|
|
PDF APW7136A Data sheet ( Hoja de datos )
| Número de pieza | APW7136A | |
| Descripción | Step-Up Converter | |
| Fabricantes | Anpec | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de APW7136A (archivo pdf) en la parte inferior de esta página. Total 15 Páginas | ||
|
No Preview Available !
APW7136A/B/C
1MHz, High-Efficiency, Step-Up Converter for 2 to 8 White LEDs
Features
• Wide Input Voltage from 2.7V to 6V
• 0.25V Reference Voltage
• Fixed 1MHz Switching Frequency
• High Efficiency up to 87%
www.DataSheet4U•.com 100Hz to 100KHz PWM brightness control fre-
quency
• Open-LED Protection
• Under Voltage Lockout Protection
• Over Temperature Protection
• <1µA Quiescent Current during Shutdown
• SOT-23-6 Package
• Lead Free Available (RoHS Compliant)
Applications
• White LED Display Backlighting
• Cell Phone and Smart Phone
• PDA, PMP, MP3
• Digital Camera
Pin Configuration
SOT-23-6 Top View
LX 1
GND 2
FB 3
6 VIN
5 OVP
4 EN
General Description
The APW7136A/B/C is a current-mode and fixed frequency
boost converter with an integrated N-FET to drive up to 8
white LEDs in series.
The series connection allows the LED current to be iden-
tical for uniform brightness. Its low on-resistance of N-
FET and feedback voltage reduce power loss and achieves
high efficiency. Fast 1MHz current-mode PWM operation
is available for input and output capacitors and a small
inductor while minimizing ripple on the input supply. The
OVP pin monitors the output voltage and stop switching if
exceeds the over-voltage threshold. An internal soft-start
circuit eliminates the inrush current during start-up.
The APW7136A/B/C also integrates under-voltage
lockout, over-temperature protection and current limit
circuits. The APW7136/A/B/C is available in a SOT-23-6
package.
Simplified Application Circuit
VIN
C1
4.7µF
OFF ON
L1
22µH
6 VIN
LX 1
2
GND
OVP 5
4
EN
FB 3
VOUT
C2
1µF Up to 8
WLEDs
R1
12Ω
Ordering and Marking Information
Note: ANPEC lead-free products contain molding compounds/die attach materials and 100% matte tin plate termination finish; which are fully
compliant with RoHS and compatible with both SnPb and lead-free soldering operations. ANPEC lead-free products meet or exceed the lead-
free requirements of IPC/JEDEC J STD-020C for MSL classification at lead-free peak reflow temperature.
ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and
advise customers to obtain the latest version of relevant information to verify before placing orders.
Copyright © ANPEC Electronics Corp.
Rev. A.2 - Jan., 2008
1
www.anpec.com.tw
1 page  
APW7136A/B/C
Typical Operating Characteristics
(Refer to Figure 1 in the section “Typical Application Circuits”, VIN=3.6V, TA=25oC, 8WLEDs unless otherwise specified)
Switching Frequency vs. Supply Voltage
1.2
1.1
1
www.DataSheet4U.com 0.9
0.8
0.7
0.6
0.5
0.4
2.5
3
3.5 4
4.5 5
5.5 6
Maximum Duty Cycle vs. Supply Voltage
100
90
80
70
60
50
40
2.5 3 3.5 4 4.5 5 5.5 6
Operating Waveforms
(Refer to the application circuit in the section “Typical Application Circuits”, VIN=3.6V, TA=25oC, 8WLEDs unless otherwise speci-
fied )
Start-up
Start-up
VEN
VIN
VOUT
IIN, 0.1A/Div
VEN
VIN
VOUT
IIN, 0.1A/Div
8WLEDs, L=22µH, VIN=3.6V, ILED=20mA
6WLEDs, L=22µH, VIN=3.6V, ILED=20mA
Copyright © ANPEC Electronics Corp.
Rev. A.2 - Jan., 2008
5
www.anpec.com.tw
5 Page 
APW7136A/B/C
Application Information (Cont.)
Output Capacitor Selection (Cont.)
For ceramic capacitor application, the output voltage ripple
is dominated by the ∆VCOUT. When choosing the input and
output ceramic capacitors, the X5R or X7R with their
good temperature and voltage characteristics are
recommended.
www.DataSheet4UD.cioomde Selection
To achieve high efficiency, a Schottky diode must be used.
The current rating of the diode must meet the peak cur-
rent rating of the converter.
Setting the LED Current
In figure 1, the converter regulates the voltage on FB pin,
connected with the cathod of the lowest LED and the cur-
rent-sense resistor R1, at 0.25V (typical). Therefore the
current (I ), flowing via the LEDs and the R1, is calcu-
LED
lated by the following equation:
ILED = 0.25V/R1
Recommended Inductor Selection
Designator Manufacturer
Part Number
L1 GOTREND
GTSD32
Inductance (µH) Max DCR (ohm)
22 0.592
Saturation
Current (A)
0.52
Dimensions
L x W x H (mm3)
3.85 x 3.85 x 1.8
Recommended Capacitor Selection
Designator Manufacturer
Part Number
C1 Murata GRM188R60J475KE19
C2 Murata GRM21BR71H105KA12
Capacitance (µF)
4.7
1.0
TC Code
X5R
X7R
Rated Voltage (V)
6.3
50
Case size
0603
0805
Recommended Diode Selection
Designator Manufacturer Part Number
D1
Zowie
MSCD106
D1
Zowie
MSCD104
Maximum average forward
rectified current (A)
1.0
1.0
Maximum repetitive peak
reverse voltage (V)
60
40
Case size
0805
0805
Layout Consideration
For all switching power supplies, the layout is an impor-
tant step in the design; especially at high peak currents
and switching frequencies. If the layout is not carefully
done, the regulator might show noise problems and duty
cycle jitter.
1. The input capacitor should be placed close to the VIN
and GND. Connecting the capacitor with VIN and GND
pins by short and wide tracks without using any vias for
filtering and minimizing the input voltage ripple.
2. The inductor should be placed as close as possible to
the LX pin to minimize length of the copper tracks as
well as the noise coupling into other circuits.
3. Since the feedback pin and network is a high imped-
ance circuit, the feedback network should be routed
away from the inductor. The feedback pin and feed-
back network should be shielded with a ground plane
or track to minimize noise coupling into this circuit.
4. A star ground connection or ground plane minimizes
ground shifts and noise is recommended.
Via To OVP
To Anode of
WLEDs
VOUT
D1
LX
From Cathod
of WLEDs
L1
C1
VIN
Via To VOUT
VEN
VADJ
Via To GND
Refer to Fig. 3
Optimized APW7136 Layout
Copyright © ANPEC Electronics Corp.
Rev. A.2 - Jan., 2008
11
www.anpec.com.tw
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet APW7136A.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| APW7136A | Step-Up Converter | Anpec |
| APW7136B | Step-Up Converter | Anpec |
| APW7136C | Step-Up Converter | Anpec |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |