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PDF APW7065C Data sheet ( Hoja de datos )
| Número de pieza | APW7065C | |
| Descripción | Synchronous Buck PWM Controller | |
| Fabricantes | Anpec Electronics Coropration | |
| Logotipo |  |
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APW7065C
Synchronous Buck PWM Controller
Features
• Single 12V Power Supply Required
• Fast Transient Response
- 0~90% Duty Ratio
• 0.8V Reference with 1% Accuracy
• Shutdown Function by Controlling COMP
PinVoltage
• Internal Soft-Start (1.7ms) Function
• Voltage Mode PWM Control Design
• Under-Voltage Protection
• Over-Current Protection
- Sense Low Side MOSFET’s RDS(ON)
• 300kHz Fixed Switching Frequency
• SOP-8 Package
• Lead Free and Green Devices Available
(RoHS Compliant)
Simplified Application Circuit
12V
VIN
APW7065C
L VOUT
Pin Configuration
General Description
The APW7065C uses fixed 300kHz switching f requency,
voltage mode, synchronous PWM controller which drives
dual N-channel MOSFE Ts. The device integrates the
control, monitoring and protection functions into a
singl e package, provides one controlled power outp ut
with under-voltage and over-current protections.
The AP W7065C provides excellent regulation for
output load variation. The internal 0.8V temperature-com-
pensated reference voltage is designed to meet the re-
quirement of low output voltage applications. An built-in
digital soft-start with fixed soft-start interval prevents the
output voltage from overshoot as well as limiting the in-
put current.
The AP W70 65C with excellent protection functions:
POR, OCP and UVP. The Power-On-Reset (POR) cir-
cuit can monitor VCC supply voltage exceeds its thresh-
old voltage while the controller is running, and a built-in
digital soft-start provides output with controlled voltage
rise. The Over-Current Protection (OCP) monitors the
output current by using the voltage drop across the lower
MOSFET’s R ,DS(ON) comparing with internal VOCP (0.29V),
when the output current reaches the trip point, the IC
shuts off the converter and initiates a new soft-start
process. After two over-current events are counted,
the device turns off both high-side and low-side
MOSFE Ts and the converter's output is latched to be
floating. It requires a POR of VCC to restart. The Under-
Voltage Protection (UVP) monitors the voltage of FB pin
for short-circuit protection, when the V FB is less than
50% of V REF (0.4V) , the controller will shutdown the IC
directly.
BOOT 1
UGATE 2
GND 3
LGATE 4
8 PHASE
7 COMP
6 FB
5 VCC
SOP-8
(APW7065C)
Applications
• Graphics Card
• Mother Board
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.2 - Mar., 2008
1
www.anpec.com.tw
http://www.Datasheet4U.com
1 page  
APW7065C
Typical Operating Characteristics
Switching Frequency vs. Junction Temperature
310
305 VCC=12V
300
295
290
285
280
275
-40 -20 0 20 40 60 80 100 120
Junction Temperature (°C )
Reference Voltage vs. Junction Temperature
0.804
0.802
VCC=12V
0.8
0.798
0.796
0.794
0.792
-40 -20 0 20 40 60 80 100 120
Junction Temperature (°C )
Operating Waveforms
VCC=12V, V IN=12V
VOUT=1.2V, L=1µH
Power On
CH1
CH2
CH3
CH4
CH1: VCC (5V/div)
CH2: VOUT (1V/div)
CH3: VCOMP (1V/div)
CH4: VUGATE (20Vdiv)
Time: 10ms/div
Power Off
VCC=12V, VIN=12V
VOUT=1.2V, L=1µH
CH1
CH2
CH3
CH4
CH1: VCC (5V/div)
CH2: VOUT (1V/div)
CH3: VCOMP (1V/div)
CH4: VUGATE (20Vdiv)
Time: 10ms/div
Copyright © ANPEC Electronics Corp.
Rev. A.2 - Mar., 2008
5
www.anpec.com.tw
5 Page 
APW7065C
Function Description (Cont.)
Shutdown and Enable
Pulling the COMP voltage to GND by an open drain
transistor, as shown in Typical Application Circuit,
shutdowns the APW7065C PWM controller. In shut-
down mode, the UGATE and LGATE turn off and pull to
PHASE and GND respectively.
Under Voltage Protection
The FB pin is monitored during converter operation by
the internal Under Voltage (UV) comparator. If the FB volt-
age drops below 50% of the reference voltage (50% of
0.8V = 0.4V), 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.
Copyright © ANPEC Electronics Corp.
Rev. A.2 - Mar., 2008
11
www.anpec.com.tw
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet APW7065C.PDF ] | |
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