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PDF AP3031 Data sheet ( Hoja de datos )
| Número de pieza | AP3031 | |
| Descripción | WHITE LED STEP-UP CONVERTER | |
| Fabricantes | BCD Semiconductor | |
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Data Sheet
WHITE LED STEP-UP CONVERTER
General Description
Features
AP3031
The AP3031 is an inductor-based DC/DC boost con-
verter designed to drive LED arrays. 1.4A switching
current allows AP3031 to be used in different 7' to 10'
LCD panel backlights (3*13 LED arrays typically).
A constant frequency 1MHz PWM control scheme is
employed in this IC, which means tiny external com-
ponents can be used. Specifically, 1mm tall 4.7µH
inductor and 0.47µF output capacitor for the typical
application is sufficient.
The over output voltage protection is equipped in
AP3031, which protects the IC under open load condi-
tion. The AP3031 includes UVLO, soft-start, current
limit and OTSD to protect the circuit.
The AP3031 is available in standard SOT-23-6, TSOT-
23-6 and SOIC-8 packages.
· Up to 92% Efficiency
(VIN=9V, IOUT=260mA)
· Up to 84% Efficiency
(VIN=5V, IOUT=260mA)
· Fast 1MHz Switching Frequency
· Wide Input Voltage Range: 2.7V to 16V
· Low 200mV Feedback Voltage
· Output Over Voltage Protection
· Cycle by Cycle Current Limit: 1.4A
· Built-in Soft-start
· Built-in Standby Mode to Achieve High Fre-
quency PWM Dimming
· Built-in Thermal Shutdown Function
· Under Voltage Lockout
Applications
· 7' to 10' LCD Panels
· Digital Photo Frame
· GPS Receiver
· EPC
· PDVD
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SOT-23-6
TSOT-23-6
SOIC-8
Apr. 2009 Rev. 1. 3
Figure 1. Package Types of AP3031
BCD Semiconductor Manufacturing Limited
1
1 page  
WHITE LED STEP-UP CONVERTER
Electrical Characteristics
(VIN=5.0V, VCTRL =5.0V, TA=25oC, unless otherwise specified.)
Parameter
Operating Voltage
Feedback Voltage (Note 2)
FB Pin Bias Current
Quiescent Current
Shutdown Quiescent Current
Switching Frequency
Maximum Duty Cycle
Switch Current Limit (Note 3)
Switch VCE Saturation Voltage
Switch Leakage Current
CTRL Pin Voltage
CTRL Pin Bias Current
OVP Voltage
Soft-start Time
Standby Time
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Thermal Shutdown
Thermal Resistance
(Junction to Case)
Symbol
VIN
VFB
IFB
IQ
ISHDN
f
DMAX
ILIMIT
VCESAT
VCTRL
ICTRL
VOVP
tSS
tSTB
TOTSD
θJC
Conditions
IOUT=20mA, 3 LEDs,
TA=-40oC to 85oC
VFB=VIN, no switching
VCTRL=0V
D=60%
ISW=0.6A
VSW=16V
Active high
Active low
Data Sheet
AP3031
Min Typ Max Unit
2.7 16 V
188 200 212 mV
35 100 nA
3.0 4.0 5.0 mA
20 50 80 µA
0.75 1
1.3 MHz
90 93
%
1.2 1.4
A
300 mV
0.01 5
µA
1.8
V
0.5
35 60 85 µA
17 V
250 µs
0.7 ms
155 oC
60 oC/W
Note 2: The bold type specifications of full temperature range are guaranteed by design (GBD).
Note 3: The switch current limit is related to duty cycle. Please refer to Figure 15 for detail.
Apr. 2009 Rev. 1. 3
BCD Semiconductor Manufacturing Limited
5
5 Page 
Data Sheet
WHITE LED STEP-UP CONVERTER
Application Information (Continued)
changing the feedback voltage to get appropriate duty
and luminous intensity is also useful.
AP3031
Comparing with all kinds of PWM signal control, this
method features a stable output voltage and LEDs
current. Please refer to Figure 22.
(1) Adding a Control Signal to CTRL Pin
Adding a PWM signal to CTRL pin directly, the
AP3031 is turned on and off by this signal. When the
PWM frequency is lower than 1kHz(Typ.), the IC
works in the soft-start mode to dimming the light. On
contrary, when the PWM frequency is higher than
1kHz(Typ.), the IC works in the standby mode: the
converter ceaselessly switches off and directly starts to
achieve light dimming. This standby function allows
AP3031 to support high frequency dimming (up to
25kHz or higher) to avoid audio noise. More details
please refer to Figure 20 and Figure 21.
AP3031
CTRL
AP3031
FB
VDC
R3
R2
Effective
Feedback Voltage
R1
Figure 22. Dimming Control
Using DC Voltage
Second, using a filtered PWM signal can do it. The
filtered PWM signal can be considered as a varying
and adjustable DC voltage, please refer to Figure 23.
Figure 20. Dimming Control
Using a PWM Signal in CTRL Pin
PWM
R4
AP3031
FB
R3
C
R2
Effective
Feedback Voltage
R1
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Figure 23. Dimming Control
Using Filtered PWM Voltage
µ
Figure 21. High Frequency (25kHz)
Dimming Waveform
(2) Changing the Effective Feedback Voltage
There are two popular methods to change the effective
feedback voltage.
First, adding a constant DC voltage through a resistor
divider to FB pin can control the dimming. Changing
the DC voltage or resistor between the FB Pin and the
DC voltage can get appropriate luminous intensity.
Apr. 2009 Rev. 1. 3
11
BCD Semiconductor Manufacturing Limited
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet AP3031.PDF ] | |
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