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PDF APW8727L Data sheet ( Hoja de datos )
| Número de pieza | APW8727L | |
| Descripción | Synchronous single PWM Controller | |
| Fabricantes | ANPEC | |
| Logotipo |  |
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APW8727/L
Synchronous single PWM Controller with Multiform supply Voltage
Features
General Description
• Adjustable Output Voltage from +0.8V to +5.0V
The APW8727 is a single-phase, constant on-time, syn-
- 0.8V Reference Voltage
chronous PW M controller, which drives N-channel
- +0.6% Accuracy
MOSFETs. The APW8727 steps down high voltage to
• Operates from An Input Battery Voltage Range of generate low-voltage chipset, RAM supplies in notebook
+4V to +25V
computers or motherboard applications.
• Multiform Purpose Input Voltage Collocation
- -VCC=5V / VIN=8~19V For NB application
- VCC=5~12V / VIN=5~12V For table PC application
•
Power-On-Reset Monitoring on V pin
CC
• Excellent line and load transient responses
• Ultrasonic Operation Eliminated Audio Noise
• PFM mode for increased light load efficiency
• 300kHz Constant PWM Switching Frequency
• Integrated MOSFET Drivers
The APW8727 provides excellent transient response and
accurate DC voltage output in either PFM or PWM Mode.
In Pulse Frequency Mode (PFM), the APW8727 provides
very high efficiency over light to heavy loads with loading-
modulated switching frequencies. In PWM Mode, the con-
verter works nearly at constant frequency for low-noise
requirements. The unique ultrasonic mode maintains the
switching frequency above 37kHz, which eliminates noise
in audio application.
The APW8727 is equipped with accurate positive current
• Integrated Bootstrap Forward P-CH MOSFET
limit, output under-voltage, and output over-voltage
• Integrated Soft-Start Function
• Power Good Monitoring
• 70% Under-Voltage Protection
• 125% Over-Voltage Protection
• Adjustable Current-limit protection
- Using Sense Low-Side MOSFET’s RDS(ON)
• Over-Temperature Protection
• TDFN-10 3x3 package
protections, perfect for multiform applications. The Power-
On-Reset function monitors the voltage on VCC to pre-
vent wrong operation during power-on. The APW8727 has
an internal 2ms digital soft start that ramps up the output
voltage with programmable slew rate to reduce the start-
up current. The enable function can let user easy to apply
APW8727.
The APW8727 is available in 10pin TDFN 3x3 package
respectively.
• Lead Free and Green Devices Available
(RoHS Compliant)
Simplified Application Circuit
Applications
• Notebook
• Table PC
• Hand-Held Portable
• AIO PC
• Wide input DC/DC Regulators
4.5~13.2V
VCC
UGATE
APW8727
POK
PHASE
EN
LGATE/
OCSET
4~25V
VIN
Q1
L
VOUT
Q2
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.1 - Apr., 2013
1
www.anpec.com.tw
Free Datasheet http://www.datasheet4u.com/
1 page  
APW8727/L
Electrical Characteristics (Cont.)
These specifications apply for T = -40oC to +85oC, unless otherwise stated. All typical specifications T = +25oC, V =
A A CC
12V
Symbal
Parameter
VCC POR THRESHOLD
VVCC_THR
Rising VCC POR Threshold
Voltage
VCC POR Hysteresis
CONTROL INPUTS
EN Threshold
EN Leakage
POWER-OK INDICATOR
VPOK
POK Threshold
IPOK POK Leakage Current
POK Sink Current
POK Enable Delay Time
CURRENT SENSE
IOCSET
TCIOCSET
IOCSET OCP Threshold
IOCSET Temperature
Coefficient
Test Condition
Shutdown
Enable
EN=5V
POK in from Lower (POK Goes
High)
POK out from normal falling (POK
Goes Low)
POK out from normal rising (POK
Goes Low)
VPOK=5V
VPOK=0.5V
VOUT from 0% to POK High
IOCSET Sourcing
On The Basis of 25°C
Min.
APW8727
Typ. Max.
Unit
4.25
-
4.35
300
4.45
-
V
mV
- - 0.85
V
1.3 - -
- 0.1 1.0 µA
87 90 93 %
65 70 75 %
120 125 130 %
- 0.1 1 µA
5 15 - mA
- 2.5 - ms
9.5 10 10.5 µA
2780
ppm/ oC
VROCSET
Maximum Current Limit
Threshold
ROCSET open
- 640 - mV
Zero Crossing Comparator
Offset
PROTECTION
VUV UVP Threshold
UVP Debounce Time
UVP Enable Delay
VOVR
OVP Rising Threshold
OVP Propagation Delay
TOTR
OTP Rising Threshold (Note
4)
OTP Hysteresis (Note 4)
Note 4: Guaranteed by design.
VGND-PHASE Voltage
VOUT from 0% to UVP enable
VFB rising, LG fully turn on
VFB Rising
-3 0 3 mV
65 70 75 %
- 30 - µs
- 2.5 - ms
120 125 130 %
- 2 - µs
- 150 - oC
- 25 - oC
Copyright © ANPEC Electronics Corp.
Rev. A.1 - Apr., 2013
5
www.anpec.com.tw
Free Datasheet http://www.datasheet4u.com/
5 Page 
APW8727/L
Block Diagram
POK
BOOT
PHASE
VREF x 125 %
VSENSE/FB
VREF x 70 %
125 % VREF
OV
BOOT Voltage
Sense Circuit
BOOT OK Signal
To
Sample and Hold
POR
POR
VIN OK Signal
To
Sample and Hold
Sense Low -Side
Current Limit
VIN Voltage
Sense
Circuit
VROCSET
70% VREF
FB
Fault
Latch
Logic
UV
Thermal
Shutdown
Error
Comparator
On-Time
Generator
VCC
VCC
VREF
POR
Digital Soft Start
Sample
and Hold
10µA
PHASE
V CC
EN
VROCSET
To LGATE
BOOT
UGATE
PHASE
LGATE
GND
Copyright © ANPEC Electronics Corp.
Rev. A.1 - Apr., 2013
11
www.anpec.com.tw
Free Datasheet http://www.datasheet4u.com
11 Page | ||
| Páginas | Total 23 Páginas | |
| PDF Descargar | [ Datasheet APW8727L.PDF ] | |
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