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參數(shù)資料
| 型號： | AIC1652CS |
| 廠商： | Analog Integrations Corporation |
| 英文描述： | MICROPOWER INVERTING DC/DC CONVERTER |
| 中文描述： | 微功耗倒轉(zhuǎn)DC / DC轉(zhuǎn)換器 |
| 文件頁數(shù)： | 4/6頁 |
| 文件大?。?/td> | 57K |
| 代理商： | AIC1652CS |
AIC1652
MICROPOWER INVERTING DC/DC CONVERTER
SPEC NO: DS-1652-02 DEC 27, 00
ANALOG INTEGRATIONS CORPORATION
www.analog.com.tw
4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C. TEL: (8863)577-2500 FAX:(8863)577-2510
4
n
PIN DE SCR IPTIONS
PIN 1:
VIN
- 2.4V to 7V input supply voltage.
PIN 2:
VREF- 1.22V reference output. Bypass with
a 0.047
μ
F
Sourcing capability is guaranteed to
be greater than 250
μ
A.
capacitor
to
GND.
PIN 3:
SHDN
- Logic input to shutdown the chip.
>1.5V = normal operation,
GND = shutdown
In shutdown mode DLOW and DHI
pins are at high level.
PIN 4:
FB
- Feedback signal input to sense
ground. Connecting a resistor R1 to
V
OUT
and a resistor R2 to V
REF
pin
yields the output voltage:
V
OUT
= -(R1/R2 ) x V
REF
PIN 5:
GND - Power ground.
PIN 6: DLOW - Driver sinking output. Connected to
DHI when using an external P-
channel MOSFET. When using an
external PNP bipolar transistor,
connect a resistor RB from this pin
to DHI. RB value depends on V
IN
,
inductor and PNP bipolar transistor.
By adjusting the RB value, efficiency
can be optimized.
PIN 7: DHI
- Driver sourcing output. Connect to
gate of the external P-channel
MOSFET or base of the PNP bipolar
transistor.
PIN 8:
CL
- Current-limit input. This pin clamps
the switch peak current to prevent
over-current damage to the external
switch.
n
APPLICATION INFOR MATIONS
2
4
6
8
0
0.2
0.4
0.6
0.8
100
μ
H
120
μ
H
150
μ
H
180
μ
H
220
μ
H
V
IN
(V)
Max. Output Power vs V
IN
Inductor Value
Typical Application Circuit
M
The typical application circuit generates an adjustable
negative voltage for contrast bias of LCD displays. Effi-
ciency and output power can be optimized by using ap-
propriate inductor and switch. The following formulas
provide a guideline for determining the optimal component
values:
L
=
(11.1 0.15
V )
IN
V
×
I
V
IN
OUT
OUT
×
×
PNP
:
V
V
V
CEO
IN
OUT
I
V
>
+
I
200
C,MAX
OUT
IN
≥
×
V
0.4V at I
= 200
I
V
CE
C
OUT
IN
<
×
and
3 x L x (V
IN
- 0.8)
10
b
=
RB
where, units: V
IN
& V
OUT
in V, I
OUT
in A, L in
μ
H,
RB in
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