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| 型號(hào)： | TPS650732TRSLRQ1 |
| 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, GREEN, PLASTIC, QFN-48 |
| 文件頁(yè)數(shù)： | 64/90頁(yè) |
| 文件大小： | 1375K |
| 代理商： | TPS650732TRSLRQ1 |
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www.ti.com
SLVSAP7 – JANUARY 2011
Other inductors, with lower or higher inductance values can be used. A higher inductance will cause a lower
inductor current ripple and therefore will provide higher efficiency. The boost converter will also stay in
continuous conduction mode over a wider load current range. The energy stored in an inductor is given by
E=1/2L × I2 where I is the peak inductor current. The maximum current in the inductor is limited by the internal
current limit of the device, so the maximum power is given by the minimum peak current limit (see electrical
specifications) times the inductance value. For highest output power, a large inductance value is needed. The
minimum inductor value possible is limited by the energy needed to supply the load. The limit for the minimum
inductor value is given during the on-time of the switch such that the current limit is not reached.
Example for the minimum inductor value:
Vin = 4.2 V, Vout = 19.7 V, Iout = 5 mA, Vsw =0.1 V
→ D = 79%
→ ton = 703 ns
During the on-time, the inductor current should not reach the current limit of 1.4 A.
With V… voltage across the inductor (V = Vin–Vsw)
→ L = V × dt/di = (4.2 V–0.1 V) × 703ns/1.4A = 2mH
Diode Selection
Due to the non-synchronous design of the boost converter, an external diode is needed. For best performance, a
Schottky diode with a voltage rating of 40V or above should be used. A diode such as the MBR0540 with an
average current rating of 0.5A is sufficient.
Output Capacitor Selection
A ceramic capacitor such as X5R or X7R type is required at the output. See Table 7 for reference.
Table 7. Tested Capacitor
TYPICAL VOLTAGE
LED
CAPACITOR
ACROSS OUTPUT
CAPACITOR TYPE
MANUFACTURER
CONFIGURATION
VALUE
SIZE
CAPACITOR
2x6LEDs or 1x6LEDs
21 V
4.7 mF / 50 V
1206
UMK316BJ475KL
Taiyo Yuden
1x10LEDs
35 V
4.7 mF / 50 V
1210
GRM32ER71H475KA
Murata
Input Capacitor Selection
A small ceramic input capacitor of 10 mF is needed at the input of the boost converter. If the inductor is directly
connected to the SYS output of , the capacitor can be shared. In this case the capacitance needs to be 22mF or
above. Only X5R or X7R ceramic capacitors should be used.
BATTERY CHARGER
Temperature Sensing
The battery charger integrated in has an over temperature protection for the Li-ion cell. The temperature is
sensed with a NTC located at the battery. Comparators in suspend charge at a temperature below 0°C and
above 45°C. The charger supports two different resistor values for the NTC. The default is internally programmed
to 10k. It is possible to change to a 100k NTC with the I2C interface.
Table 8. NTCs Supported
RESISTANCE AT 25°C
CURVE / B VALUE
RT2 NEEDED FOR
MANUFACTURER
LINEARIZATION
10k
Curve 2 / B=3477
75k
Several
100k
Curve 1 / B=3964
370k
Several
Copyright 2011, Texas Instruments Incorporated
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