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參數資料
| 型號： | TPS60230RGTTG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | 0.2 A SWITCHED CAPACITOR REGULATOR, 1250 kHz SWITCHING FREQ-MAX, PQCC16 |
| 封裝： | 3 X 3 MM, GREEN, PLASTIC, QFN-16 |
| 文件頁數： | 5/20頁 |
| 文件大小： | 640K |
| 代理商： | TPS60230RGTTG4 |
www.ti.com
VOUT = VD1 + VFLEDD1
Rg +
V
FLEDD1 *
V
Fg
Ig
VIN
C1+
C1
C2+
C2
EN1
EN2
GND
VOUT
D1
D2
D3
D4
D5
ISET
0.47 mF
1 mF
VIN = 2.9 V
to 6.5 V
6 Green
LEDs With
5 mA Each
2 White
LEDs With
30 mA Each
5.4 kW
Sets Current to 30 mA
Per Current Sink
(With EN2 = EN1 = 1)
PGND
PROPOSED LAND PATTERN FOR PCB PRODUCTION
PHOTO FLASH APPLICATIONS
TPS60230
SLVS516A – MAY 2004 – REVISED JUNE 2004
APPLICATION INFORMATION (continued)
KEYBOARD LIGHTING
The TPS60230 can be used to power any kind of LED. It is also possible to mix white LEDs with color LEDs
which have a lower forward voltage. The LED with the highest forward voltage (typically the white LED) has to be
connected to D1, because the output voltage of the charge pump is regulated in such a way to keep the voltage
drop from D1 to GND at 400mV (with EN1 = EN2 = 1). Therefore the output voltage of the charge pump is
regulated to:
VOUT— Output voltage at VOUT
VD1— Voltage from D1 to GND (Vsource at D1 pin, see electrical characteristics)
VFLEDD1— Forward voltage of the LED connected to D1
Resistor Rg is used to provide current sharing between the 6 green LEDs. The upper value is calculated using:
VFg— Forward voltage of a green LED
Ig— Current per green LED
Figure 14. LED Connections for LCD Backlight and Keyboard Lighting
Refer to the application note SLUA271 for the proposed land pattern of the QFN package.
The TPS60230 can be used to power one or more white LEDs for photo flash applications. These applications
usually require a certain current for a short period of time. The photo flash is typically turned on for 100 ms to
500 ms and turned off for a longer period of time. For such applications, when the TPS60230 is not turned on
continuously, the device can support an output current of 150 mA. See Figure 5 for the input voltage needed for
a certain LED forward voltage and LED current.
13
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相關代理商/技術參數 |
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| TPS60231 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:WHITE LED CHARGE PUMP CURRENT SOURCE WITH PWM BRIGHTNESS CONTROL |
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