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PDF AP8007 Data sheet ( Hoja de datos )
| Número de pieza | AP8007 | |
| Descripción | AC-DC PWM CONTROLLER | |
| Fabricantes | AiT Semiconductor | |
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AiT Semiconductor Inc.
www.ait-ic.com
AP8007
AC-DC PWM CONTROLLER
PRIMARY SWITCHING REGULATORS
DESCRIPTION
The AP8007 is a high performance AC-DC off‐line
controller for low power battery charger and adapter
applications with Universal‐input. It uses Pulse
Frequency and Width Modulation (PFWM) method
to build discontinuous conduction mode (DCM)
flyback power supplies.
The AP8007 utilizes primary‐side sensing and
regulation technology to provide accurate constant
voltage, constant current (CV/CC) regulation without
requiring an opto‐coupler and secondary control
circuitry. It also eliminates the need of external loop
compensation circuitry while maintaining stability.
The AP8007 achieves excellent regulation and high
average efficiency, yet meets the requirement for
standby power less than 150mW.
The AP8007 ensures safe operation with complete
protection against all fault conditions. Built‐in
protection circuitry is provided for output short
circuit, output over‐voltage, line under‐voltage, VDD
over voltage, feedback open and short, and over
temperature conditions.
Integrated line and primary inductance
compensation circuitry, the AP8007 provides
accurate constant current operation despite wide
variations in line voltage and primary inductance. It
has the built‐in cable voltage drop compensation
function.
The AP8007 is available in SOT-25 package.
FEATURES
Primary Side Regulation Technology for
Eliminating Opto‐coupler and Secondary CV/CC
Control Circuitry
Best‐in‐Class Constant Voltage, Constant
Current Accuracy
Built‐in Soft‐Start Circuit
Integrated Line and Primary Inductance
Compensation
Integrated Output Cable Voltage Drop
Compensation
Line Under‐Voltage, Output Over‐Voltage,
Output Short‐Circuit and Over‐Temperature
Protection
Minimum External Components
Low EMI
Available in SOT-25 Package
APPLICATION
Chargers for Cell Phones, PDAs, MP3, Portable
Media Players, DSCs, and Other Portable
Devices and Appliances
RCC Adapter Replacements
Linear Adapter Replacements
Standby and Auxiliary Supplies
ORDERING INFORMATION
TYPICAL APPLICATION
Package Type
Part Number
SOT-25
E5 AP8007E5R
AP8007E5VR
Note
R: Tape & Reel
V: Halogen free Package
AiT provides all RoHS products
Suffix “ V” means Halogen free Package
REV1.0
-JUL 2012 RELEASED -
Simplified Application Circuit
-1-
1 page  
AiT Semiconductor Inc.
www.ait-ic.com
BLOCK DIAGRAM
AP8007
AC-DC PWM CONTROLLER
PRIMARY SWITCHING REGULATORS
REV1.0
-JUL 2012 RELEASED -
-5-
5 Page 
AiT Semiconductor Inc.
www.ait-ic.com
AP8007
AC-DC PWM CONTROLLER
PRIMARY SWITCHING REGULATORS
Design Procedure
Fig. 1, Typical Application Circuit, shows a complete, optimized constant voltage/constant current charger
application. The application design procedure for using the AP8007 is simple. Based on the control IC
selected, three components determine the output constant voltage and constant current settings: the
transformer T1 and resistors R5 and R6. Refer to Table 2 for selection values for these three key components
for different typical design cases. The Typical Application Circuit in Fig. 1 lists component values of other
devices in a complete charger application.
Design Notes
1. Feedback resistors R1 and R2 must meet the ±1% maximum tolerance to have good VOUT regulation.
2. The value of the feedback resistor can be chosen slightly different from the table according to the actual
system efficiencies in different systems.
3. The value of VOUT capacitor should be chosen differently to meet the VOUT ripple for different systems.
4. C8 must be added to guarantee good CC accuracy.
Part Number
AP8007
OUTPUT
VO(V) IO(mA)
5.0 750
Table 2 Component Selection
TRANSFORMER
LP±7%
NP NA NS
(mH)
130 10. 32 2.3
RESISTOR NETWORK
R1±1%
R2±1%
(kΩ) (kΩ)
9.06 33
PCB Layout Consideration
Good PCB layout is critical to have optimal performance. Decoupling capacitor (C4) and feedback resistor
(R1/R2) should be placed close to VDD and FB pins respectively. There are two main power path loops. One is
formed by C1/C2, primary winding, NPN transistor and the AP8007. The other is the secondary winding,
rectifier D8 and output capacitors (C5). Keep these loop areas as small as possible. Connect high current
ground returns, the input capacitor ground lead, and the AP8007 GND pin to a single point (star ground
configuration).
REV1.0
-JUL 2012 RELEASED -
- 11 -
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet AP8007.PDF ] | |
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