BCD AP4305KTR-G1 Constant voltage and constant current controller Datasheet

Data Sheet
CONSTANT VOLTAGE AND CONSTANT CURRENT CONTROLLER
General Description
Features
The AP4305 is a highly integrated solution for a constant voltage/constant current mode SMPS application.
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The AP4305 contains one 1.21V voltage reference
with ± 0.5% accuracy, one current sensing circuit and
two operational amplifiers. Combining the voltage reference with one operational amplifier makes AP4305
an ideal voltage controller for use in adapters and battery chargers. The other low voltage reference combined with the other operational amplifier makes it an
ideal current limiter for output low side current sensing.
AP4305
Constant Voltage and Constant Current Control
Precision Internal Voltage Reference
Few External Components
Easy Compensation
Low Supply Current: 0.5mA
Operating Temperature Range: -40 to 105oC
Applications
·
·
Adapters
Battery Chargers
The AP4305 is available in SOT-23-6 package.
SOT-23-6
Figure 1. Package Type of AP4305
May 2010 Rev. 2. 0
BCD Semiconductor Manufacturing Limited
1
Data Sheet
CONSTANT VOLTAGE AND CONSTANT CURRENT CONTROLLER
AP4305
Pin Configuration
K Package
(SOT-23-6)
Pin 1 Dot by Marking
VCTRL
1
6
VCC
GND
2
5
VSENSE
VOUT
3
4
ICTRL
Figure 2. Pin Configuration of AP4305 (Top View)
Pin Description
Pin Number
Pin Name
Function
1
VCTRL
2
GND
Ground
3
VOUT
Output pin. Sinking current only
4
ICTRL
Input pin of the current control loop
5
VSENSE
Input pin of the current control loop
6
VCC
Input pin of the voltage control loop
Power supply
May 2010 Rev. 2. 0
BCD Semiconductor Manufacturing Limited
2
Data Sheet
CONSTANT VOLTAGE AND CONSTANT CURRENT CONTROLLER
AP4305
Functional Block Diagram
VCC
6
1.210V
3
VOUT
1
VCTRL
2
GND
200mV
5
4
ICTRL
VSENSE
Figure 3. Functional Block Diagram of AP4305
Ordering Information
AP4305
-
Circuit Type
G1: Green
Package
K: SOT-23-6
TR: Tape and Reel
Package
Temperature Range
SOT-23-6
-40 to 105oC
Part Number
AP4305KTR-G1
Marking ID
G2B
Packing Type
Tape & Reel
BCD Semiconductor's products, as designated with "G1" suffix in the part number, are RoHS compliant and Green.
May 2010 Rev. 2. 0
BCD Semiconductor Manufacturing Limited
3
Data Sheet
CONSTANT VOLTAGE AND CONSTANT CURRENT CONTROLLER
AP4305
Absolute Maximum Ratings (Note 1)
Parameter
Symbol
Value
Unit
Power Supply Voltage
VCC
20
V
Input Voltage
VIN
-0.3 to VCC
V
Junction Temperature
TJ
150
Storage Temperature
TSTG
-65 to 150
oC
TLEAD
260
oC
θJC
92
Lead Temperature (Soldering, 5sec)
Package Thermal Resistance (Junction to Case)
o
o
C
C/W
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
Power Supply Voltage
Operating Temperature Range
Symbol
Min
Max
Unit
VCC
2.5
18
V
TA
-40
105
oC
May 2010 Rev. 2. 0
BCD Semiconductor Manufacturing Limited
4
Data Sheet
CONSTANT VOLTAGE AND CONSTANT CURRENT CONTROLLER
AP4305
Electrical Characteristics
(VCC=5V, TA=25oC, unless otherwise specified.)
Parameter
Symbol
Conditions
Min
Typ
Max
TA=25oC
0.5
1
-40oC<TA<105oC
0.6
Unit
TOTAL CURRENT CONSUMPTION
Total Supply Current
Not Including the Output Sinking
Current
ICC
mA
VOLTAGE CONTROL LOOP
Transconduction Gain (VCTRL).
Sink Current Only
Gmv
Voltage Control Loop Reference
VREF
Input Bias Current (VCTRL)
1
TA=25oC
mA/mV
2.5
-40oC<TA< 105oC
IIBV
3.5
TA=25oC
1.204
-40oC<TA< 105oC
1.186
1.21
1.216
V
1.234
TA=25oC
50
-40oC<TA< 105oC
100
nA
CURRENT CONTROL LOOP
Transconduction Gain (ICTRL).
Sink Current Only
Current Control Loop Reference
Current Out of Pin ICTRL at 200mV
Gmi
VSENSE
IIBI
TA=25oC
1.5
7
IOUT=2.5mA, TA=25oC
198
200
IOUT=2.5mA, -40oC<TA< 105oC
192
mA/mV
202
208
TA=25oC
25
-40oC<TA< 105oC
50
TA=25oC
200
TA=25oC
27
-40oC<TA< 105oC
35
mV
µA
OUTPUT STAGE
Low Output Voltage at 10mA
Sinking Current
VOL
Output Short Circuit Current.
