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PDF APW7165 Data sheet ( Hoja de datos )
| Número de pieza | APW7165 | |
| Descripción | 5V to 12V Synchronous Buck Controller | |
| Fabricantes | Anpec Electronics Coropration | |
| Logotipo |  |
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APW7165
5V to 12V Synchronous Buck Controller
Features
• Wide Operation Supply Voltage from 5V to 12V
• Power-On-Reset Monitoring on VCC
• Excellent ReferenceVoltage Regulations
- 0.8V Internal Reference
- ±1% Over Temperature Range
• Integrated Soft-Start
• Automatic PSM/PWM Modes
• Voltage Mode PWM Operation with 90% (Max.)
Duty Cycle
• Under-Voltage Protection
• Adjustable Over-Current Protection Threshold
- Sensing the RDS(ON)of Low-Side MOSFET
• Over-Voltage Protection
• Under-Voltage Protection
• Simple SOP-8 Package
• Lead Free and Green Devices Available
(RoHS Compliant)
Applications
• Graphic Cards
• DSL, Switch HUB
• Wireless Lan
• Notebook Computer
• Mother Board
• LCD Monitor/TV
Pin Configuration
BOOT 1
UGATE 2
GND 3
LGATE 4
SOP-8
(Top View)
8 PHASE
7 COMP
6 FB
5 VCC
General Description
The APW7165 is a voltage mode, fixed 300kHz-switching
frequency, and synchronous buck controller. The
APW7165 allows wide input voltage that is either a single
5~12V or two supply voltages for various applications. A
power-on-reset (POR) circuit monitors the VCC supply
voltage to prevent wrong logic controls. A built-in digital
soft-start circuit prevents the output voltages from over-
shoot as well as limits the input current. An internal 0.8V
temperature-compensated reference voltage with high
accuracy is designed to meet the requirement of low out-
put voltage applications. The AP W7165 provides excel-
lent output voltage regulations against load current
variation.
The controller’s over-current protection monitors the out-
put current by using the voltage drop across the R of
DS(ON)
low-side MOSFET, eliminating the need for a current sens-
ing resistor that features high efficiency and low cost.
The AP W7165 also integrates over-voltage protection
(OVP) and under-voltage protection circuit which moni-
tors the FB voltage to prevent the PWM output from over
and under voltage.
The APW7165 is available in a simple SOP-8 package.
Simplified Application Circuit
OFF
ON
VVCC
APW7165
5 VCC BOOT 1
7
UGATE
COMP
2
PHASE 8
6
FB
LGATE
GND
4
3
VIN
VOUT
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.3 - Jan., 2011
1
www.anpec.com.tw
http://www.Datasheet4U.com
1 page  
APW7165
Operating Waveforms
Refer to the typical application circuit. The test condition is VIN=12V, TA= 25oC unless otherwise specified.
Power On
Power Off
V IN
1
VOUT
2
VUGATE
3
CH1: VIN, 5V/Div
CH2: VOUT, 500mV/Div
CH3: VUGATE, 10V/Div
Time: 1ms/Div
1
2
3
CH1: VIN, 5V/Div
CH2: VOUT, 500mV/Div
CH3: VUGATE, 10V/Div
Time: 200ms/Div
VIN
VOUT
V
UGATE
Enable
VCOMP
1
VOUT
2
VP H A S E
3
CH1: VCOMP, 1V/Div
CH2: VOUT, 500mV/Div
CH3: VPHASE, 10V/Div
Time: 500µs/Div
Shutdown
RLOAD=10Ω
VCOMP
1
VOUT
2
VP H A S E
3
CH1: VCOMP, 1V/Div
CH2: VOUT, 500mV/Div
CH3: VPHASE, 10V/Div
Time: 1ms/Div
Copyright © ANPEC Electronics Corp.
Rev. A.3 - Jan., 2011
5
www.anpec.com.tw
5 Page 
APW7165
Function Description (Cont.)
Under-Voltage Protection
The under-voltage function monitors the voltage on FB
(VFB) by Under-Voltage (UV) comparator to protect the PWM
converter against short-circuit conditions. When the V FB
falls below the falling UVP threshold (50% V REF), a fault
signal is internally generated and the device turns off
high-side and low-side MOSFE Ts. The converter is shut-
down and the output is latched to be floating.
Over-Voltage Protection (OVP)
The over-voltage protection monitors the FB voltage to
prevent the output from over-voltage condition. When the
output voltage rises above 120% of the nominal output
voltage, the APW7165 turns off the high-side MOSFET
and turns on the low-side MOSFET until the output volt-
age falls below the falling OVP threshold, regulating the
output voltage around the OVP threshold.
Adaptive Shoot-Through Protection
The gate drivers incorporate an adaptive shoot-through
protection to prevent high-side and low-side MOSFE Ts
from conducting simultaneously and shorting the input
supply. This is accomplished by ensuring the falling gate
has turned off one MOSFET before the other is allowed to
rise.
During turn-off of the low-side MOSFE T, the LGATE volt-
age is monitored until it is below 1.5V threshold, at which
time the UGATE is released to rise after a constant delay.
During turn-off of the high-side OCSFE T, the UGATE-to-
PHASE voltage is also monitored until it is below 1.5V
threshold, at which time the LG ATE is released to rise
after a constant delay.
Shutdown and Enable
The APW7165 can be shut down or enabled by pulling
low the voltage on COMP. The COMP is a dual-function
pin. During normal operation, this pin represents the
output of the error amplifier. It is used to compensate the
regulation control loop in combination with the FB pin.
Pulling the COMP low (VDISABLE = 0.6V typical) places the
controller into shutdown mode which UGATE and LGATE
are pulled to PHASE and GND respectively.
When the pull-down device is released, the COMP volt-
age will start to rise.When the COMP voltage rises above
the V
threshold, the APW7165 will begin a new ini-
DISABLE
tialization and soft-start process.
Pulse Skipping Mode (PSM)
At light loads, the inductor current may reach zero or re-
verse on each pulse. The low-side MOSFET is turned off
by the current reversal comparator, IZCMP, to block the
negative inductor current. In this condition, the converter
enters discontinuous current mode operation.
At very light loads, the AP W7165 will automatically skip
pulses in pulse skipping mode operation to reduce
switching losses as well as maintain output regulation
for efficient applications.
Copyright © ANPEC Electronics Corp.
Rev. A.3 - Jan., 2011
11
www.anpec.com.tw
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet APW7165.PDF ] | |
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