|
|
PDF APW7073 Data sheet ( Hoja de datos )
| Número de pieza | APW7073 | |
| Descripción | Synchronous Buck PWM Controller | |
| Fabricantes | Anpec Electronics Coropration | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de APW7073 (archivo pdf) en la parte inferior de esta página. Total 19 Páginas | ||
|
No Preview Available !
APW7073
Synchronous Buck PWM Controller
Features
• Single 12V Power Supply Required
• 0.6V Reference with 1% Accuracy
• Shutdown and Soft-Start Function
• Programmable Frequency Range from 50 kHz to
1000kHz
• Voltage Mode PWM Control Design
• Up to 100% Duty Cycle
• Under-Voltage Protection (UVP)
• Over-Current Protection (OCP)
• SOP-14 Package
• Lead Free and Green Devices Available
(RoHS Compliant)
Typical Application Circuit
12V
RFS
APW7073
ROCSET
VIN
L VOUT
CSS
General Description
The APW7073 is a voltage mode, synchronous PWM
controller which drives dual N-channel MOSFETs. The
device integrates all of the control, monitoring and
protecting functions into a single package, provides
one controlled power output with under-voltage and
over-current protections.
The APW7073 provides excellent regulation for output
load variation. The internal 0.6V temperature-compensated
reference voltage is designed to meet the requirement
of low output voltage applications. The device includes a
200kHz free-running triangle-wave oscillator that is
adjustable from 50kHz to 1000kHz.
The APW7073 has been equipped with excellent protec-
tion functions: POR, OCP, and UVP. The Power-On-Re-
set (POR) circuit can monitor the VCC, EN, and OCSET
voltage to make sure the supply voltage exceeds their
threshold voltage while the controller is running. The
Over-Current Protection (OCP) monitors the output cur-
rent by using the voltage drop across the upper MOSFET’s
R . When the output current reaches the trip point, the
DS(ON)
controller will run the soft-start function until the fault
events are removed. The Under-Voltage Protection (UVP)
monitors the voltage at FB pin (V ) for short-circuit
FB
protection. When the V is less than 50% of V , the
FB REF
controller will shutdown the IC directly.
Applications
• Graphic Cards
Ordering and Marking Information
APW7073
Assembly Material
Handling Code
Temperature Range
Package Code
Package Code
K : SOP - 14
Operating Ambient Temperature Range
E : -20 to 70°C
Handling Code
TR : Tape & Reel
Assembly Material
L : Lead Free Device G : Halogen and Lead Free Device
APW7073 K :
APW7073
XXXXX
XXXXX - Date Code
Note : ANPEC lead-free products contain molding compounds/die attach materials and 100% matte tin plate termination finish;
which are fully compliant with RoHS. 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 defines “Green” to mean lead-free (RoHS compliant) and
halogen free (Br or Cl does not exceed 900ppm by weight in homogeneous material and total of Br and Cl does not exceed
1500ppm by weight).
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.6 - Oct., 2008
1
www.anpec.com.tw
1 page  
APW7073
Operating Waveforms
Power On
Vcc=12V, Vin=12V
VOUT=1.5V, L=1uH
1
2
3
CH1: VCC (5V/div)
CH2: VSS (2V/div)
CH3: VOUT (1V/div)
Time: 10ms/div
Power Off
Vcc=12V, Vin=12V
VOUT=1.5V, L=1uH
1
2
3
CH1: VCC (5V/div)
CH2: VSS (2V/div)
CH3: VOUT (1V/div)
Time: 2ms/div
EN (VEN=VCC)
Vcc=12V, Vin=12V
VOUT=1.5V, L=1uH
1
2
3
CH1: VEN (5V/div)
CH2: VSS (5V/div)
CH3: VOUT (1V/div)
Time: 10ms/div
Shutdown (VEN=VGND)
Vcc=12V, Vin=12V
VOUT=1.5V, L=1uH
1
2
3
CH1: VEN (5V/div)
CH2: VSS (5V/div)
CH3: VOUT (1V/div)
Time: 10ms/div
Copyright © ANPEC Electronics Corp.
Rev. A.6 - Oct., 2008
5
www.anpec.com.tw
5 Page 
APW7073
Function Description (Cont.)
Over-Current Protection (Cont.)
An over current condition will shut down the device and
discharge the CSS with a 30µA sink current and then
initiates the soft-start sequence. If the over current condi-
tion is not removed during the soft-start interval, the de-
vice will be shut down while the over current is detected
and the VSS still rises to 4V to complete its cycle. The
soft-start function will be cycled until the over current condi-
tion is removed. Both over-current protections have the
same behavior while an over current condition is
detected.
Under-Voltage Protection
The FB pin is monitored during converter operation by
their own Under Voltage (UV) comparator. If the FB
voltage drops below 50% of the reference voltage (50%
of 0.6V = 0.3V), a fault signal is internally generated, and
the device turns off both high-side and low-side MOSFET
and the converter’s output is latched to be floating.
Switching Frequency
The APW7073 provides the oscillator switching frequency
adjustment. The device includes a 200kHz free-running
triangle wave oscillator. If operating in higher frequency
than 200kHz, connect a resistor from RT pin to the ground
to increase the switching frequency. Conversely, if oper-
ating in lower frequency than 200kHz, connect a resistor
from RT to the VCC to decrease the switching frequency.
Figure 2. shows how to select the resistor for the desired
frequency. Figure 3. shows more detail for the higher
frequencies and Figure 4 shows the lower frequency
detail.
Copyright © ANPEC Electronics Corp.
Rev. A.6 - Oct., 2008
11
1000
900
800
700
600
500
400
300
200
100
0
10
Frequency (kHz)
1000
Figure2. Oscillator Frequency vs. RT Resistance
1000
900
800
700
600
500
400
300
200
100
0
200 300 400 500 600 700 800 900 1000
Frequency (kHz)
Figure3. Oscillator Frequency vs. RT Resistance
(High Frequency)
1000
900
800
700
600
500
400
300
200
50 70 90 110 130 150 170
Frequency (kHz)
Figure4. Oscillator Frequency vs. RT Resistance
(Low Frequency)
www.anpec.com.tw
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet APW7073.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| APW7070 | Synchronous Step-Down Converter |  ANPEC |
| APW7070A | Synchronous Step-Down Converter | ANPEC |
| APW7071 | White LED DC/DC Step-Up Converter | Anpec Electronics Coropration |
| APW7073 | Synchronous Buck PWM Controller | Anpec Electronics Coropration |
| 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 |