected from pin
64
Copyright 2011, Texas Instruments Incorporated
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