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參數(shù)資料
| 型號(hào)： | ISL97702IRZ-T7 |
| 廠商： | INTERSIL CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Boost with Dual Reference Outputs |
| 中文描述： | 1.2 A SWITCHING REGULATOR, 1100 kHz SWITCHING FREQ-MAX, DSO10 |
| 封裝： | 3 X 3 MM, ROHS COMPLIANT, MO-229, DFN-10 |
| 文件頁數(shù)： | 11/13頁 |
| 文件大?。?/td> | 489K |
| 代理商： | ISL97702IRZ-T7 |
11
FN7462.0
October 13, 2005
Typical Application
Typical applications are passive- or active-matrix organic
light emitting diode displays (PMOLED, AMOLED) in
handheld devices. Applications with low power or screen
saver/ reduced brightness modes are also directly
supported.
Motivation: In the low power mode the OLED display
brightness (~pixel current) is reduced so that the display
drivers can operate with equally reduced power. Usually the
supply voltage is kept at the same level, although the pixel
voltage drops by several volts when the pixel current levels
are reduced. Here a further power reduction can be
achieved if the supply voltage for the display drivers is
reduced according to the pixel diode characteristic.
The ISL97702 allows selection between a nominal and a
reduced output voltage level in order to supply more
effectively OLED display drivers.
Components Selection
The input capacitance is normally 10μf~15μF and the output
capacitor is 3.3μf to 6.6μF. X5R or X7R type of ceramic
capacitor with correct voltage rating is recommended. The
output capacitor value will affect the output voltage ripple.
Higher value of the output capacitor, lower ripple of the
output voltage.
When choosing an inductor, make sure the inductor can
handle the average and peak currents given by following
formulas (80% efficiency assumed):
Where:
I
L
is the peak-to-peak inductor current ripple in Amperes
L inductance in H
f
OSC
switching frequency, typically 1.0MHz
Optimal combination of the boost inductor L and the output
capacitor Cout are listed in table:
Recommended Inductor and Ceramic capacitor
manufactures are listed in the following table:
FIGURE 20. ISL97702 APPLICATION BOARD
GND
1
VDDOUT
2
VDD
3
NSYNC
4
FB0
5
FB1
6
SEL
7
NEN
8
VOUT
9
LX
10
U1
L1
6.8μH
C1
100n
C2
10μ
J1
VDD_IN
J2
GND_IN
J3
GND_OUT
J4
NSYNC
J5
J6
J7
VOUT
R1
390K
R2
OPEN
R3
OPEN
R4
OPEN
R5
26.1K
R6
39K
C3
OPEN
C4
OPEN
C5
OPEN
C8
100n
1
3
2
J1
1
3
2
J2
VDD
VDD
VDD
JP3
VDD
C6
1nF/50V
C7
3.3μF/50V
C9
4.7μ/10V
ISL97702
SEL
NEN
I
LAVG
I
V
IN
---------------------------------
=
(EQ. 1)
INDUCTOR (μH)
CAPACITOR (μF)
MIN
MAX
4.7
2.2
10
6.8
3.3
10
10
4.7
10
15
6.8
10
INDUCTOR
CERAMIC CAPACITOR
Sumida: www.sumida.com
Taiyo Yuden: www.t-yuden.com
TDK:
www.tdk.co.jp
AVX:
www.avxcorp.com
Toko:
www.tokoam.com
Murata:
www.murata.com
I
LPK
I
LAVG
1
2
--
+
I
L
=
(EQ. 2)
I
L
V
OUT
OSC
V
V
–
(
)
--------------------------------------------------
=
(EQ. 3)
ISL97702
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