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AP2008SL-U [DIODES]

PWM BUCK CONTROLLER; PWM降压控制器
AP2008SL-U
型号： AP2008SL-U
厂家： DIODES INCORPORATED    DIODES INCORPORATED
描述：

PWM BUCK CONTROLLER
PWM降压控制器

稳压器 开关式稳压器或控制器 电源电路 开关式控制器 光电二极管
文件： 总8页 (文件大小：219K)
中文：  中文翻译
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AP2008  
PWM BUCK CONTROLLER  
General Description  
Features  
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•
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PWM Buck Control Circuitry  
The AP2008 integrates Pulse-Width-Modulation (PWM) control  
circuit into a single chip, mainly designs for power-supply  
regulator. All the functions include an on-chip 0.77V reference  
output, an error amplifier, an adjustable oscillator, a soft-start,  
UVLO, SCP circuitry, and a push-pull output circuit. Switching  
frequency is adjustable by trimming CT. During low VCC situation,  
the UVLO makes sure that the outputs are off until the internal  
circuit is operational normally.  
Operating voltage can be up to 20V  
Under voltage Lockout (UVLO) Protection  
Short Circuit Protection (SCP)  
Soft-start circuit  
Variable Oscillator Frequency -- 300Khz Max  
0.77V voltage reference Output  
8-pin SOP package  
Lead Free Finish/ RoHS Compliant for Lead Free and  
“Green” products (Note 1)  
•
SOP-8L: Available in “Green” Molding Compound (No  
Br, Sb)  
Applications  
•
•
•
•
Backlight inverter  
LCD Monitor  
XDROM, XDSL Product  
DC/DC converters in computers, etc.  
Ordering Information  
AP2008  
X X  
X
Package  
Packing  
Lead-Free  
S: SOP-8L  
-U : Tube  
-13 : Taping  
L : Lead Free  
G : Green  
Tube or Bulk  
13” Tape and Reel  
Device  
(Note 2)  
Package  
Code  
Packaging  
Part Number  
Suffix  
Part Number  
Quantity  
Quantity  
Suffix  
AP2008S  
S
SOP-8L  
100  
- U  
2500/Tape & Reel  
-13  
Note: 1. RoHS revision 13.2.2003. Glass and High Temperature Solder Exemptions Applied, see EU Directive Annex Notes 5 and 7.  
2. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at  
http://www.diodes.com/datasheets/ap02001.pdf.  
AP2008 Rev. 2  
1 of 8  
DECEMBER 2006  
www.diodes.com  
© Diodes Incorporated  
AP2008  
PWM BUCK CONTROLLER  
Pin Descriptions  
Pin Assignments  
( Top View )  
Name  
Description  
PWM Output  
.
OUT  
VCC  
COMP  
FB  
8
7
6
5
OUT  
1
2
3
4
GND  
CT  
Supply Voltage  
VCC  
COMP  
FB  
AP2008  
SOP  
SS  
Feedback Loop Compensation  
Voltage Feedback  
Short Circuit Protection  
Soft-Start.  
SCP  
SCP  
SS  
CT  
Timing Capacitor  
Ground  
GND  
Block Diagram  
VCC  
SS CT  
10K-300KHz / CT value  
2.5V  
Internal use  
0.77V  
Bandgap  
Reference  
Oscillator  
UVLO  
VCC  
Iss  
PWM Amplifier  
FB  
+
+
OUT  
-
Error Amplifier  
COMP  
-
0.7V  
-
1.5V  
+
+
SCP  
GND  
AP2008 Rev. 2  
2 of 8  
www.diodes.com  
DECEMBER 2006  
© Diodes Incorporated  
AP2008  
PWM BUCK CONTROLLER  
Absolute Maximum Ratings  
Symbol  
VCC  
Parameter  
Rating  
22  
Unit  
V
Supply voltage  
VI  
Amplifier input voltage  
Collector output voltage  
Source current  
20  
V
VO  
VCC-1.0V  
200  
V
ISOURCE  
ISINK  
TOP  
mA  
mA  
oC  
oC  
Sink current  
200  
Operating temperature range  
Storage temperature range  
-20 to +85  
-65 to +150  
TST  
Recommended Operating Conditions  
Symbol  
VCC  
VI  
Parameter  
Min.  
3.6  
Max.  
