Diodes AP2008SG-13 Pwm buck controller Datasheet

AP2008
PWM BUCK CONTROLLER
General Description
Features
•
•
•
•
•
•
•
•
•
•
PWM Buck Control Circuitry
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)
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.
Applications
•
•
•
•
Backlight inverter
LCD Monitor
XDROM, XDSL Product
DC/DC converters in computers, etc.
Ordering Information
AP2008 X X X
Package
S: SOP-8L
Device
(Note 2)
AP2008S
Lead-Free
L : Lead Free
G : Green
Package
Packaging
Code
S
SOP-8L
Packing
-U : Tube
-13 : Taping
Tube or Bulk
Part Number
Quantity
Suffix
100
-U
13” Tape and Reel
Part Number
Quantity
Suffix
2500/Tape & Reel
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
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DECEMBER 2006
© Diodes Incorporated
-13
AP2008
PWM BUCK CONTROLLER
Pin Descriptions
Pin Assignments
( Top View )
OUT
1
VCC
COMP
FB
2
Name
.
3
8
7
AP2008
6
4
5
GND
CT
SS
SCP
OUT
PWM Output
VCC
Supply Voltage
COMP
FB
SOP
Description
SCP
Feedback Loop Compensation
Voltage Feedback
Short Circuit Protection
SS
Soft-Start.
CT
Timing Capacitor
GND
Ground
Block Diagram
VCC
CT
SS
10K-300KHz / CT value
0.77V
Bandgap
Reference
2.5V
Internal use
Oscillator
UVLO
VCC
Iss
PWM Amplifier
FB
+
+
-
OUT
Error Amplifier
COMP
1.5V
0.7V
+
+
SCP
AP2008 Rev. 2
-
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GND
DECEMBER 2006
© Diodes Incorporated
AP2008
PWM BUCK CONTROLLER
Absolute Maximum Ratings
Symbol
Rating
Unit
Supply voltage
22
V
VI
Amplifier input voltage
20
V
VO
Collector output voltage
VCC-1.0V
V
Source current
200
mA
ISINK
Sink current
200
mA
TOP
Operating temperature range
VCC
ISOURCE
TST
Parameter
Storage temperature range
-20 to +85
o
-65 to +150
o
C
C
Recommended Operating Conditions
Symbol
Min.
Max.
Unit
Supply voltage
3.6
20
V
VI
Amplifier input voltage
1.05
1.45
V
VO
Collector output voltage
Vcc-1.5
V
IFB
Current into feedback terminal
45
µA
RF
Feedback resistor
100
CT
Timing capacitor
100
6800
pF
FOSC
Oscillator frequency
10
300
KHz
TOP
Operating free-air temperature
-20
85
ºC
VCC
AP2008 Rev. 2
Parameter
3 of 8
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DECEMBER 2006
© Diodes Incorporated
AP2008
PWM BUCK CONTROLLER
Electrical Characteristics (T =25ºC, V
A
Reference (REF)
Symbol
Parameter
Comp connect to FB
VREF
Output voltage change with
temperature
Under voltage lockout (UVLO)
Symbol
Parameter
VUT
Upper threshold voltage (VCC)
VLWT
Lower threshold voltage (VCC)
VHT
Hysteresis (VCC)
Short-circuit protection (SCP) control
Symbol
Parameter
VIT
Input threshold voltage
VSTB
Standby voltage
VLT
Latched input voltage
ISCP
Input (source) current
Comparator threshold voltage
VCT
(COMP)
Oscillator (OSC)
Symbol
Parameter
FOSC
Frequency
Standard deviation of frequency
∆FOSC
Frequency change with voltage
Error-amplifier
Symbol
Parameter
VIO
Input offset voltage
IIO
Input offset current
IIB
Input bias current
Common-mode input voltage
VCM
range
Open-loop voltage
AV
amplification
GBW
Unity-gain bandwidth
CMRR
Common-mode rejection ratio
VOH
Max. output voltage
VOL
Min. output voltage
IOI
Output (sink) current (COMP)
Output (source) current
IOO
(COMP)
AP2008 Rev. 2
CC
=6V, f=200 Khz)
Conditions
Min.
0.755
Typ.
0.770
-0.1
-0.2
Max.
0.785
±1
±1
Unit
V
%
%
Min.
Typ.
2.9
2.4
500
Max.
Unit
V
V
mV
Min.
0.60
100
Typ.
0.67
130
50
-15
Max.
0.75
160
100
-20
Unit
V
mV
mV
µA
TA = -20ºC ~ 25ºC
TA = 25ºC ~ 85ºC
Conditions
IO(REF) = 0.1mA
TA = 25ºC
Conditions
TA = 25ºC
No pull up
No pull up
VI = 0.7V, TA = 25ºC
-10
1.5
Conditions
CT =270 pF
CT =270 pF
VCC=3.6V ~ 20V
Min.
Conditions
VO (FB)=0.77V
VO (FB)=0.77V
VO (FB)=0.77V
Min.
