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PDF APW1173 Data sheet ( Hoja de datos )
| Número de pieza | APW1173 | |
| Descripción | 2A SWITCH STEP DOWN SWITCHING REGULATOR | |
| Fabricantes | Anpec Electronics Coropration | |
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APW1173
2A SWITCH STEP DOWN SWITCHING REGULATOR
Features
General Description
• 2A Internal Switch
• Operating Input Voltage from 4.8V to 22V
• 3.3V ±2% Reference Voltage
• Output Voltage :
APW1173 - adjustable from 1.235V to 20V
• Low Dropout Operation: 100% Duty Cycle
• 500KHz Internally Fixed Frequency
• Voltage Feed-Forward
• Zero Load Current Operation
• Internal Current Limit
• Inhibit for Zero Current Consumption
• Synchronization
• Protection Against Feedback Disconnection
• Thermal Protection
• External Soft-Start
• Over-Voltage Protection
• Lead Free Available (RoHS Compliant)
Applications
• Consumer: STB, DVD, TV, VCR, Car Radio,
LCD monitors
• Networking: XDSL, Modems, DC-DC Modules
• Computer: Printers, Audio/Graphic Cards,
Optical Storage, Hard Disk Drive
• Industrial: Chargers, Car Battery DC-DC
Converters
The APW 1173 is a step down monolithic power
switching regulator with a switching current limit of
3.8A so it is able to deliver more than 2A DC current to
the load depending on the application conditions.
The output voltage can be set from 1.235V to 22V.The
high current level is also achieved utilize an SO8
package with exposed pad frame. The type of package
allowsto re-duce the Rth (j-amb) down to approximately
45°C/W.
An internal oscillator fixes the switching frequency at
500KHz.
Having a minimum input voltage of 4.8V only, it is
particularly suitable for 5V bus, available in all computer
related applications.
Pulse by pulse current limit with the internal frequency
modulation offers an effective constant current short.
circuit protection.
Pin Description
OUT 1
SYNC 2
INH 3
COMP 4
8 VCC
7 GND
6 VREF
5 FB
SOP-8-P (Top View)
= Thermal Pad
(connected to GND plane for better heat
dissipation)
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.5 - Aug., 2005
1
www.anpec.com.tw
www.DataSheet.in
1 page  
APW1173
Electrical Characteristics (Cont.)
The * denotes the specifications that apply over TA = -40 ~ 85oC. Typical values are at TA = 25oC.
VCC = 12V unless otherwise specified.
Symbol
Parameter
Test condition
APW1173
Unit
Min Typ Max
Reference Section
VREF VREF Output Voltage
IREF = 0mA
3.234 3.3 3.366 V
IREF
22V
=
0mA
to
5mA,VCC
=
4.4A
to
*
3.2
3.3 3.399 V
Line Regulation
IREF = 0mA,VCC = 4.4A to 22V
5 10 mV
Load Regulation
IREF = 0mA to 5mA
8 15 mV
Short Circuit Current
10 18 30 mA
Other
Thermal Limiting Protection
160 °C
Hysteresis
Over-Voltage Protection
Threshold Voltage
VCOMP = 0.8V
30 °C
* 120 125 130 %
Typical Application Circuit
VOUT = 3.3V
L
22uH
COUT
100uF
D1
1N5819
VREF = 3.3V
RC1
4.3K
1 OUT VCC
2 SYNC GND
3 INH VREF
4 COMP FB
D2
1N4148 APW1173
8
7
6
5
CC1
2.2nF
CC2
220pF
R1
C1 137K
1uF
Soft Start
Circuit
RF2 RF1
3.3K 5.6K
CIN VIN
22uF 4.8V to 22V
Copyright © ANPEC Electronics Corp.
Rev. A.5 - Aug., 2005
www.DataSheet.in
5
www.anpec.com.tw
5 Page 
APW1173
Operating waveforms (Cont.)
3. Current Limit :
- VIN = 12V,VOUT = 3.3V
- CIN = 22µF, COUT = 220µF, L = 15 µH
4. Load Transient :
- VIN = 12V,VOUT = 3.3V
- CIN = 22µF, COUT = 220µF, L = 15 µH
IOUT
IOUT
V OUT
COMP
V OUT
Ch1 : VOUT,2V/div
Ch2 : COMP,2V/div
Ch3 : IOUT,2A/div
Time : 2ms/div
Functional Description
Ch1 : VOUT,200mV/div,offset 3.3V
Ch2 : IOUT,1A/div,100mA-3A
Ch2 rising time : 4us
Ch2 falling time : 4us
Time : 10us/div
Power-On-Reset
A Power-On-Reset circuit monitors input voltages at
VCC pin to prevent wrong logic controls. The POR
function initiates immediately by the inductor current
with it’s limit after the supply voltage exceed firstly it’s
threshold voltage after powering on.
Output Voltage Regulation
An error amplifier working with a temperature-compen-
sated 1.235V reference. The error amplifier designed
with high bandwidth and DC gain provides very fast
transient response and less load regulation. It compares
the reference with the feedback voltage and amplifies
the difference in it’s output called error signal. The
error signal feeds into the input terminal of PWM
comparator and compared with internal saw tooth wave.
It generates a PWM control signal by the PWM
comparator. The PWM signal feeds into the logic
circuit and turns on or off the pass element. The Buck
type output stage regulates the correct output voltage
depends on the previous mechanism.
Current Limit
The APW1173 monitors the current flow through the
pass element and limits the maximum output current
to prevent damages during overload or short-circuit
conditions.
Over-Voltage Protection (OVP)
The over voltage protection is realized by using an
Copyright © ANPEC Electronics Corp.
Rev. A.5 - Aug., 2005
11
www.anpec.com.tw
www.DataSheet.in
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet APW1173.PDF ] | |
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