20  
Unit  
Supply voltage  
V
V
Amplifier input voltage  
Collector output voltage  
Current into feedback terminal  
Feedback resistor  
1.05  
1.45  
Vcc-1.5  
45  
VO  
V
IFB  
µA  
kΩ  
pF  
KHz  
ºC  
RF  
100  
100  
10  
CT  
Timing capacitor  
6800  
300  
85  
FOSC  
TOP  
Oscillator frequency  
Operating free-air temperature  
-20  
AP2008 Rev. 2  
3 of 8  
www.diodes.com  
DECEMBER 2006  
© Diodes Incorporated  
AP2008  
PWM BUCK CONTROLLER  
Electrical Characteristics (TA=25ºC, VCC=6V, f=200 Khz)  
Reference (REF)  
Symbol  
Parameter  
Comp connect to FB  
Conditions  
Min.  
Typ. Max. Unit  
0.755 0.770 0.785  
V
%
%
VREF  
TA = -20ºC ~ 25ºC  
TA = 25ºC ~ 85ºC  
-0.1  
-0.2  
±1  
±1  
Output voltage change with  
temperature  
Under voltage lockout (UVLO)  
Symbol  
VUT  
Parameter  
Conditions  
Min.  
Typ. Max. Unit  
Upper threshold voltage (VCC)  
Lower threshold voltage (VCC)  
Hysteresis (VCC)  
2.9  
2.4  
500  
V
V
I
O(REF) = 0.1mA  
TA = 25ºC  
VLWT  
VHT  
mV  
Short-circuit protection (SCP) control  
Symbol  
VIT  
Parameter  
Input threshold voltage  
Standby voltage  
Conditions  
Min.  
0.60  
100  
Typ. Max. Unit  
TA = 25ºC  
0.67  
130  
50  
0.75  
160  
100  
-20  
V
VSTB  
VLT  
No pull up  
mV  
mV  
µA  
Latched input voltage  
No pull up  
ISCP  
Input (source) current  
Comparator threshold voltage  
(COMP)  
VI = 0.7V, TA = 25ºC  
-10  
-15  
VCT  
1.5  
V
Oscillator (OSC)  
Symbol  
Parameter  
Conditions  
CT =270 pF  
CT =270 pF  
Min.  
Typ. Max. Unit  
FOSC  
Frequency  
200  
10  
1
KHz  
Standard deviation of frequency  
Frequency change with voltage  
∆FOSC  
%
VCC=3.6V ~ 20V  
Error-amplifier  
Symbol  
Parameter  
Input offset voltage  
Input offset current  
Input bias current  
Common-mode input voltage  
range  
Conditions  
VO (FB)=0.77V  
VO (FB)=0.77V  
VO (FB)=0.77V  
Min.  
Typ.  
Max.  
±6  
±100  
500  
Unit  
mV  
nA  
VIO  
IIO  
IIB  
160  
nA  
VCM  
AV  
VCC=3.6V ~ 20V  
1.05  
70  
1.45  
V
Open-loop voltage  
amplification  
RF=200 kΩ  
80  
dB  
GBW  
CMRR  
VOH  
Unity-gain bandwidth  
Common-mode rejection ratio  
Max. output voltage  
1.5  
80  
MHz  
dB  
V
60  
Vref-0.1  
VOL  
Min. output voltage  
1
V
IOI  
Output (sink) current (COMP) VID = -0.1V, VO = 0.77V  
Output (source) current  
VID = 0.1V, VO = 0.77V  
(COMP)  
0.5  
-45  
1.6  
-70  
mA  
IOO  
µA  
AP2008 Rev. 2  
4 of 8  
DECEMBER 2006  
www.diodes.com  
© Diodes Incorporated  
AP2008  
PWM BUCK CONTROLLER  
Electrical Characteristics (Continued) (TA=25ºC, VCC=6V, f=200 Khz)  
Output section  
Symbol  
Parameter  
Leakage current  
Conditions  
VO = 20V  
Min.  
Typ.  
Max.  
Unit  
µA  
ILEAK  
10  
Sink current  
VIN= 12V  
VIN= 12V  
IO = 10 mA  
VO = 6V  
200  
200  
1.0  
mA  
mA  
V
IDRV  
Source current  
VSAT  
Output saturation voltage  
Short-circuit output current  
1.5  
ISC  
120  
mA  
PWM comparator  
Symbol  
Parameter  
Conditions  
Min.  
Typ.  
0.6  
Max.  
Unit  
V
VT0  
CT=6800pF  
0.7  
Input threshold voltage at f =  
10 KHz (COMP)  
VT100  
Total device  
Symbol  
Maximum duty cycle  
1.2  
1.3  
V
Parameter  
Conditions  
Min.  
