AIC2511 [AIC]
3A STEP-DOWN PWM CONVERTER; 3A降压PWM转换器
| 型号： | AIC2511 |
| 厂家： | 
ANALOG INTERGRATIONS CORPORATION |
| 描述： | 3A STEP-DOWN PWM CONVERTER |
| 文件： | 总13页 (文件大小：593K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
AIC2511
3A STEP-DOWN PWM CONVERTER
FEATURES
Operating Input Voltage From 4.5V to 24V
GENERAL DESCRIPTION
ꢀ
ꢀ
ꢁ
The AIC2511 series are step-down monolithic
3.3V, 5V, 12V and Adjustable Output Version
ꢁ
ꢁ
PWM converters for delivering 3A at fixed
voltages of 3.3V, 5.0V, 12V and using an
external divider to adjust output voltage from
1.25V to 24V with excellent line and load
regulation.
Adjustable Version Output Voltage Range,
1.25V to 24V ± 4% max Over Line and Load
Regulation
Available in TO-263-5, TO-220-5, TO-220B
and TO-252-5 Package
ꢁ
Switching frequency up to 150KHz is
achievable thus allowing smaller-sized filter
components. Internal current limit and thermal
shutdown circuits provide protection from
overloads. The internal precise reference
combined with voltage feedback loop provides
optimum output voltage accuracy and fast load
transient response.
Requires Only 4 External Components.
150KHz Fixed Constant Frequency
Low Power Standby Mode, IQ Typically 80µA
TTL Shutdown Capability.
ꢁ
ꢁ
ꢁ
ꢁ
ꢁ
Current Limit and Thermal Shutdown
Protection.
3A Guaranteed Output Load Current
ꢁ
APPLICATIONS
Fixed Voltage power supply for LCD Monitor
and LCD TV
ꢀ
ꢁ
On-Card Switching regulators
ꢁ
ꢁ
Simple High Efficiency Step-down regulator
TYPICAL APPLICATION CIRCUIT
ꢀ
AIC2511
V
V
IN
OUT
2
4
1
5
OUT
IN
L1
+
+
CF
C1
C2
D1
R1
ON/OFF
FB
GND
3
C1: electrolyte capacitor 470uF
C2: electrolyte capacitor 220uF
CF:refer to table1
D1: SK54
R2
R1 short, R2 and CF open for fixed version
L1:33uH
Analog Integrations Corporation 3A1, No.1 Li-Hsin Rd. I, Science Park, Hsinchu 300, Taiwan
TEL: 886-3-5772500 FAX: 886-3-5772510 www.analog.com.tw
DS-2511P-02 071607
1
AIC2511
ꢀORDERING INFORMATION
AIC2511- XXXXXXX
PIN CONFIGURATION
TO-263-5
ORDER NUMBER
AIC2511PM5
FRONT VIEW
1: IN
2. OUT
3. GND
4. FB
PACKING TYPE
TR: TAPE & REEL
TB: TUBE
AIC2511-33PM5
AIC2511-50PM5
AIC2511-12PM5
1 2 3 4
5
PACKAGE TYPE
M5: TO-263-5
T5 : TO-220-5
B5 : TO-220B
E5 : TO-252-5
5. ON/OFF
TO-220-5
FRONT VIEW
1: IN
2. OUT
3. GND
AIC2511PT5
AIC2511-33PT5
AIC2511-50PT5
AIC2511-12PT5
1
2 3 4 5
P: Lead Free Commercial
4. FB
5. ON/OFF
OUTPUT VOLTAGE
DEFAULT : Adj
33 : 3.3V
TO-220B
FRONT VIEW
1: IN
2. OUT
3. GND
50 : 5.0V
12 : 12.0V
AIC2511PB5
AIC2511-33PB5
AIC2511-50PB5
AIC2511-12PB5
1
2 3 4 5
4. FB
5. ON/OFF
AIC2511PE5
TO-252-5
1: IN
2. OUT
3. GND
4. FB
AIC2511-33PE5
AIC2511-50PE5
AIC2511-12PE5
1 2 3 4 5
5. ON/OFF
Example: AIC2511-50PM5TR
ꢂ 5.0V Output Version, in Lead Free TO-263-5 Package
& Taping & Reel Packing Type
AIC2511-33PB5TR
ꢂ 3.3V Output Version, in Lead Free TO-220B Package
& Taping & Reel Packing Type
2
AIC2511
ꢀABSOLUTE MAXIMUM RATINGS
Supply Voltage
24V
FB, ON/OFF Pin Input Voltage
-0.3V to 24V
Operating Temperature Range
Storage Temperature Range
Junction Temperature
-40°C ~ 85°C
–65°C ~ 150°C
125°C
Lead Temperature (Soldering 10sec.)
