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PDF AP3130E3036ES6 Data sheet ( Hoja de datos )
| Número de pieza | AP3130E3036ES6 | |
| Descripción | High Performance Asynchronies Boost | |
| Fabricantes | Chipown | |
| Logotipo |  |
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AP3130
Chipown
Small Package, High Performance
Asynchronies Boost for 10 WLED Driver
General Description
The AP3130 is a step-up DC/DC converter specifically
designed for driving white LEDs with a constant current.
The internal MOSFET can support up to 10X5 White LEDs
for backlighting application, and the internal soft start
function can reduce the inrush current. The AP3130 uses
current mode, fixed frequency of approximately 1.0MHz
architecture to regulate the LED current through an external
current sense resistor. The low feedback voltage of 300mV
can minimize power dissipation.
Other features include current limit protection, thermal
shutdown protection, under-voltage lockout (UVLO), and
over-voltage function.
The AP3130 is available in space saving SOT-23-6L
package.
Applications
z Cellular Phones and Digital Cameras
z PDAs and Smart Phones and MP3 and OLED
z Portable Instruments
z LCD Display Power
z High-light LED Flash
Features
z VIN Operating Range : 2.5V to 5.5V
z Internal Power N-MOSFET Switch
z Wide Range for PWM Dimming (100Hz to
200kHz)
z 1.0MHz Switch Frequency
z 300mV Feedback Voltage
z 2A SW Current Limit
z Minimize the External Component Counts
z Internal Compensation
z Over Voltage Protection
Package
S0T-23-6L
Typical Application Circuit
Figure 1. Basic Application Circuit with AP3130
13/F, Building C, Wangzhuang Technology Innovation Center, Longshan Road, New District, Wuxi Tel: +86(510)85217718 http://www.chipown.com.cn V2.0
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1 page  
AP3130
VEN VS VIN
1.2
1.0
0.8
0.6
0.4
0.2 VENH
VENL
0.0
2.5 3 3.5 4 4.5 5 5.5 6
VIN(V)
Chipown
ILED VS DUTY
18
16
14
12
10
8
6
200Hz
4 2KHz
2
20KHz
200KHz
0
0 10 20 30 40 50 60 70 80 90
DUTY(%)
Ordering Information
Part number
Mark
Package
AP3130E3036ES6
1. XY=date code
P=Package factory
OSXYP1
SOT-23-6L
Applications Information
LED Current Setting
The loop of Boost structure will keep the FB pin voltage
equal to the reference voltage VREF. Therefore, when
RSET connects FB pin and GND, the current flows from
VOUT through LED and RSET to GND will be decided by
the current on RSET, which is equal to following equation.
I LED
=
VREF
RSET
Dimming Control
a. Using a PWM Signal to EN Pin
For the brightness dimming control of the AP3130, the IC
provides typically 300mV feedback voltage when the EN
pin is pulled constantly high. However, EN pin allows a
PWM signal to reduce this regulation voltage by changing
the PWM duty cycle to achieve LED brightness dimming
control. The relationship between the duty cycle and FB
voltage can be calculated as following equation.
VFB = Duty x 300mV
Where
Duty = duty cycle of the PWM signal
300mV = internal reference voltage
As shown in Figure 3, the duty cycle of the PWM signal is
used to cut the internal 300mV reference voltage. An
internal low pass filter is used to filter the pulse signal. And
then the reference voltage can be made by connecting the
output of the filter to the error amplifier for the FB pin
voltage regulation.
However, the internal low pass filter 3db frequency is
500Hz. When the dimming frequency is lower then 500Hz,
VA is also a PWM signal and the LED current is controlled
directly by this signal. When the frequency is higher than
500Hz, PWM is filtered by the internal low pass filter and
the VA approach a DC signal. And the LED current is a DC
current which eliminate the audio noise.
But there is an offset in error amplifier which will cause the
VA variation. In low PWM duty signal situation, the filtered
reference voltage is low and the offset can cause bigger
variation of the output current. For the AP3130, the
minimum duty vs frequency is listed in following table.
Figure 3 Block Diagram of Programmable FB Voltage
Using PWM Signal
Duty Minimun
Dimming frequency <500Hz 4%
Dimming frequency >500Hz 10%
13/F, Building C, Wangzhuang Technology Innovation Center, Longshan Road, New District, Wuxi Tel: +86(510)85217718 http://www.chipown.com.cn V2.0
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| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet AP3130E3036ES6.PDF ] | |
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