Typ.  
Max.  
Unit  
ICCA  
Soft Start  
Symbol  
Average supply current  
CT = 270pF  
6
10  
mA  
Parameter  
Soft-start Voltage  
Conditions  
Min.  
Typ.  
2.3  
20  
Max.  
Unit  
V
VSS  
ISS  
Constant Charge Current  
µA  
Typical Application Circuit  
R3 30K  
Vcc = 12V  
C2  
10nF  
(Optional)  
Q1  
C1  
470uF  
P mos  
L1  
Output  
10uH  
1V/5A  
C4  
50nF  
(Optional)  
5A  
R1  
1K  
C3  
470uF  
R2  
4K  
C4 270pF  
C5 50nF  
C6 220nF  
Step-Down DC/DC converter  
AP2008 Rev. 2  
5 of 8  
DECEMBER 2006  
www.diodes.com  
© Diodes Incorporated  
AP2008  
PWM BUCK CONTROLLER  
Typical Characteristics  
REFERENCE OUTPUT VOLTAGE  
AVERAGE SUPPLY CURRENT  
vs.  
vs.  
POWER-SUPPLY VOLTAGE  
POWER-SUPPLY VOLTAGE  
0.785  
5
4
3
2
1
0
0.78  
0.775  
0.77  
0.765  
0.76  
0.755  
0
4
8
12  
16  
20  
4
6
8
10 12 14 16 18 20  
Vcc - Power-Supply Voltgae (V)  
Vcc-Power Supply Voltage (V)  
VCT(min)  
VCT(max)  
AVERAGE SUPPLY CURRENT  
vs.  
VCT vs. FREQUENCY  
AMBIENT TEMPERATURE  
1.6  
1.4  
1.2  
1
7
6
5
4
3
2
0.8  
0.6  
0.4  
0.2  
0
0
100  
200  
300  
-50  
-25  
0
25  
50  
75  
100  
Frequency (KHz)  
TA - Ambient Temperature (℃)  
SCP TIME-OUT PERIOD  
vs.  
SCP CAPACITANCE  
OSCILLATOR FREQUENCY  
vs.  
TIMING CAPACITANCE  
350  
300  
250  
200  
150  
100  
50  
35  
30  
25  
20  
15  
10  
5
0
0
45 90 135 180 225 270 315 360 405 450 495  
100 600 1100 1600 2100 2600 3100 3600 4100 4600 5100 5600 6100 6600  
Cscp - SCP Capacitance (nF)  
CT-Timing Capacitor (pF)  
AP2008 Rev. 2  
6 of 8  
DECEMBER 2006  
www.diodes.com  
© Diodes Incorporated  
AP2008  
PWM BUCK CONTROLLER  
Typical Characteristics (Continued)  
SOFT-START TIME (Ts)  
vs.  
SOFT-START CAPACITOR (Css)  
30  
25  
20  
15  
10  
5
0
25  
50  
75  
100 125 150 175 200  
Css (nF)  
Marking Information  
(1) SOP-8L  
(Top view)  
5
8
Logo  
L : Lead Free  
G : Green  
AP2008  
Part Number  
WW  
YY  
XX  
Internal code  
Xth week: 01~52  
Year: "01" =2001  
"02" =2002  
4
1
AP2008 Rev. 2  
7 of 8  
www.diodes.com  
DECEMBER 2006  
© Diodes Incorporated  
AP2008  
PWM BUCK CONTROLLER  
Package Information ( unit in mm )  
SOP-8L  
Gauge Plane  
Seating Plane  
0.38/1.27  
Detail "A"  
7°~9°  
7°~9°  
0.35max.  
45°  
Detail "A"  
0.3/0.5  
1.27typ  
3.70/4.10  
4.80/5.30  
IMPORTANT NOTICE  
Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further  
notice to any product herein. Diodes Incorporated does not assume any liability arising out of the application or use of any product described herein; neither  
does it convey any license under its patent rights, nor the rights of others. The user of products in such applications shall assume all risks of such use and will  
agreeto hold DiodesIncorporatedand all the companieswhose productsare represented onour website, harmlessagainst all damages.  
LIFE SUPPORT  
Diodes Incorporated productsare notauthorizedfor use ascriticalcomponentsin lifesupportdevices or systemswithout theexpressed written approval ofthe  
PresidentofDiodesIncorporated.  
AP2008 Rev. 2  
8 of 8  
DECEMBER 2006  
www.diodes.com  
© Diodes Incorporated  

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