260°C
Thermal Resistance Junction to Case
TO-263-5, TO-220-5, TO-220B
3°C /W
TO-252-5
12.5°C /W
60°C /W
Thermal Resistance Junction to Ambient
(Assume no ambient airflow, no heatsink)
TO-263-5
TO-220-5, TO-220B
TO-252-5
50°C /W
100°C /W
Absolute Maximum Ratings are those values beyond which the life of a device may be impaired.
3
AIC2511
ꢀELECTRICAL CHARACTERISTICS (T =25°C, V =12V for the 3.3V, 5V and
A
IN
Adjustable version and VIN=24V for the 12V version.) (Note1)
PARAMETER
Input Voltage
TEST CONDITIONS
MIN.
TYP.
MAX.
UNIT
4.5
24
V
Fixed Output Voltage
AIC2511-ADJ (VIN > 4.5V)
AIC2511-33 (VIN > 4.75V)
AIC2511-50 (VIN > 7.0V)
AIC2511-12 (VIN > 15V)
1.193
3.168
4.800
11.52
1.267
3.432
5.200
12.48
1.4
V
V
V
V
Saturation Voltage
1.2
5
V
Output Voltage Regulation
Quiescent Current
4
%
mA
Internal switch off
10
Shutdown Quiescent Current
FB bias current
ON/OFF= 5V (OFF)
VFB=1.3
80
10
2
200
50
µA
nA
mA
V
Output leakage current
Logic Input High
Vout=-0.9
30
(Regulator OFF)
(Regulator ON)
2.0
Logic Input Low
0.6
180
5.5
V
Oscillator Frequency
Output Current Limit
Maximum Duty Cycle
Minimum Duty Cycle
Efficiency
130
3.6
150
KHz
A
100
%
0
%
Vo=5V, Io=3A
80
%
Note 1: Specifications are production tested at TA=25°C. Specifications over the -40°C to 85°C operating
temperature range are assured by design, characterization and correlation with Statistical Quality
Controls (SQC).
4
AIC2511
TYPICAL PERFORMANCE CHARACTERISTICS
ꢀ
85
90
80
75
70
65
60
55
50
45
40
35
30
25
20
85
VOUT=3.3V version
VOUT=5.0V version
80
75
70
65
60
55
50
45
40
35
30
25
Vin=5V
Vin=12V
Vin=12V
Vin=18V
Vin=24V
Vin=18V
Vin=24V
10
100
1000
10
100
1000
Load current (mA)
Load current (mA)
Fig.1 3.3V version efficiency
Fig.2 5V version efficiency
90
95
90
85
80
75
70
65
60
55
50
45
85
80
75
70
65
60
55
50
45
40
35
30
Vout=12V
VOUT=12.0V version
Vout=5.0V
Vout=3.3V
Vin=18V
Vin=24V
IOUT=3A
TO-263-5
4
8
12
16
20
24
10
100
1000
Load current (mA)
Input Voltage (V)
Fig.3 12V version efficiency
Fig.4 Case temperature vs. input voltage
200
6.8
6.4
6.0
5.6
5.2
4.8
4.4
4.0
3.6
3.2
2.8
190
180
170
160
150
140
130
120
110
100
-60
-40
-20
0
20
40
60
80
100
-60
-40
-20
0
20
40
60
80
100
TJ(oC)
Current Limit vs. Temperature
Fig.6 Current Limit vs. Temperature
Fig.5 Switching Frequency vs. Temperature
5
AIC2511
TYPICAL PERFORMANCE CHARACTERISTICS
(Continued)
ꢀ
1.6
1.6
1.5
1.4
1.3
1.5
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
-40oC
1.2
25oC
3A
1.1
100oC
1.0
0.9
0.8
1A
0.7
0.6
0.5
-60
-40
-20
0
20
40
60
80
100
120
140
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
TJ (oC)
Switch Current (A)
Fig.7 Dropout Voltage vs. Temperature
Fig.8 Switching Saturation Voltage vs. Switch Current
2.5
2.0
1.5
1.0
0.5
0.0
5.0
4.8
4.6
4.4
4.2
4.0
3.8
3.6
3.4
3.2
3.0
2.8
VFB=1.23V
ILOAD=120mA
OFF
ON
-60
-40
-20
0
20
40
60
80
100
120
140
-60
-40
-20
0
20
