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參數(shù)資料
| 型號： | LQH32CN100K53 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 20mA LED Driver and OLED Driver with Integrated Schottky in 3mm x 2mm DFN |
| 中文描述： | 20mA的LED驅(qū)動器和3毫米的OLED驅(qū)動器集成肖特基x 2mm DFN封裝 |
| 文件頁數(shù)： | 15/24頁 |
| 文件大?。?/td> | 449K |
| 代理商： | LQH32CN100K53 |
LT3498
15
3498f
V
IN
V
OUT2
R
FB2
3498 F11
LT3498
SW1
CAP1
SW2
CAP2
FB2
CTRL1
LED1
CTRL2
GND2
GND1
C2
V
IN
V
OUT2
R
FB2
LT3498
SW1
CAP1
SW2
CAP2
FB2
CTRL1
LED1
CTRL2
GND2
GND1
C3
C2
a soft transition occurs between the CTRL2 pin and the
internal reference. Figure 10 shows this behavior.
APPLICATIONS INFORMATION—OLED DRIVER
To set the maximum output voltage, select the values of
R
FB2
according to the following equation:
V
FB
2
182
1 215
.
When CTRL2 is used to override the internal reference,
the output voltage can be lowered from the maximum
value down to nearly the input voltage level. If the voltage
source driving the CTRL2 pin is located at a distance to
the LT3498, a small 0.1μF capacitor may be needed to
bypass the pin locally.
R
k
OUT
2
1
=
–
,
Choosing a Feedback Node
The single feedback resistor may be connected to the V
OUT2
pin or to the CAP2 pin (see Figure 11). Regulating the
V
OUT2
pin eliminates the output offset resulting from the
voltage drop across the output disconnect PMOS. Regu-
lating the CAP2 pin does not compensate for the voltage
drop across the output disconnect, resulting in an output
voltage V
OUT2
that is slightly lower than the voltage set by
the resistor divider. Under most conditions, it is advised
that the feedback resistor be tied to the V
OUT2
pin.
Connecting the Load to the CAP2 Node
The efficiency of the converter can be improved by con-
necting the load to the CAP2 pin instead of the V
OUT2
pin.
The power loss in the PMOS disconnect circuit is then
made negligible. By connecting the feedback resistor to
the V
OUT2
pin, no quiescent current will be consumed
in the feedback resistor string during shutdown since
the PMOS transistor will be open (see Figure 12). The
disadvantage of this method is that the CAP2 node can-
not go to ground during shutdown, but will be limited to
around a diode drop below V
IN
. Loads connected to the
part should only sink current.
Never force external power
supplies onto the CAP2 or V
OUT2
pins.
The larger value
output capacitor should be placed on the node to which
the load is connected.
Figure 10. CTRL2 to FB2 Transfer Curve
Figure 11. Feedback Connection Using
the CAP2 Pin or the V
OUT2
Pin
Figure 12. Improved Efficiency
CTRL2 VOLTAGE (V)
0
0
F
0.250
0.500
0.750
1.000
1.500
0.3
0.5
0.8
1.0
3498 F10
1.3
1.5
1.250
V
IN
V
OUT2
R
FB2
I
LOAD
3498 F12
LT3498
SW1
CAP1
SW2
CAP2
FB2
CTRL1
LED1
CTRL2
GND2
GND1
C3
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