AP2008SA [DIODES]
Switching Regulator/Controller, Voltage-mode, 300kHz Switching Freq-Max, BIPolar, PDSO8,;
| 型号： | AP2008SA |
| 厂家： | 
DIODES INCORPORATED |
| 描述： | Switching Regulator/Controller, Voltage-mode, 300kHz Switching Freq-Max, BIPolar, PDSO8, 光电二极管 |
| 文件： | 总8页 (文件大小：174K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
AP2008
PWM Buck Controller
Features
General Description
- 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
included an on-chip 0.77V reference output, an
error amplifier, an adjusted oscillator, a soft-start,
UVLO, SCP circuitry, and a push-pull output circuit.
Switching frequency can be 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 PDIP and SOP packages
Applications
- Backlight inverter
- LCD Monitor
- XDROM, XDSL Product
- DC/DC converters in computers, etc.
Pin Assignment
Pin Descriptions
( Top View )
Name
Description
Timing Capacitor
Voltage Feedback
Soft-Start.
Feedback Loop Compensation
PWM Output
CT
FB
SS
COMP
OUT
GND
VCC
SCP
OUT
1
2
3
4
8
7
6
5
GND
CT
SS
VCC
COMP
FB
SCP
PDIP/SOP
Ground
Supply Voltage
Short Circuit Protection
Ordering Information
AP2008 X
X
X
Package
N: PDIP-8L Blank : Normal
S: SOP-8L
Lead Free
Packing
Blank : Tube
L : Lead Free Package
A : Taping
This datasheet 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. 1.0 Oct 11, 2004
1/8
AP2008
PWM Buck Controller
Block Diagram
VCC
SS CT
10K-300KHz / CT value
Oscillator
2.5V
Internal use
0.77V
Bandgap
Reference
UVLO
VCC
Iss
PWM Amplifier
FB
+
+
OUT
-
Error Amplifier
COMP
-
0.7V
-
1.5V
+
+
SCP
GND
Absolute Maximum Ratings
Symbol
VCC
Parameter
Rating
22
Unit
V
Supply voltage
VI
VO
ISOURCE
ISINK
TOP
Amplifier input voltage
Collector output voltage
Source current
Sink current
Operating temperature range
Storage temperature range
20
VCC-1.0V
200
200
-20 to +85
V
V
mA
mA
oC
TST
TLEAD
-65 to +150
260
oC
oC
Lead temperature 1.6 mm(1/16 inch) from case for 10 seconds
Anachip Corp.
www.anachip.com.tw
Rev. 1.0 Oct 11, 2004
2/8
AP2008
PWM Buck Controller
Recommended Operating Conditions
Symbol
VCC
VI
VO
IFB
RF
CT
FOSC
TOP
Parameter
Min.
3.6
1.05
Max.
20
1.45
Vcc-1.5
45
Unit
V
V
Supply voltage
Amplifier input voltage
Collector output voltage
Current into feedback terminal
Feedback resistor
Timing capacitor
Oscillator frequency
V
µA
kΩ
pF
KHz
ºC
100
100
10
6800
300
85
Operating free-air temperature
-20
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
)
)
2.9
2.4
500
V
V
mV
IO(REF) = 0.1mA
TA = 25ºC
VLWT
VHT
Lower threshold voltage (VCC
Hysteresis (VCC
)
Short-circuit protection (SCP) control
Symbol
VIT
VSTB
VLT
Parameter
Input threshold voltage
Standby voltage
Conditions
TA = 25ºC
No pull up
No pull up
VI = 0.7V, TA = 25ºC
Min.
0.60
100
Typ. Max. Unit
0.67
130
50
0.75
160
100
-20
V
mV
mV
µA
Latched input voltage
Input (source) current
Comparator threshold voltage
(COMP)
ISCP
-10
-15
VCT
1.5
V
Oscillator (OSC)
Symbol
Parameter
Conditions
CT =270 pF
CT =270 pF
VCC=3.6V ~ 20V
Min.
Typ. Max. Unit
FOSC
Frequency
200
10
1
KHz
Standard deviation of frequency
Frequency change with voltage
∆FOSC
%
Anachip Corp.
www.anachip.com.tw
Rev. 1.0 Oct 11, 2004
3/8
AP2008
PWM Buck Controller
Electrical Characteristics (Continued) (TA=25ºC, VCC=6V, f=200 KHz)
Error-amplifier
Symbol
Parameter
Input offset voltage
Input offset current
Conditions
VO (FB)=0.77V
VO (FB)=0.77V
VO (FB)=0.77V
Min.
Typ.
160
80
Max.
±6
±100
500
Unit
mV
nA
VIO
IIO
IIB
Input bias current
Common-mode input voltage
range
nA
VCM
VCC=3.6V ~ 20V
1.05
70
1.45
V
Open-loop voltage
amplification
Unity-gain bandwidth
AV
RF=200 kΩ
dB
GBW
CMRR
VOH
VOL
IOI
1.5
80
MHz
dB
V
V
mA
Common-mode rejection ratio
Max. output voltage
Min. output voltage
Output (sink) current (COMP) VID = -0.1V, VO = 0.77V
Output (source) current
VID = 0.1V, VO = 0.77V
(COMP)
60
Vref-0.1
1
0.5
-45
1.6
-70
IOO
µA
Output section
Symbol
Parameter
Leakage current
Sink current
Source current
Output saturation voltage
Short-circuit output current
Conditions
VO = 20V
VIN= 12V
VIN= 12V
IO = 10 mA
VO = 6V
Min.
