AP3203 [BCDSEMI]
380kHz, 3A Asynchronous DC - DC Buck Converter; 380kHz ， 3A异步直流 - 直流降压转换器
| 型号： | AP3203 |
| 厂家： | 
BCD SEMICONDUCTOR MANUFACTURING LIMITED |
| 描述： | 380kHz, 3A Asynchronous DC - DC Buck Converter |
| 文件： | 总11页 (文件大小：542K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Preliminary Datasheet
380kHz, 3A Asynchronous DC - DC Buck Converter AP3203
Features
General Description
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Input Voltage Range: 4.75V to 18V
The AP3203 is a 380kHz fixed frequency, current
mode, PWM buck (step-down) DC-DC converter,
capable of driving a 3A load with high efficiency,
excellent line and load regulation. The device
integrates N-channel power MOSFET switch with
low on-resistance. The current mode control provides
fast transient response and cycle-by-cycle current
limit.
Fixed 380kHz Frequency
High Efficiency: up to 93%
Output Current: 3A
Current Mode Control
Built-in Over Current Protection
Built-in Thermal Shutdown Function
Built-in UVLO Function
Built-in Over Voltage Protection
Programmable Soft-start
A standard series of inductors are available from
several different manufacturers optimized for use
with the AP3203. This feature greatly simplifies the
design of switch-mode power supplies.
Applications
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Portable DVD
DPF
LCD-TV
STB
This IC is available in PSOP-8 package.
PSOP-8
Figure 1. Package Type of AP3203
Mar. 2011 Rev. 1. 0
BCD Semiconductor Manufacturing Limited
1
Preliminary Datasheet
380kHz, 3A Asynchronous DC - DC Buck Converter AP3203
Pin Configuration
MP Package
(PSOP-8)
Figure 2. Pin Configuration of AP3203 (Top View)
Pin Description
Pin Number Pin Name
Function
Bootstrap pin. A bootstrap capacitor is connected between the BS pin
and SW pin. The voltage across the bootstrap capacitor drives the
internal high-side NMOS switch
Supply input pin. A capacitor should be connected between the IN pin
and GND pin to keep the DC input voltage constant
Power switch output pin. This pin is connected to the inductor and
bootstrap capacitor
1
2
BS
IN
3
4
SW
GND
Ground pin
Feedback pin. This pin is connected to an external resistor divider to
program the system output voltage. When the FB pin voltage exceeds
20% of the nominal regulation value of 1.222V, the over voltage
protection is triggered. When the FB pin voltage is below 0.6V, the
oscillator frequency is lowered to realize short circuit protection
Compensation pin. This pin is the output of the transconductance
error amplifier and the input to the current comparator. It is used to
compensate the control loop. Connect a series RC network from this
pin to GND. In some cases, an additional capacitor from this pin to
GND pin is required
5
6
FB
COMP
Control input pin. Forcing this pin above 1.5V or set this pin floating
enables the IC. Forcing this pin below 0.5V shuts down the IC. When
the IC is in shutdown mode, all functions are disabled to decrease the
supply current below 1µA
Soft-start control input. SS controls the soft-start period. Connect a
capacitor from SS to GND to set the soft-start period. A 0.1µF
capacitor sets the soft-start period to 10ms. To disable the soft-start
feature, leave SS disconnected
7
8
EN
SS
Mar. 2011 Rev. 1. 0
BCD Semiconductor Manufacturing Limited
2
Preliminary Datasheet
380kHz, 3A Asynchronous DC - DC Buck Converter
AP3203
Functional Block Diagram
2
IN
VA
Current
Sense
Amplifier
Internal Bias
and Regulator
VB
5V
SLOP COMP
Internal
Pull High
Oscillator
1
90k/380k
BS
M1
0.12
CLK
Q
Q
S
R
3
4
SW
Shutdown
PWM
Comparator
Comparator
7
M2
10
EN
0.4/1.5V
1.3V
GND
VB
0.6
Error
Amplifier
Short
6 A
1.222
Protection
Comparator
6
5
8
FB
COMP
SS
Figure 3. Functional Block Diagram of AP3203
Ordering Information
AP3203
-
Circuit Type
G1: Green
Package
MP: PSOP-8
TR: Tape & Reel
Blank: Tube
Temperature
Package
Range
Part Number
Marking ID
Packing Type
AP3203MP-G1
3203MP-G1
3203MP-G1
Tube
PSOP-8
-40 to 85ºC
AP3203MPTR-G1
Tape & Reel
BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS compliant
and green.
