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参数资料
| 型号： | AS1344-BTDT |
| 厂商： | AUSTRIAMICROSYSTEMS AG |
| 元件分类： | DC/DC变换器 |
| 英文描述： | 42V DCDC for OLED; Package Type: TDFN(3x3)-10 |
| 封装： | TDFN(3x3)-10 |
| 文件页数： | 12/19页 |
| 文件大小： | 1807K |
| 代理商： | AS1344-BTDT |
www.austriamicrosystems.com
Revision 1.05
12 - 19
AS1344
Datasheet - Application Information
Thermal Protection
To protect the device from short circuit or excessive power dissipation of the auxiliary NPNs, the integrated thermal
protection switches off the device when the junction temperature (T
J
) reaches 140oC (typ). When T
J
decreases to
approximately 135oC, the device will resume normal operation. If the thermal overload condition is not corrected, the
device will switch on and off while maintaining T
J
within the range between 135 and 140oC.
Setting Output Voltage
Output voltage can be adjusted by connecting a voltage divider between pins
VOUT
and FB
(see Figure 35)
.
Figure 35. Typical Application
The output voltage can adjusted by selecting different values for R
1
and R
2
. For R
2
, select a value between 10k and
200k
Ω
.
Calculate R
1
by:
R
1
R
2
=
Where:
V
OUT
= 5.5V to 42V, V
FB
= 1.25V; V
OUT
> V
IN
The input bias current of FB has a maximum value of 100nA which allows for large-value resistors. For less than 1%
error, the current through R
2
should be 100 times the feedback input bias current (I
FB
). That’s why the feeback current
can be neglected in the calculation of V
OUT
.
Note:
For the optimal operation condition the following ratio between V
OUT
and V
IN
should be used:
V
OUT
1
EN
3
GND
4
V
CC
10
FB
6
LX
On
Off
R
1
2.2M
Ω
V
OUT
= 18V
AS1344
L
1
6.8μH
C
1
10μF
V
CC
= 0.9V
to 3.6V
D1
C
OUT
4.7μF
R
2
165k
Ω
7
SWOUT
5
PGND
9
VOUT
2
POK
R
3
100k
Ω
8
VIN
R
V
(EQ 2)
V
FB
--------------
1
–
(EQ 3)
V
IN
÷
12
≤
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