Min.
Typ.
Max.
10
Unit
µA
mA
mA
V
ILEAK
200
200
1.0
IDRV
VSAT
ISC
1.5
120
mA
PWM comparator
Symbol
Parameter
Conditions
CT=6800pF
Maximum duty cycle
Typ.
0.6
1.3
Max.
0.7
Unit
V
V
VT0
Input threshold voltage at f =
10 KHz (COMP)
VT100
Total device
Symbol
1.2
Parameter
Conditions
Min.
Typ.
Max.
Unit
ICCA
Soft Start
Symbol
Average supply current
CT = 270pF
6
10
mA
Parameter
Soft-start Voltage
Constant Charge Current
Conditions
Min.
Typ.
2.3
20
Max.
Unit
V
µA
VSS
ISS
Anachip Corp.
www.anachip.com.tw
Rev. 1.0 Oct 11, 2004
4/8
AP2008
PWM Buck Controller
Typical Application Circuit
R3 30K
Vcc = 12V
C1
C2
Q1
10nF
470uF
(Optional)
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
Typical Characteristics
REFERENCE OUTPUT VOLTAGE
v.s.
AVERAGE SUPPLY CURRENT
v.s.
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
v.s.
VCT v.s. FREQUENCY
AMBIENT TEMPERATRUE
1.6
1.4
1.2
1
0.8
0.6
0.4
0.2
0
7
6
5
4
3
2
0
100
200
300
-50
-25
0
25
50
75
100
Frequency (KHz)
TA - Ambient Temperatrure(℃)
Anachip Corp.
www.anachip.com.tw
Rev. 1.0 Oct 11, 2004
5/8
AP2008
PWM Buck Controller
Typical Characteristics (Continued)
SCP TIME-OUT PERIOD
OSCILLATOR FREQUENCY
v.s.
v.s.
SCP CAPACITANCE
TIMING CAPACITANCE
350
35
30
25
20
15
10
5
300
250
200
150
100
50
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)
SOFT-START TIME (Ts)
v.s.
SOFT-START CAPACITOR (Css)
30
25
20
15
10
5
0
25
50
75
100 125 150 175 200
Css (nF)
Marking Information
(Top View)
5
8
ID code
Logo
Blank: normal
AP2008
Part No.
L: Lead Free Package
Xth week: 01~52
Year: "01" =2001
"02" =2002
YY WW X X
1
4
PDIP/SOP
Anachip Corp.
www.anachip.com.tw
Rev. 1.0 Oct 11, 2004
6/8
AP2008
PWM Buck Controller
Package Information
(1) PDIP-8L (Plastic Dual-in-line Package )
D
E-PIN O0.118 inch
E
(4X)
15
PIN #1 INDENT O0.025 DEEP 0.006-0.008 inch
C
7
(4X)
eB
B
B1
e
S
B2
Dimensions in millimeters
Dimensions in inches
Symbol
Min.
-
0.38
3.1
0.36
1.4
0.81
0.20
9.02
7.62
6.15
-
2.92
8.38
0.71
Nom.
-
Max.
5.33
-
Min.
Nom.
-
Max.
A
A1
A2
B
B1
B2
C
D
E
E1
e
L
-
0.210
-
-
0.015
0.122
0.014
0.055
0.032
0.008
0.355
0.300
0.242
-
-
3.30
0.46
1.52
0.99
0.25
9.27
7.94
6.35
2.54
3.3
3.5
0.130
0.018
0.060
0.039
0.010
0.365
0.313
0.250
0.100
0.130
0.350
0.033
0.138
0.022
0.065
0.045
0.014
0.375
0.325
0.258
-
0.56
1.65
1.14
0.36
9.53
8.26
6.55
-
3.81
9.40
0.97
0.115
0.330
0.028
0.150
0.370
0.038
eB
S
8.89
0.84
Anachip Corp.
www.anachip.com.tw
Rev. 1.0 Oct 11, 2004
7/8
AP2008
PWM Buck Controller
Package Information (Continued)
(2) SOP- 8L(JEDEC Small Outline Package)
L
VIEW "A"
D
0.015x45
VIEW "A"
7 (4X)
7 (4X)
e
B
y
Dimensions In Millimeters
Dimensions In Inches
Symbol
Min.
1.40
0.10
1.30
0.33
0.19
4.80
3.70
-
Nom.
1.60
-
Max.
1.75
0.25
1.50
0.51
0.25
5.30
4.10
-
6.20
1.27
0.10
8O
Min.
Nom.
0.063
-
Max.
A
A1
A2
B
C
D
E
e
H
L
0.055
0.040
0.051
0.013
0.0075
0.189
0.146
-
0.069
0.100
0.059
0.020
0.010
0.209
0.161
-
0.244
0.050
0.004
8O
1.45
0.41
0.20
5.05
3.90
1.27
5.99
0.71
-
0.057
0.016
0.008
0.199
0.154
0.050
0.236
0.028
-
5.79
0.38
-
0.228
0.015
-
y
θ
0O
-
0O
-
Anachip Corp.
www.anachip.com.tw
Rev. 1.0 Oct 11, 2004
8/8
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