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A7320 Schematic ( PDF Datasheet ) - AiT Semiconductor

Teilenummer A7320
Beschreibung 2A 23V SYNCHRONOUS RECTIFIED STEP-DOWN CONVERTER
Hersteller AiT Semiconductor
Logo AiT Semiconductor Logo 




Gesamt 17 Seiten
A7320 Datasheet, Funktion
AiT Semiconductor Inc.
www.ait-ic.com
A7320
DC-DC CONVERTER/ BUCK (STEP-DOWN)
2A, 23V SYNCHRONOUS RECTIFIED STEP-DOWN CONVERTER
DESCRIPTION
The A7320 is a monolithic synchronous buck
regulator. The device integrates 130mΩ
MOSFETS that provide 2A continuous load
current over a wide operating input voltage of
4.75V to 23V. Current mode control provides
fast transient response and cycle-by-cycle
current limit.
An adjustable soft-start prevents inrush current
at turn-on. Shutdown mode drops the supply
current to 1μA.
This device, available in an 8-pin SOP package,
provides a very compact system solution with
minimal reliance on external components.
A7320 is available in SOP8 Package
ORDERING INFORMATION
Package Type
Part Number
SOP8
M8
A7320M8R
A7320M8VR
Note
V: Halogen free Package
R : Tape & Reel
AiT provides all RoHS products
Suffix “ V “ means Halogen free Package
FEATURES
2A Output Current
Wide 4.75V to 23V Operating Input Range
Integrated 130mΩ Power MOSFET Switches
Output Adjustable from 0.923V to 20V
Up to 93% Efficiency
Programmable Soft-Start
Stable with Low ESR Ceramic Output Capacitors
Fixed 450KHz Frequency
Cycle-by-Cycle Over Current Protection
Input Under Voltage Lockout
Available in SOP8 Package
APPLICATIONS
Distributed Power Systems
Networking Systems
FPGA, DSP, ASIC Power Supplies
Notebook Computers
TYPICAL APPLICATION
REV1.1
- FEB 2012 RELEASED, JUN 2012 REVISED –
-1-






A7320 Datasheet, Funktion
AiT Semiconductor Inc.
www.ait-ic.com
A7320
DC-DC CONVERTER/ BUCK (STEP-DOWN)
2A, 23V SYNCHRONOUS RECTIFIED STEP-DOWN CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS
VIN = 12V, VO = 3.3V, L = 10μH, C1 = 10μF, C2 = 22μF, TA = +25°C, unless otherwise noted
Figure 1. Steady State Test
Figure 2. Startup through Enable
VIN = 12V, VOUT = 3.3V, IOUT = 0A, IIN= 8.2mA
VIN = 12V, VOUT = 3.3V, IOUT = 1A (Resistance Load)
Figure 3. Shutdown through Enable
VIN = 12V, VOUT = 3.3V,IOUT = 1A (Resistance Load)
Figure 4. Heavy Load Operation
2A Load
REV1.1
- FEB 2012 RELEASED, JUN 2012 REVISED –
-6-

6 Page









A7320 pdf, datenblatt
AiT Semiconductor Inc.
www.ait-ic.com
A7320
DC-DC CONVERTER/ BUCK (STEP-DOWN)
2A, 23V SYNCHRONOUS RECTIFIED STEP-DOWN CONVERTER
Output Capacitor
The output capacitor is required to maintain the DC output voltage. Ceramic, tantalum, or low ESR electrolytic
capacitors are recommended. Low ESR capacitors are preferred to keep the output voltage ripple low. The
output voltage ripple can be estimated by:
Where C2 is the output capacitance value and RESR is the equivalent series resistance (ESR) value of the
output capacitor. In the case of ceramic capacitors, the impedance at the switching frequency is dominated by
the capacitance. The output voltage ripple is mainly caused by the capacitance. For simplification, the output
voltage ripple can be estimated by:
In the case of tantalum or electrolytic capacitors, the ESR dominates the impedance at the switching
frequency. For simplification, the output ripple can be approximated to:
The characteristics of the output capacitor also affect the stability of the regulation system. The A7320 can be
optimized for a wide range of capacitance and ESR values.
Compensation Components
A7320 employs current mode control for easy compensation and fast transient response.
The system stability and transient response are controlled through the COMP pin. COMP pin is the
output of the internal transconductance error amplifier. A series capacitor-resistor combination sets
a pole-zero combination to control the characteristics of the control system.
The DC gain of the voltage feedback loop is given by:
Where AVEA is the error amplifier voltage gain; GCS is the current sense transconductance and RLOAD
is the load resistor value. The system has two poles of importance. One is due to the compensation
capacitor (C3) and the output resistor of the error amplifier, and the other is due to the output
capacitor and the load resistor. These poles are located at:
REV1.1
- FEB 2012 RELEASED, JUN 2012 REVISED –
- 12 -

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