Mar. 2011 Rev. 1. 0
BCD Semiconductor Manufacturing Limited
3
Preliminary Datasheet
380kHz, 3A Asynchronous DC - DC Buck Converter
Absolute Maximum Ratings (Note 1)
AP3203
Parameter
Symbol
VIN
Value
-0.3 to 20
-0.3 to VIN
21
Unit
V
IN Pin Voltage
EN Pin Voltage
VEN
V
SW Pin Voltage
VSW
VBS
V
BS Pin Voltage
-0.3 to VSW+6
-0.3 to 6
-0.3 to 6
-0.3 to 6
105
V
FB Pin Voltage
VFB
V
COMP Pin Voltage
SS Pin Voltage
VCOMP
VSS
V
V
Thermal Resistance
Operating Junction Temperature
Storage Temperature
Lead Temperature (Soldering, 10sec)
ESD (Machine Model)
ESD (Human Body Model)
ºC/W
ºC
ºC
ºC
V
θJA
TJ
150
TSTG
TLEAD
-65 to 150
260
200
2000
V
Note 1: Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to
the device. These are stress ratings only, and functional operation of the device at these or any other conditions
beyond those indicated under “Recommended Operating Conditions” is not implied. Exposure to “Absolute
Maximum Ratings” for extended periods may affect device reliability.
Recommended Operating Conditions
Parameter
Symbol
VIN
Min
4.75
3
Max
Unit
V
Input Voltage
18
Maximum Output Current
Operating Ambient Temperature
IOUT (Max)
TA
A
-40
85
ºC
Mar. 2011 Rev. 1. 0
BCD Semiconductor Manufacturing Limited
4
Preliminary Datasheet
380kHz, 3A Asynchronous DC - DC Buck Converter AP3203
Electrical Characteristics
VIN=VEN=12V, VOUT=3.3V, TA=25oC, unless otherwise specified. And those in boldface type apply over
the full operating temperature rang (TA=-40ºC to +85ºC).
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
Input Voltage
VIN
4.75
18
V
VEN=2V,
VFB=1.35V
Quiescent Current
IQ
1.0
1.5
mA
Shutdown Supply Current
Feedback Voltage
ISHDN
VFB
VEN=0V
1
10
µA
V
1.185
1.222
1.258
Feedback Over Voltage
Threshold
VFBOV
1.48
0.6
V
Feedback SCP Voltage Threshold
Feedback Bias Current
VFB_SCP
IFB
RDSONH
RDSONL
V
µA
Ω
VFB= 1V
ISW=0.5A
-0.1
0.1
10
0.12
10
Upper Switch On-resistance
Lower Switch On-resistance
ISW=0.05A
Ω
High-side Switch Leakage
Current
VIN=18V, VEN=0V
ILEAKH
ILIMH
ILIML
0.1
5.2
µA
A
VSW=0V
High-side Switch Current Limit
4
From
Source
Drain
to
Low-side Switch Current Limit
0.15
A
VENH
VENL
IEN_PH
VUVLO
VHYS
fOSC1
1.5
V
V
EN Pin Threshold
0.5
EN Pull-up Current
VEN=0V
1.0
3.85
0.3
µA
V
Input UVLO Threshold
Input UVLO Hysteresis
Oscillator Frequency
VIN Rising
3.55
4.15
V
380
kHz
Short Circuit Oscillator
Frequency
fOSC2
80
90
kHz
Maximum Duty Cycle
DMAX
DMIN
AEA
VFB=1.0V
%
%
Minimum Duty Cycle
VFB=1.35V
0
Error Amplifier Voltage Gain (Note 3)
Error Amplifier Transconductance
400
950
V/V
µA/V
GEA
700
1200
COMP
Transconductance
to
Current
Sense
GCS
TOTSD
THYS
5.4
160
30
A/V
ºC
Thermal Shutdown (Note 3)
Thermal Shutdown Hysteresis (Note
3)
ºC
C4=0.1µF,
Soft-start Time (Note 3)
Soft-start Current
tSS
ISS
10
6
ms
I
OUT=500mA
µA
Mar. 2011 Rev. 1. 0
BCD Semiconductor Manufacturing Limited
5
Preliminary Datasheet
380kHz, 3A Asynchronous DC - DC Buck Converter AP3203
VSW 1 −VSW 2
ISW 1 − ISW 2
Note 2: RDSON
=
Note 3: Not tested, guaranteed by design.
