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PDF AP5101 Data sheet ( Hoja de datos )
| Número de pieza | AP5101 | |
| Descripción | 1.5A Step-Down Converter | |
| Fabricantes | Diodes Incorporated | |
| Logotipo |  |
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AP5101www.DataSheet4U.com
1.5A Step-Down Converter with 1.4MHz Switching
Frequency
Description
Pin Assignments
The AP5101 is a current mode step-down converter with a
built-in power MOSFET to enable smallest solution size
power conversion.
With the low series resistance power switch it enables a
constant output current of up to 1.5A over a wide input supply
range. The load and line regulation has excellent response
time over the operating input voltage and temperature range.
The AP5101 is self protected, through a cycle-by-cycle
current limiting algorithm and an on chip thermal protection.
The AP5101 will provide the voltage conversion with a low
count of widely available standard external components.
The AP5101 is available in SO-8 package.
( Top View )
SW 1
8 GND
IN 2
7 BST
EN 3
6 COMP
GND 4
SO-8
5 FB
Features
Applications
• VIN 4.75 to 22V
• 1.5A Peak Output Current
• Stable with Low ESR Ceramic Output Capacitors
• External compensation
• Up to 92% Efficiency
• 0.1µA Shutdown Mode
• Fixed 1.4MHz Frequency
• Thermal Shutdown
• Cycle-by-Cycle Over Current Protection
• Output Adjustable from 0.81V to 15V
• SO-8: Available in “Green” Molding Compound
(No Br, Sb)
• Lead Free Finish/ RoHS Compliant (Note 1)
• Distributed Power Systems
• Battery Charger
• Pre-Regulator for Linear Regulators
• WLED Driver
Note: 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at
http://www.diodes.com/products/lead_free.html.
Typical Application Circuit
Input
4.75V to 22V
C4
C1
OFF
ON
3 EN
2
IN
7
BST
1
SW
AP5101
5
FB
GND
COMP
4,8 6
C3
R3
L1
R1
D1
R2
Output
3.3V 1.5A
C2
AP5101
Document number: DS32258 Rev. 1 - 2
Figure 1 Typical Application Circuit
1 of 15
www.diodes.com
July 2010
© Diodes Incorporated
1 page  
AP5101www.DataSheet4U.com
1.5A Step-Down Converter with 1.4MHz Switching
Frequency
Electrical Characteristics (VIN = 12V, TA = +25°C, unless otherwise noted)
Symbol
VFB
IFB
R DS(ON)
GCS
AVEA
GEA
fSW
tON
Parameter
Feedback Voltage
Feedback Current
Switch-On Resistance (Note 5)
Switch Leakage
Current Limit (Note 5)
Current Sense Transconductance
Output Current to Comp Pin Voltage
Error Amplifier Voltage Gain (Note 5)
Error Amplifier Transconductance
Oscillator Frequency
Fold-back Frequency
Maximum Duty Cycle
Minimum On-Time (Note 5)
Under Voltage Lockout
Threshold Rising
Under Voltage Lockout Threshold
Hysteresis
EN Input Low Voltage
EN Input High Voltage
EN Input Current
IS Supply Current (Shutdown)
IQ Supply Current (Quiescent)
Thermal Shutdown (Note 5)
Note: 5. Guaranteed by design
Test Conditions
4.75V ≤ VIN ≤ 22V
VFB = 0.8V
Min
0.790
VEN = 0V, VSW = 0V
ΔIC = ±10μA
VFB = 0.6V
VFB = 0V
VFB = 0.6V
1.1
3.8
VEN = 2V
VEN = 0V
VEN = 0V
VEN = 2V, VFB = 1V
1.2
Typ.
0.810
0.1
0.35
2.5
1.3
400
850
1.4
500
65
100
4.0
100
2.1
0.1
0.1
0.5
150
Max
0.830
10
1.7
4.2
0.4
1.0
0.7
Unit
V
µA
Ω
µA
A
A/V
V/V
uA/V
MHz
kHz
%
ns
V
mV
V
V
µA
µA
µA
mA
°C
AP5101
Document number: DS32258 Rev. 1 - 2
5 of 15
www.diodes.com
July 2010
© Diodes Incorporated
5 Page 
AP5101www.DataSheet4U.com
1.5A Step-Down Converter with 1.4MHz Switching
Frequency
Applications Information (Continued)
Input Capacitor
The input capacitor reduces the surge current drawn from the input supply and the switching noise from the device. The input
capacitor has to sustain the ripple current produced during the on time on the upper MOSFET. It must hence have a low ESR
to minimize the losses.
Due to large dI/dt through the input capacitors, electrolytic or ceramics should be used. If a tantalum must be used, it must be
surge protected. Otherwise, capacitor failure could occur. For most applications, a 4.7µF ceramic capacitor is sufficient.
Output Capacitor
The output capacitor keeps the output voltage ripple small, ensures feedback loop stability and reduces the overshoot of the
output voltage. The output capacitor is a basic component for the fast response of the power supply. In fact, during load
transient, for the first few microseconds it supplies the current to the load.
The converter recognizes the load transient and sets the duty cycle to maximum, but the current slope is limited by the inductor
value.
Maximum capacitance required can be calculated from the following equation:
Co
=
L(Iout
+
ΔIinductor
2
)2
(Δ V + Vout )2 − Vout 2
Where ΔV is the maximum output voltage overshoot.
ESR of the output capacitor dominates the output voltage ripple. The amount of ripple can be calculated from the equation
below:
Vout capacitor = ΔIinductor × ESR
An output capacitor with ample capacitance and low ESR is the best option. For most applications, a 22µF ceramic capacitor
will be sufficient.
External Diode
The external diode’s forward current must not exceed the maximum output current. Since power dissipation is a critical factor
when choosing a diode, it can be calculated from the equation below:
Pdiode
= (1 −
VOUT
VIN
)
×
IOUT
× 0.3V
Note: 0.3V is the voltage drop across the Schottky diode. A diode that can withstand this power dissipation must be chosen.
PC Board Layout
This is a high switching frequency converter. Hence attention must be paid to the switching currents interference in the layout.
Switching current from one power device to another can generate voltage transients across the impedances of the
interconnecting bond wires and circuit traces. These interconnecting impedances should be minimized by using wide, short
printed circuit traces. The input capacitor needs to be as close as possible to the IN and GND pins. The external feedback
resistors should be placed next to the FB pin.
AP5101
Document number: DS32258 Rev. 1 - 2
11 of 15
www.diodes.com
July 2010
© Diodes Incorporated
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet AP5101.PDF ] | |
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