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PDF AIC1896 Data sheet ( Hoja de datos )
| Número de pieza | AIC1896 | |
| Descripción | 1.4MHz SOT23 Current-Mode Step-Up DC/DC Converter | |
| Fabricantes | Analog Intergrations Corporation | |
| Logotipo |  |
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AIC1896
1.4MHz SOT23 Current-Mode Step-Up DC/DC
Converter
FEATURES
Fixed Frequency 1.4MHz Current-Mode PWM
Operation.
Adjustable Output Voltage up to 30V.
Guaranteed 13V/ 200mA Output with 5V Input.
2.5V to 10V Input Range.
Maximum 0.1µA Shutdown Current.
Programmable Soft-Start.
Tiny Inductor and Capacitors are allowed.
Space-Saving SOT-23-6 Package.
APPLICATIONS
White LED Backlight.
OLED Driver.
DESCRIPTION
AIC1896 is a current-mode pulse-width modulation
(PWM), step-up DC/DC Converter. The built-in high
voltage N-channel MOSFET allows AIC1896 for
step-up applications with up to 30V output voltage,
as well as for Single Ended Primary Inductance
Converter (SEPIC) and other low-side switching
DC/DC converter.
The high switching frequency (1.4MHz) allows the
use of small external components. The Soft-Start
function is programmable with an external capacitor,
which sets the input current ramp rate.
The AIC1896 is available in a space-saving
SOT-23-6 package.
TYPICAL APPLICATION CIRCUIT
VIN
3.3V or
4.2V
C1
4.7µF
OFF ON
L D1
CH521S-30
AIC1896
ZD1
BZV55-B12
11.8V~12.2V
6 IN
LX 1
4 SHDN FB 3
SS GND
52
R2
1KΩ
C2
0.033µF
C3
1µF
ILED
R1
62
86
84
82
80
78 VIN=4.2V
76 VIN=3.3V
74
72 L: GTSK-51-150M (15µH)
70 L: GTSK-51-100M (10µH)
68
2 4 6 8 10 12 14 16 18
LED Current (mA)
Fig. 1 Li-Ion Powered Driver for three white LEDs
20
Analog Integrations Corporation
Si-Soft Research Center
3A1, No.1, Li-Hsin Rd. I, Science Park, Hsinchu 300, Taiwan, R.O.C.
TEL: 886-3-5772500
FAX: 886-3-5772510 www.analog.com.tw
DS-1896P-04 010405
1
1 page  
AIC1896
TYPICAL PERFORMANCE CHARACTERISTICS
1.50
1.45
VIN=3.6V
1.40
1.35
1.30
1.25
1.20
-40
-20
0
20 40 60 80 100
Temperature (°C)
Fig. 3 Switching Frequency vs. Temperature
1.50
TA=25°C
1.45
1.40
1.35
1.30
2
3 4 5 6 7 8 9 10
Supply Voltage (V)
Fig. 4 Frequency vs. Supply Voltage
11
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1.0
0.9
0.8
2
3 4 5 6 7 8 9 10
Supply Voltage (V)
Fig. 5 RDSON vs. Supply Voltage
11
12.5
VIN=3.6V
12.0
11.5
11.0
10.5
1
10 100
Output Current (mA)
Fig. 7 Load Regulation (L1=22μH)
5.50
VIN=3.6V
5.25
5.00
4.75
4.50
1
10 100
Output Current (mA)
Fig. 6 Load Regulation (L1=10μH)
2.4
2.2 FB=1.0V
2.0 SHDN=1.0V
1.8
1.6
1.4
1.2
1.0
0.8
0.6
23456789
Supply Voltage (V)
Fig. 8 Switching Current
10 11
5
5 Page 
AIC1896
are dimmed by FB pin and turned off completely by
SHDN .
2. Using a DC Voltage
For some applications, the preferred method of a
dimming control uses a variable DC voltage to
adjust LED current. A dimming control using a DC
voltage is shown as Fig. 22. As DC voltage
increases, the voltage drop over R2 increases and
the voltage drop over R1 decreases.
Cautiously selecting R2 and R3 is essential so that
the current from the variable DC source is much
smaller than the LED current and much larger than
the FB pin bias current. With a VDC ranging from
0V to 5V, the selection of resistors in Fig. 22
results in dimming control of LED current from
20mA to 0mA, respectively.
3. Using a Filtered PWM Signal
Filtered PWM signal can be considered as an
adjustable DC voltage. It can be used to replace
the variable DC voltage source in dimming control.
The circuit is shown in Fig. 23.
VIN
3.3V to 4.2V
C1
4.7µF
L1 10µH D1 CH521S-30
SLF6025-100M1R0
ZD1
BZV55-B24
U1 AIC1896 23.5V~24.5V
6 IN
LX 1
4
OFF ON
SHDN FB
SS GND
52
3
R2
1KΩ
C2
0.033µF
C3
1µF
IOUT=ILED=20mA
R1
62Ω
Fig. 20 White LED Driver with Open-Circuit Protection
PWM
AIC1896
IN LX
SHDN FB
SS GND
C2
0.033µF
ZD1
R2
1KΩ
R1
62Ω
OFF
AIC1896
IN LX
ON SHDN FB
SS GND
C2
0.033µF
ZD1
R2
1K
R3
30K
PWM
(a) (b)
Fig. 21 Dimming Control Using a PWM Signal
R1
62
11
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| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet AIC1896.PDF ] | |
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