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参数资料
| 型号： | TPS60230RGTT |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 0.2 A SWITCHED CAPACITOR REGULATOR, 1250 kHz SWITCHING FREQ-MAX, PQCC16 |
| 封装： | 3 X 3 MM, GREEN, PLASTIC, QFN-16 |
| 文件页数： | 4/20页 |
| 文件大小： | 640K |
| 代理商： | TPS60230RGTT |
www.ti.com
APPLICATION INFORMATION
TYPICAL APPLICATION OF A SMART PHONE DISPLAY WITH RESISTORS CONNECTED IN
VIN
C1+
C1
C2+
C2
EN1
EN2
GND
VOUT
D1
D2
D3
D4
D5
ISET
0.47 mF
1 mF
VIN = 2.7 V
to 6.5 V
Typical Smartphone Display
PGND
ANALOG DIMMING USING ISET PIN
VIN
C1+
C1
C2+
C2
EN1
EN2
GND
VOUT
D1
D2
D3
D4
D5
ISET
0.47 mF
1 mF
VIN = 2.7 V
to 6.5 V
6 kW
V = 0 mV to
600 mV
PGND
TYPICAL APPLICATION USING 2 WHITE LEDs AND 6 GREEN LEDs FOR LCD BACKLIGHT AND
TPS60230
SLVS516A – MAY 2004 – REVISED JUNE 2004
PARALLEL
If more than 25 mA of output current is needed, then the input pins to the current sinks can be connected in
parallel as shown in the following application figure. This method can also be used to connect a LC display with
only two connections for the white LEDs.
Figure 12. Typical Application With Resistors in Parallel
The ISET pin can be used to connect an analog dc signal in the range of 0 mV to 600 mV (EN1 = EN2 = 1) for
analog dimming of the white LEDs. For an input voltage of 0 V at ISET, the current is at its maximum, whereas at
600 mV, the LED current is zero. The maximum current is:
For EN2 = EN1 = 1: ILED = Vset/Rset × K = 0.6V/6kR × 270 = 27 mA per LED
For EN2 = 1, EN0 = 1: ILED = Vset/Rset × K = 0.4V/6kR × 270 = 18 mA per LED
For EN2 = 0, EN1 = 1: ILED = Vset/Rset × K = 0.2V/6kR × 270 = 9 mA per LED
With EN2, EN1 set to 10 or 01, a voltage of 400 mV or 200 mV is required to set the LED current to zero.
Figure 13. Analog Dimming Connections Using ISET Pin
12
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