40
60
80
100
120
140
TJ (oC)
TJ (oC)
Fig.9 ON/OFF Threshold Voltage vs. Temperature
Fig.10 Minimum Operating Supply Voltage vs. Temperature
(ADJ only)
2.0
1.5
1.0
0.5
0.0
VIN=24V
-40oC<TJ<125oC
3A
IOUT
0.1A
VOUT
100mV/div
VIN=12V
VOUT=5V
0
5
10
15
20
25
ON/OFF Pin Voltage (Volt)
Fig.12 Load transient response
Fig.11 ON/ OFF Pin Current (sinking) vs. Temperature
6
AIC2511
TYPICAL PERFORMANCE CHARACTERISTICS
(Continued)
ꢀ
Fig.13 FB Pin Ripple(CCM)
Fig.14 FB Pin Ripple(DCM)
BLOCK DIAGRAM
ꢀ
SHDN
IN
1.23 V
2.6V Regulator
ON / OFF
Reference
FB
Current
Limit
COMP.
AMP.
COMP.
Compensation
Circuit
Latch
Driver
OUT
GND
150KHz
OSC
Thermal
Shutdown
7
AIC2511
ꢀPIN DESCRIPTIONS
PIN 1: IN
Supply voltage input for the IC
PIN 4: FB
Feedback input for fixed-output or
adjustable-output version. Connect
directly to output for fixed
operation version or to a resistor
divider for adjustable operation
versions.
switching regulator. A suitable input
bypass capacitor must be present
at this pin to minimize voltage
transients and to supply the
switching currents needed by the
regulator.
PIN 5:ON/ OFF Allows the switching regulator
circuit to be shutdown using logic
level signals thus dropping the
total input supply current to
approximately 80µA. Drive it high
to disable the reference, control
circuitry and internal switches.
Drive low or connect to GND for
normal operation.
PIN 2: OUT Internal switch. The voltage at this
pin switches between (VIN-VSAT
)
and approximately -0.5V, with a
duty cycle of approximately
VOUT/VIN.
PIN 3: GND Ground requires a short, low noise
connection to ensure good load
regulation.
APPLICATION INFORMATION
ꢀ
Thermal considerations
the temperature rise, which are affected by factors
such as sink size, heat produced from heat
components, and etc., may be different from those
in Fig.8 depending on the conditions of the
application. According to the equation 1, as the
power loss or ambient temperature is rising the
heat sink size must be increased to decrease the
The AIC2511 is available with TO-220-5, TO-
220B, TO-263-5 and TO-252-5 packages. The
TO-220-5 and TO-220B packages need a heat
sink in most conditions. The TO-263-5 and TO-
252-5 packages are designed to be soldered to
the copper on a printed circuit board. The printed
circuit board is the heat sink for TO-263-5 and
TO-252-5 packages and other heat components,
such as inductors and diodes. The size of the heat
sink depends on the power loss of AIC2511 and
the ambient temperature. The power loss of
AIC2511 is determined by input voltage, output
voltage and load current. The Fig.4 represents the
curve of the AIC2511 case temperature in
different conditions.
thermal resistance (
) so that the junction
Rθ jA
temperature does not over 125 C. An appropriate
increase of heat sink size may result in a normal-
ranged junction temperature.
