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PDF ANP015 Data sheet ( Hoja de datos )
| Número de pieza | ANP015 | |
| Descripción | Application Note AP2011 High Efficiency Synchronous PWM Controller | |
| Fabricantes | Anachip | |
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Application Note
AP2011 High Efficiency Synchronous PWM Controller
Contents
1. AP2011 Specification
1.1 Features
1.2 General Description
1.3 Pin Assignments
1.4 Pin Descriptions
1.5 Block Diagram
1.6 Absolute Maximum Ratings
2. Hardware
2.1 Introduction
2.2 Description of the built-in function circuit
2.3 Schematic
2.4 Board of Material
2.5 Board Layout
3. Design Procedure
3.1 Introduction
3.2 Operating Specifications
3.3 Design Procedures
4. Design Example
4.1 Summary of Target Specifications
4.2 Calculating and Component Selections
4.3 Efficiency Calculation
ANP015
Preliminary
www.DataSheet4U.com
This application note contains new product information. Anachip Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of the
use of this product. No rights under any patent accompany the sale of the product.
Rev. A.0 Oct. 29, 2004
1/15
1 page  
Application Note
AP2011 High Efficiency Synchronous PWM Controller
ANP015
Preliminary
z Under Voltage Lock Out (UVLO)
The circuit shown in Figure 2 is a simple explanation of UVLO function. VCC voltage will make that two
resistors get a compared voltage with VREF. AP2011 is designed for UVLO voltage is 6.5V, and recovery
voltage is 6.8V (that 0.3V voltage is depend on the offset voltage of the comparator). If VCC voltage is lower
than 6.5V, the separate voltage of those two resistors is under 1.25V, than that comparator will send low level
signal to SS pin to shutdown AP2011. And if VCC is higher than 6.8V, that comparator will send high level
signal to SS and AP2011 will start to enter normal operation mode.
VCC
VREF
VREF
1.25V
+
-
SS/SHDN
Figure 2. Under Voltage Lock-Out circuit
z Soft-Start and Shutdown ( SS/ SHDN )
The circuit shown in Figure 3 is about soft-start and shutdown function. If outside system force SS pin
always under 0.2V, AP2011 will turn into shutdown mode and turn off the PWM. When SS pin higher than
0.2V, PWM will turn on to drive outside MOSFET, but now PWM duty is depend on the comparison of SS and
FB. According to SS pin raising curve, FB will follow this curve until SS reaches to VREF + 0.3V, and then
PWM duty will turn to depend on the comparison of VREF and FB.
VREF
FB
SS/SHDN
VCC
10uA
2uA
-
+
+
+- -
0.3V
+
-
0.2V
0.9V
-
+
PWM
Control
DRVP
DRVN
Anachip Corp.
www.anachip.com.tw
Figure 3. Soft-start and Shutdown circuit
5/15
Rev. A.0 Oct, 29, 2004
5 Page 
Application Note
AP2011 High Efficiency Synchronous PWM Controller
ANP015
Preliminary
3. Design Procedure
3.1 Introduction
The AP2011 integrated circuit is a synchronous PWM controller, it operates over a wide input
voltage range. Being low cost, it is a very popular choice of PWM controller. This section will describe
the AP2011 design procedure. The operation and the design of this application will also be discussed in
detail.
3.2 Operating Specifications
Specification
Input Voltage
Output Voltage
Operating Frequency
Output power
Min Typ
18 20
4.9 5
160 180
0 25
Table 1. Operating Specifications
Max Units
22 V
5.1 V
200 KHz
30 W
3.3 Design Procedures
This section describes the steps to design synchronous buck converter, and explains how to
construct basic power conversion circuits including the design of the control chip functions and the basic
loop.
z Synchronous buck converter
Example calculations accompany the design equations. Since this is a buck output system, this
example calculations apply to the converter with output power is 60W and input voltage set to 25V,
unless specified otherwise. The first quantity to be determined is the converter the duty cycle value.
Duty ratio D =
+V Vo DS(sat),N
– +V V VIN DS(sat),P DS(sat),N
=
Ton
Ts
, 0≦D≦1
Assuming the low-side N-channel MOSFET switch-on voltage VDS(sat),N = 0.1 V, the high-side
P-channel MOSFET switch on voltage VDS(sat),P = 0.1V and Vo = 5V. In this case the duty cycle for VIN =
20V is 0.255 for 5V/5A output system.
Anachip Corp.
www.anachip.com.tw
11/15
Rev. A.0 Oct, 29, 2004
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet ANP015.PDF ] | |
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