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PDF APE1912 Data sheet ( Hoja de datos )
| Número de pieza | APE1912 | |
| Descripción | STEP-UP PWM DC/DC CONVERTER | |
| Fabricantes | Advanced Power Electronics | |
| Logotipo |  |
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Advanced Power
Electronics Corp.
FEATURES
Input Voltage：3V to 13V
Output Voltage：3.3V to 20V
Duty Ratio：0% to 85% PWM Control
Oscillation Frequency：500KHz.
Enable and Thermal Shutdown Function.
Internal Current Limit.
Built-in N-channel MOSFET
ESOP-8 & Pb-Free Package.
Halogen Free Product
TYPICAL APPLICATION
APE1912
STEP-UP PWM DC/DC CONVERTER
DESCRIPTION
The APE1912 is high efficient step-up DC/DC
converter. Large output current is possible having a built in
internal N channel MOSFET, and using an external coil and
diode.
The APE1912 can be operated at switching
frequencies of 500 kHz allowing for easy filtering and low
noise, the size of the external components can be reduced.
Output voltage is programmable with 1.0V of standard
voltage supply internal, and using externally connected
components, output voltage (FB) can be set up at will. The
soft-start time can be programmed by outside capacitor; the
function prevents overshoot at startup. Build inside Current
limit, Thermal Shutdown and enable functions.
VCC= 3.0 ~ 4.5V
R1
100K
C1
10uF
C3
0. 1uF
C2
0. 47 uF
L1
2.2uH
U1
EN
Vcc
FB
SS
APE 1912
C8
0.47 uF
SGND
NC
SW
PGND
D1
B 540A
Vout= 5 V
C4
220uF
C5
22uF
R4
12K
VOUT < 8V, VOUT = VFB x (1+R4/R3) , VFB = 1.0V, R3 = 1K
20mΩ < Cout ESR < 80mΩ
R3 R5
3K 470R
C7
0. 1 uF
Data and specifications subject to change without notice
1
20130222V1.1
1 page  
Advanced Power
Electronics Corp.
FUNCTION DESCRIPTION
APE1912
Output Capacitor Selection
When laying out the PC board, the following suggestions should be taken to ensure
proper operation of the APE1912. These items are also illustrated graphically in below.
1. The power traces, including the Source trace, the Schottky and the C1 trace should
be kept short, direct and wide to allow large current flow.
2. The power ground & RFB ground is keep C4 ’ s ground closed and far away signal
ground.
3. The signal ground trance is distant from power ground trance.
4. The exposed pad is connecting to SW trace closely and widely. (Reduce IC
temperature)
5. Do not trace signal line under inductor.
5
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet APE1912.PDF ] | |
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