Typical Performance Characteristics
TA=25ºC, VIN=12V, VOUT=3.3V, unless otherwise noted.
100
90
80
70
60
50
40
30
1.40
1.35
1.30
1.25
1.20
1.15
1.10
1.05
1.00
0.95
0.90
0.85
0.80
0.75
0.70
VIN=12V
VIN=5V
20
10
0
0.0
0.5
1.0
1.5
2.0
2.5
3.0
-60
-40
-20
0
20
40
60
80
100
120
140
Temperature (oC)
Output Current (A)
Figure 4. Efficiency vs. Output Current
Figure 5. Quiescent Current vs. Temperature
3.50
1.30
3.45
3.40
3.35
3.30
3.25
3.20
3.15
3.10
3.05
3.00
1.28
1.26
1.24
1.22
1.20
1.18
1.16
1.14
1.12
1.10
0.0
0.5
1.0
1.5
2.0
2.5
3.0
-60
-40
-20
0
20
40
60
80
100
120
140
Output Current (A)
Temperature (oC)
Figure 6. Output Voltage vs. Output Current
Figure 7. Feedback Voltage vs. Temperature
Mar. 2011 Rev. 1. 0
BCD Semiconductor Manufacturing Limited
6
Preliminary Datasheet
380kHz, 3A Asynchronous DC - DC Buck Converter AP3203
Typical Performance Characteristics (Continued)
TA=25ºC, VIN=12V, VOUT=3.3V, unless otherwise noted.
170
160
150
140
130
120
110
100
90
18
16
14
12
10
8
80
70
60
6
-60
-40
-20
0
20
40
60
80
100
120
140
-40
-20
0
20
40
60
80
100
120
140
Temperature (oC)
Temperature (oC)
Figure 8. RDSONH vs. Temperature
Figure 9. RDSONL vs. Temperature
IL
1A/div
IL
1A/div
VOUT(AC)
20mV/div
VOUT(AC)
200mV
VSW
5V/div
Time 400µs/div
Time 2µs/div
Figure 10. Output Ripple
Figure 11. Load Transient
(VIN=12V,VOUT=3.3V, IOUT=3A)
(VIN=12V, VOUT=3.3V, IOUT=2A to 3A)
Mar. 2011 Rev. 1. 0
BCD Semiconductor Manufacturing Limited
7
Preliminary Datasheet
380kHz, 3A Asynchronous DC - DC Buck Converter AP3203
Typical Performance Characteristics (Continued)
TA=25ºC, VIN=12V, VOUT=3.3V, unless otherwise noted.
VEN
2V/div
VEN
2V/div
VOUT
1V/div
VOUT
1V/div
IL
2A/div
IL
2A/div
VSW
5V/div
VSW
5V/div
Time 10ms/div
Time 10ms/div
Figure 12. Enable Turn Off
Figure 13. Enable Turn On
(VIN=12V,VOUT=3.3V, IOUT=3A, with Resister load)
(VIN=12V,VOUT=3.3V, IOUT=3A, with Resistance Load)
VOUT
2V/div
VOUT
2V/div
IL
2A/div
IL
2A/div
VSW
VSW
5V/div
5V/div
Time 200µs/div
Time 400µs/div
Figure 14. Short Circuit Protection
(VIN=12V, VOUT=3.3V, IOUT=3A)
Figure 15. Short Circuit Recovery
(VIN=12V, VOUT=3.3V, IOUT=3A)
Mar. 2011 Rev. 1. 0
BCD Semiconductor Manufacturing Limited
8
Preliminary Datasheet
380kHz, 3A Asynchronous DC - DC Buck Converter AP3203
Typical Application
Figure 8. Typical Application of AP3203
Mar. 2011 Rev. 1. 0
BCD Semiconductor Manufacturing Limited
9
Preliminary Datasheet
380kHz, 3A Asynchronous DC - DC Buck Converter
AP3203
Mechanical Dimensions
PSOP-8
Unit: mm(inch)
Mar. 2011 Rev. 1. 0
BCD Semiconductor Manufacturing Limited
10
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