VCC=3.6V ~ 20V
1.05
RF=200 kΩ
Typ.
200
10
1
Typ.
160
70
V
Max.
Unit
KHz
%
Max.
±6
±100
500
Unit
mV
nA
nA
1.45
V
80
dB
1.5
80
VID = -0.1V, VO = 0.77V
0.5
1.6
MHz
dB
V
V
mA
VID = 0.1V, VO = 0.77V
-45
-70
µA
60
Vref-0.1
1
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AP2008
PWM BUCK CONTROLLER
Electrical Characteristics (Continued) (T =25ºC, V
A
Output section
Symbol
ILEAK
IDRV
VSAT
Parameter
VT100
Total device
Symbol
ICCA
Soft Start
Symbol
=6V, f=200 Khz)
Conditions
Min.
Typ.
Max.
Unit
10
µA
Leakage current
VO = 20V
Sink current
VIN= 12V
200
mA
Source current
VIN= 12V
200
mA
Output saturation voltage
IO = 10 mA
1.0
VO = 6V
120
ISC
Short-circuit output current
PWM comparator
Symbol
Parameter
VT0
CC
Input threshold voltage at f =
10 KHz (COMP)
Parameter
Conditions
CT=6800pF
Maximum duty cycle
Conditions
Average supply current
Min.
Conditions
V
mA
Typ.
Max.
Unit
0.6
0.7
V
1.2
1.3
Min.
Typ.
Max.
Unit
6
10
mA
Typ.
Max.
Unit
CT = 270pF
Parameter
1.5
Min.
V
VSS
Soft-start Voltage
2.3
V
ISS
Constant Charge Current
20
µA
Typical Application Circuit
R3 30K
Vcc = 12V
C2
10nF
(Optional)
Q1
P mos
1 OUT GND 8
2 VCC
CT 7
3 COMP SS 6
FB
SCP 5
4
5A
C1
470uF
L1
10uH
R1
1K
Output
1V/5A
C4
50nF
(Optional)
C3
470uF
R2
4K
C4 270pF
C5 50nF
C6 220nF
Step-Down DC/DC converter
AP2008 Rev. 2
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AP2008
PWM BUCK CONTROLLER
Typical Characteristics
AVERAGE SUPPLY CURRENT
vs.
POWER-SUPPLY VOLTAGE
0.785
0.78
0.775
0.77
0.765
0.76
0.755
5
Icc-Average
Supply Current
(mA)
VrefReference
Output
Voltage (V)
REFERENCE OUTPUT VOLTAGE
vs.
POWER-SUPPLY VOLTAGE
4
6
8
10
12
14
16
18
4
3
2
1
0
0
20
AVERAGE SUPPLY CURRENT
vs.
AMBIENT TEMPERATURE
VCT (V)
ICC - Average
Supply Current
(mA)
6
5
4
3
2
-25
0
25
50
75
0
100
tscp-SCP Time-out
Period (ms)
fosc - Frequency
(KHz)
300
250
200
150
100
50
0
600
1100 1600 2100 2600 3100 3600 4100 4600 5100 5600 6100 6600
20
VCT(min)
VCT(max)
100
200
300
SCP TIME-OUT PERIOD
vs.
SCP CAPACITANCE
35
30
25
20
15
10
5
0
45
90 135 180 225 270 315 360 405 450 495
Cscp - SCP Capacitance (nF)
CT-Timing Capacitor (pF)
AP2008 Rev. 2
16
Frequency (KHz)
OSCILLATOR FREQUENCY
vs.
TIMING CAPACITANCE
100
12
1.6
1.4
1.2
1
0.8
0.6
0.4
0.2
0
TA - Ambient Temperature (℃)
350
8
VCT vs. FREQUENCY
7
-50
4
Vcc - Power-Supply Voltgae (V)
Vcc-Power Supply Voltage (V)
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AP2008
PWM BUCK CONTROLLER
Typical Characteristics (Continued)
30
SOFT-START TIME (Ts)
vs.
SOFT-START CAPACITOR (Css)
Ts (mS)
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
Part Number
Logo
L : Lead Free
G : Green
AP2008
YY WW X X
1
4
Internal code
Xth week: 01~52
Year: "01" =2001
"02" =2002
~
AP2008 Rev. 2
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AP2008
PWM BUCK CONTROLLER
Package Information ( unit in mm )
0.08/0.25
0.254
5.79/6.20
3.70/4.10
SOP-8L
Gauge Plane
Seating Plane
0.38/1.27
Detail "A"
7°~9°
0.3/0.5
1.27typ
45°
0.20typ
1.75max.
1.30/1.50
0.35max.
7°~9°
Detail "A"
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
agree to hold Diodes Incorporated and all the companies whose products are represented on our website, harmless against all damages.
LIFE SUPPORT
Diodes Incorporated products are not authorized for use as critical components in life support devices or systems without the expressed written approval of the
President of Diodes Incorporated.
AP2008 Rev. 2
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© Diodes Incorporated
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