Tj −TA
PD =
Rθ jA
As junction temperature rises to its temperature
protect point, the AIC2511 will stop working.
Output voltage drops to zero until the junction
temperature decreases to a normal range.
The curve shows the AIC2511 temperature rises
above ambient temperature for a 3A load with
different input and output voltage. The values of
8
AIC2511
APPLICATION INFORMATION (Continued)
ꢀ
Assume the input voltage is 12V, output voltage is
5V and maximum load current is 3A. The output
ripple must be smaller than 2% of output voltage
Components Selection
Inductor
The inductor selection depends on the operating
frequency of the AIC2511. The ripple current ∆IL
interrelates with inductor value. A lower inductor
value gets a higher ripple current. Besides, a
higher VIN or VOUT can also get the same result.
The inductor value can be calculated as the
following formula.
Inductor selection
⎛
⎞
VOUT
VIN
1
⎜
⎟
⎟
L =
VOUT 1−
⎜
⎝
(
f
)(∆IL )
⎠
1
5
⎛
⎝
⎞
⎟
=
×5× 1−
= 32.4uH
⎜
150k × 0.6
12
⎠
Here, the delta IL is 0.6A. So we choose 33uH
inductor.
⎛
⎞
VOUT
1
⎜
⎟
⎟
L =
VOUT 1−
⎜
⎝
(
f
)(∆IL
)
V
IN
⎠
Output capacitor selection
Users can define the acceptable ∆IL to gain a
⎛
⎞
1
suitable inductor value.
⎜
⎟
⎟
∆VOUT = ∆IL ESR +
< 100mV
⎜
8 fCOUT
⎝
⎠
Diode
We choice the capacitor value: ESR=0.12,
The diode current rating must be higher than 1.3
times maximum load current. Also, if the power
supply needs to resist a continuous output short,
the diode should have a current ration equal to the
maximum current limit of the AIC2511. The
reverse voltage rating of the diode should be
higher than 1.25 times input voltage and the diode
must be fast. The reverse recovery time of the
diode is short.
capacitance=220uF
⎛
⎞
1
⎜
⎟
⎟
⇒∆VOUT = ∆IL ESR+
= 74mV <100mV
⎜
⎝
8fCOUT
⎠
The full load is 3A and delta IL is 0.6A, so the
diode current rating must be higher than 3.6A.
CF Capacitor for adj version
As using the AIC2511 adj version, the CF
capacitor is required to provide additional stability.
In different condition, the CF capacitor must be
changed to make the circuit stable.
Capacitor
The selection of output capacitor depends on the
suitable ripple voltage. Lower ripple voltage
corresponds to lower ESR (Equivalent Series
Resistor) of output capacitor. Typically, once the
ESR is satisfied with the ripple voltage, the value
of capacitor is adequate for filtering. The formula
of ripple voltage is as below:
Output
Input
R1
R2
(Ω)
82k
82k
47k
33k
22k
10k
CF
(pF)
1000
360
Voltage (V) Voltage (V) (Ω)
1.8
4
7
36k
12
12
15
18
25
180k
180k
180k
150k
110k
6
360
⎛
⎜
⎝
⎞
⎟
⎟
⎠
1
8
360
⎜
∆VOUT = ∆IL ESR +
8fCOUT
10
15
470
560
The typical input capacitor is 470uF. But as the
temperature decreases, the input capacitor needs
to increase to stabilize the circuit.
Table 1
Example
9
AIC2511
ꢀPHYSICAL DIMENSIONS (unit: mm)
ꢁ TO-263-5
A
S
Y
M
B
O
L
TO-263-5L
E
c2
MILLIMETERS
MIN.
4.06
MAX.
