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PDF A8160A Data sheet ( Hoja de datos )
| Número de pieza | A8160A | |
| Descripción | LED BACKLIGHT DRIVER ASYNCHRONIES BOOST | |
| Fabricantes | AiT Semiconductor | |
| Logotipo |  |
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AiT Semiconductor Inc.
www.ait-ic.com
A8160A
LED BACKLIGHT DRIVER
ASYNCHRONIES BOOST FOR 10WLED DRIVER
DESCRIPTION
FEATURES
The A8160A is a step-up DC-DC converter
specifically designed for driving white LEDs with a
VIN Operating Range : 2.5V to 5.5V
Internal Power N-MOSFET Switch
constant current.
Wide Range for PWM Dimming
The internal MOSFET can support up to 10 White
(100Hz to 200kHz)
LEDs for backlighting and OLED power application, 1.0MHz Switch Frequency
and the internal soft start function can reduce the 300mV Feedback Voltage
inrush current.
1.2A SW Current Limit
The A8160A uses current mode, fixed frequency of Minimize the External Component Counts
approximately 1.0MHz architecture to regulate the Internal Compensation
LED current through an external current sense Over Voltage Protection
resistor. The low feedback voltage of 300mV can Available in SOT-26 Packages
minimize power dissipation.
Other features include current limit protection,
APPLICATION
thermal shutdown protection, under-voltage lockout
(UVLO), and over-voltage function.
Cellular Phones and Digital Cameras
PDAs and Smart Phones and MP3 and OLED
The A8160A is available in SOT-26 packages.
Portable Instruments
LCD Display Power
ORDERING INFORMATION
High-light LED Flash
Package Type
Part Number
SOT-26
A8160AE6R-XX
E6
A8160AE6VR-XX
XX: Output voltage
Note
30 = 3.0V
R: Tape & Reel
V: Halogen free Package
AiT provides all RoHS products
Suffix “ V “ means Halogen free Package
TYPICAL APPLICATION
REV1.1
- JUL 2012 RELEASED, AUG 2012 UPDATED -
-1-
1 page  
AiT Semiconductor Inc.
www.ait-ic.com
A8160A
LED BACKLIGHT DRIVER
ASYNCHRONIES BOOST FOR 10WLED DRIVER
TYPICAL PERFORMANCE CHARACTERISTICS
1. η VS IO
2. IQ VS VIN
3. FOSC VS VIN
4. VFB VS VIN
5. VEN VS VIN
6. ILED VS DUTY
REV1.1
- JUL 2012 RELEASED, AUG 2012 UPDATED -
-5-
5 Page 
AiT Semiconductor Inc.
www.ait-ic.com
A8160A
LED BACKLIGHT DRIVER
ASYNCHRONIES BOOST FOR 10WLED DRIVER
Soft-Start
The function of soft-start is made for suppressing the inrush current to an acceptable value at the beginning of
power-on. The A8160A provides a built-in soft-start function by clamping the output voltage of error amplifier
so that the duty cycle of the PWM will be increased gradually in the soft-start period.
Current Limiting
The current flow through inductor as charging period is detected by a current sensing circuit. As the value
comes across the current limiting threshold, the N-MOSFET will be turned off so that the inductor will be
forced to leave charging stage and enter discharging stage. Therefore, the inductor current will not increase
over the current limiting threshold.
OVP/UVLO/OTP
The Over Voltage Protection is detected by a junction breakdown detecting circuit. Once VOUT goes over the
detecting voltage, SW pin stops switching and the power N-MOSFET will be turned off. Then, the VOUT will be
clamped to be near VOVP. As the output voltage is higher than a specified value or input voltage is lower than a
specified value, the chip will enter protection mode to prevent abnormal function. As the die temperature is
higher than 160°C, the chip also will enter protection mode. The power MOSFET will be turned off during
protection mode to prevent abnormal operation.
Capacitor Selection
Input ceramic capacitor of 2.2uF and output ceramic capacitor of 1uF are recommended for the A8160A
applications for driving 10 series WLEDs. For better voltage filtering, ceramic capacitors with low ESR are
recommended. X5R and X7R types are suitable because of their wider voltage and temperature ranges.
Inductor Selection
The recommended value of inductor for 10 WLEDs applications is from 10uH to 47uH. Small size and better
efficiency are the major concerns for portable devices, such as the A8160A used for mobile phone. The
inductor should have low core loss at 1.0MHz and low DCR for better efficiency. The inductor saturation
current rating should be considered to cover the inductor peak current.
Thermal Considerations
For continuous operation, do not exceed absolute maximum operation junction temperature. The maximum
power dissipation depends on the thermal resistance of IC package, PCB layout, the rate of surroundings
airflow and temperature difference between junction to ambient. The maximum power dissipation can be
calculated by following formula:
REV1.1
- JUL 2012 RELEASED, AUG 2012 UPDATED -
- 11 -
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet A8160A.PDF ] | |
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