Output to VCC, Sink Current Only
IOS
mV
50
mA
May 2010 Rev. 2. 0
BCD Semiconductor Manufacturing Limited
5
Data Sheet
CONSTANT VOLTAGE AND CONSTANT CURRENT CONTROLLER
AP4305
Typical Performance Characteristics
1.220
203
1.215
VCC=12V
VCC=5V
VCC=2.5V
202
VSENSE (mV)
VREF (V)
1.210
1.205
201
200
1.200
199
1.195
1.190
-40
-20
0
20
40
60
80
100
198
-40
120
-20
0
o
Ambient Temperature ( C)
60
80
100
120
Figure 5. VSENSE vs. Ambient Temperature
45
100
VCC=12V
VCC=5V
VCC=2.5V
80
VCC=12V
VCC=5V
VCC=2.5V
40
35
IIBI (µA)
60
IIBV (nA)
40
o
Figure 4. VREF vs. Ambient Temperature
40
30
20
25
0
20
-20
-40
20
Ambient Temperature ( C)
-20
0
20
40
60
80
100
15
-40
120
-20
0
20
40
60
80
100
120
o
o
Ambient Temperature ( C)
Ambient Temperature ( C)
Figure 6. IIBV vs. Ambient Temperature
Figure 7. IIBI vs. Ambient Temperature
May 2010 Rev. 2. 0
BCD Semiconductor Manufacturing Limited
6
Data Sheet
CONSTANT VOLTAGE AND CONSTANT CURRENT CONTROLLER
AP4305
Typical Performance Characteristics (Continued)
1.6
1.4
VCC=12V
VCC=5V
VCC=2.5V
50
1.2
Supply Current (mA)
Output Short Circuit Current (mA)
60
40
30
20
VCC=12V
VCC=5V
VCC=2.5V
10
0
-40
-20
0
20
40
60
80
100
1.0
0.8
0.6
0.4
0.2
0.0
-40
120
o
-20
0
20
40
60
80
100
120
o
Ambient Temperature ( C)
Ambient Temperature ( C)
Figure 8. Output Short Circuit Current vs.
Figure 9. Supply Current vs. Ambient Temperature
Ambient Temperature
May 2010 Rev. 2. 0
BCD Semiconductor Manufacturing Limited
7
Data Sheet
CONSTANT VOLTAGE AND CONSTANT CURRENT CONTROLLER
AP4305
Typical Application
VOUT+
To primary
AP4305
VCC
R4
1.210V
R3
VOUT
+
R2
IL
C1
+
VCTRL
Load
C3
GND
R5
VSENSE
ICTRL
R1
R6
500
VOUT-
Rss
VOUT = VREF ×
R1 + R 2
R1
(V)
VSENSE
RSS
(A)
CurrentLimit =
Figure 10. Typical Application 1 of AP4305
May 2010 Rev. 2. 0
BCD Semiconductor Manufacturing Limited
8
Data Sheet
CONSTANT VOLTAGE AND CONSTANT CURRENT CONTROLLER
AP4305
Typical Application (Continued)
VOUT+
To primary
AP4305
VCC
R4
1.210V
R3
VOUT
+
R2
IL
C1
+
VCTRL
Load
C3
GND
ICTRL
R5
VSENSE
R1
R6
500
VOUTRss
VOUT = [VREF + ( I L × RSS )] ×
R1 + R 2
− ( I L × RSS )
R1
CurrentLimit =
VSENSE
RSS
(V)
(A)
Figure 11. Typical Application 2 of AP4305
May 2010 Rev. 2. 0
BCD Semiconductor Manufacturing Limited
9
Data Sheet
CONSTANT VOLTAGE AND CONSTANT CURRENT CONTROLLER
AP4305
Typical Application (Continued)
VOUT+
To primary
AP4305
VCC
R4
1.210V
VOUT
+
R3
R2
IL
C1
+
VCTRL
Load
C3
GND
ICTRL
R5
VSENSE
R1
R6
500
VOUTRss
VOUT = VREF ×
R1 + R 2
− ( I L × RSS )
R1
CurrentLimit =
(V)
VSENSE × VREF
(VSENSE + VREF )× RSS
(A)
Figure 12. Typical Application 3 of AP4305
May 2010 Rev. 2. 0
BCD Semiconductor Manufacturing Limited
10
Data Sheet
CONSTANT VOLTAGE AND CONSTANT CURRENT CONTROLLER
AP4305
Mechanical Dimensions
SOT-23-6
Unit: mm(inch)
0°
2.820(0.111)
8°
3.020(0.119)
0.300(0.012)
0.400(0.016)
5
0.300(0.012)
0.600(0.024)
4
1.500(0.059)
1.700(0.067)
2.650(0.104)
2.950(0.116)
6
0.200(0.008)
Pin 1 Dot by Marking
1
2
3
0.700(0.028)REF
0.950(0.037)TYP
0.000(0.000)
0.150(0.006)
1.800(0.071)
2.000(0.079)
0.100(0.004)
0.200(0.008)
0.900(0.035) 1.450(0.057)
MAX
1.300(0.051)
May 2010 Rev. 2. 0
BCD Semiconductor Manufacturing Limited
11
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