4.83
A
A1
b
0.00
0.51
0.38
0.25
0.99
0.74
c
c2
D
1.14
8.38
1.65
9.65
E
e
9.65
10.67
1.70 BSC
0.25 BSC
A
A
H
14.61
15.88
e
SEE VIEW B
b
L
1.78
--
2.79
1.68
L1
L3
q
WITH PLATING
0°
8°
BASE METAL
SECTION A-A
GAUGE PLANE
SEATING PLANE
L
VIEW B
Note: 1. Refer to JEDEC TO-263BA.
2. Dimension "E" does not include mold flash, protrusions
or gate burrs. Mold flash, protrusion or gate burrs shall not
exceed 6 mil per side .
3. Dimension "D" does not include inter-lead flash or protrusions.
4. Controlling dimension is millimeter, converted inch
dimensions are not necessarily exact.
10
AIC2511
ꢀPHYSICAL DIMENSIONS(Continued) (unit: mm)
ꢁ
TO-220B
E
A
S
Y
M
B
O
L
TO-220B
E1
E1
F
MILLIMETERS
MIN.
MAX.
4.826
A
4.318
A1
A2
b
4.250
8.250
0.690
0.304
4.550
8.550
0.940
0.530
C
D
3.556(REF)
2.743(REF)
D1
d
8.480
9.300
10.44
5.220
E
9.906
4.953
3.708
1.524
6.604
E1
3.962
2.032
7.112
1.397
10.64
9.850
e
e1
F
1.143
9.880
9.090
L
L1
C
e
b
A1
e1
A2
Note : Controlling dimension is millimeter, converted inch
dimensions are not necessarily exact.
11
AIC1595
ꢀPHYSICAL DIMENSIONS(Continued) (unit: mm)
ꢁ
TO-220-5L
E
A
S
Y
M
B
O
L
TO-220-5L
MILLIMETERS
E1
E1
F
MIN.
MAX.
4.826
A
4.064
A1
b
2.032
0.635
0.304
2.921
1.016
0.460
C
D
3.429
7.620
2.620
3.683
9.398
2.870
D1
d
10.668
E
9.779
4.953
3.708
1.524
1.143
13.589
E1
5.220
3.962
2.032
1.397
e
F
L
14.351
e
b
C
A1
Note : Controlling dimension is millimeter, converted inch
dimensions are not necessarily exact.
12
AIC1595
ꢀPHYSICAL DIMENSIONS(Continued) (unit: mm)
ꢁ TO-252-5
E
A
S
Y
M
B
O
L
TO-252-5L
c2
b3
MILLIMETERS
MIN.
2.19
MAX.
A
2.38
A1
b
0.00
0.51
4.32
0.46
0.13
0.71
5.46
0.61
b3
c
c2
D
0.46
5.33
0.89
6.22
E
e
6.35
6.73
A
A
1.27 BSC
e
SEE VIEW B
b
H
9.40
1.40
10.41
1.78
L
L1
L2
L3
θ
2.67 REF
0.51 BSC
WITH PLATING
0.89
0°
2.03
8°
BASE METAL
SECTION A-A
GAUGE PLANE
SEATING PLANE
L
L1
VIEW B
Note: 1. Refer to JEDEC TO-252AD and AB.
2. Dimension "E" does not include mold flash, protrusions
or gate burrs. Mold flash, protrusion or gate burrs shall not
exceed 6 mil per side .
3. Dimension "D" does not include inter-lead flash or protrusions.
4. Controlling dimension is millimeter, converted inch
dimensions are not necessarily exact.
Note:
Information provided by AIC is believed to be accurate and reliable. However, we cannot assume responsibility for use of any
circuitry other than circuitry entirely embodied in an AIC product; nor for any infringement of patents or other rights of third parties
that may result from its use. We reserve the right to change the circuitry and specifications without notice.
Life Support Policy: AIC does not authorize any AIC product for use in life support devices and/or systems. Life support devices or
systems are devices or systems which, (I) are intended for surgical implant into the body or (ii) support or sustain life, and whose
failure to perform, when properly used in accordance with instructions for use provided in the labeling, can be reasonably
expected to result in a significant injury to the user.
13
相关型号：
©2020 ICPDF网 联系我们和版权申明