APE1811D [A-POWER]
IC SWITCHING REGULATOR, Switching Regulator or Controller;
| 型号： | APE1811D |
| 厂家： | 
ADVANCED POWER ELECTRONICS CORP. |
| 描述： | IC SWITCHING REGULATOR, Switching Regulator or Controller 开关 |
| 文件： | 总9页 (文件大小：1173K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Advanced Power
Electronics Corp.
APE1811
PWM CONTROL 3A STEP-DOWN CONVERTER
FEATURES
DESCRIPTION
APE1811 consists of step-down switching regulator
with PWM control. These devise include a reference voltage
source, oscillation circuit, error amplifier, internal PMOS and
etc.
Input Voltage : 8V to 40V
Output Voltage : 3.3V to 38V
Duty Ratio : 0% to 100% PWM Control
Oscillation Frequency Range is 50K~350KHz
by Outside Resistance Setting
APE1811 provides low-ripple power, high efficiency,
and excellent transient characteristics. The PWM control
circuit is able to the duty ratio linearly form 0 up to 100%.
This converter is build out soft start function that prevents
overshoot and inrush current at startup. An over current
protect function and short circuit protect function are built
inside, and when OCP or SCP happens, the operation
frequency will be reduced. The operating frequency is
decided by outside resistance. An external compensation is
easily to system stable; the low ESR output capacitor can
be used.
Enable with Soft-Start Function
Current Limit, Short Circuit Protect (SCP)
and Thermal Shutdown Protection
Built-in Internal SW P-channel MOS.
ESOP-8 & PDIP-8 Pb-Free Package
Halogen Free Product
With the addition of an internal P-channel Power MOS,
a coil, capacitors, and a diode connected externally, these
ICs can function as step-down switching regulators. They
serve as ideal power supply units for portable devices when
coupled with the ESOP-8 packages, providing such
outstanding features as low current consumption. Since this
converter can accommodate an input voltage up to 40V, it is
also suitable for the operation via an AC adapter.
TYPICAL APPLICATION
(1) EL Cap
VIN +8~40V
VOUT = 5V/3A
L1
APE1811
1
2
SW
FB
VCC
C1
1uF
VGATE
D1
B340
R1
5.6K
C2
C5
470uF
C6
0.1uF
C4
C3
EN/ SS
GND
COMP
OSC
0.1uF
470uF
C10
0.1uF
R5
18K
(Option )
C7
R4
1.1K
R2
0.1uF
R3
C9
R1
R4
VOUT= VFB x(1 +
)
VFB= 0.815V ; R4 suggest0.8K ~ 3k
EL Capacitor Compensation Table
COUT ESR Range Frequency (Hz) VIN Range
R2
C9
C2
L1
50K
470
470
470
470
470
470
470
470
4n7
4n7
4n7
4n7
4n7
4n7
4n7
4n7
2700p
1200p
1000p
1200p
2700p
1500p
560p
100u
68u
33u
22u
100u
68u
33u
22u
150K
30m~80m
Ω
250K
350K
50K
8~40V
150K
250K
350K
80m~300m
Ω
270p
Data and specifications subject to change without notice
1
201210052
Advanced Power
Electronics Corp.
APE1811
TYPICAL APPLICATION
(2) Tantalum Chip Cap
VIN +8~40V
VOUT = 5V/ 3A
APE1811
L1
1
2
SW
VCC
C1
1uF
VGATE
D1
B340
R1
5.6K
FB
C2
C5
470 uF
C6
0.1uF
C4
C3
0.1uF
EN/ SS
GND
COMP
OSC
100u/16V
C10
0.1 uF
R5
18K
(Option )
C7
R4
1.1K
R2
C9
0.1uF
R3
R1
R4
VOUT= VFB x (1 +
)
VFB= 0.815V ; R4 suggest0.8K ~ 3k
Tantalum Capacitor Compensation Table
Frequency (Hz)
50K
VIN Range
R2
C9
1n
C2
L1
750
470
470
2700p
1000p
560p
100uH
66uH
33uH
8~40V
150K
4n7
10n
300K
PACKAGE/ORDERING INFORMATION
( Top View )
( Top View )
1
2
3
4
8
7
6
5
OSC
COMP
FB
APE1811 X
EN/SS
VSS
1
2
3
4
OSC
8
7
6
5
EN/SS
VSS
COMP
FB
Package Type
SW
VGATE
VGATE
MP : ESOP-8
D : PDIP-8
SW
SW
VCC
VCC
PDIP-8
ESOP-8
ABSOLUTE MAXIMUM RATINGS (at TA=25°C)
VCC PIN Voltage(VCC) --------------------------------------------- VSS -0.3V to VSS +45 V
Feedback PIN Voltage(VFB) ------------------------------------- VSS -0.3V to 6V
ON/SS PIN Voltage(VEN/SS) -------------------------------------- VSS -0.3V to 6V
OSC PIN Voltage(VOSC) ------------------------------------------ VSS -0.3V to 3V
COMP PIN Voltage(VCOMP) -------------------------------------- VSS -0.3V to 6V
VGATE PIN Voltage(VGATE) ------------------------------------- VSS -0.3V to VCC
Switch PIN Voltage(VSW) ----------------------------------------- VSS -0.3V to VCC +0.3V
Power Dissipation(PD) -------------------------------------------- Internally Limited
Storage Temperature Range(TST) ----------------------------- -65°C To 150°C
Operation Junction Temperature Range(TOPJ) ------------- -40°C To 125°C
Operating Supply Voltage(VOP) --------------------------------- 8V to 40V
Thermal Resistance from Junction to Case(Rthjc
)
ESOP-8---- 15°C/W
PDIP-8----- 50°C/W
Note.
Thermal Resistance from Junction to Ambient(Rthja
)
ESOP-8---- 40°C/W
PDIP-8----- 100°C/W
Note. Rthja is measured with the PCB copper area(need connect to Exposed Pad) of approximately 1.5 in2(Multi-layer).
2
Advanced Power
Electronics Corp.
APE1811
ELECTRICAL SPECIFICATIONS (VIN=12V, TA=25°C, unless otherwise specified)
UNITS
Parameter
SYM
TEST CONDITION
MIN
TYP MAX
VCC = 10V~30V, IOUT = 0 to 2A,
VFB
Feedback Voltage
0.8
0.815 0.83
V
Tj=-20oC~125oC
VFB=1.2V force driver off
IOUT=0.1A
ICCQ
IFB
Quiescent Current
-
-
3
0.1
3
6
0.5
6
mA
uA
Feedback Bias Current
Shutdown Supply Current
Switch Current
ISD
VEN/SS =0V
-
mA
A
ISW
3.5
50
45
-
-
FOSC
FOSC1
Adjustable Frequency Range
-
380
65
KHz
KHz
VCC = 10V~30V
Short Frequency
55
EN/SS Pin Shutdown Logic Input
Threshold Voltage
VENL
-
-
0.8
V
IEN/SS
VEN/SS=0V
EN/SS Pull high Current
-
-
-
-
5
-
uA
mΩ
%
Internal MOSFET RDSON
RDSON
VCC=12V, VFB=0V
130
91
180
VCC = 12V, VOUT = 5V, IOUT = 2A
VCC = 30V, VOUT = 5V, IOUT = 2A
-
-
Efficiency
EFFI
87
%
PIN DESCRIPTIONS
PIN SYMBOL
VSS
PIN DESCRIPTION
GND Pin
FB
EN/SS
SW
Feedback Pin
ON/OFF Shutdown and Soft-start pin
Switch Pin. Connect External Inductor & Diode here.
VGATE
VCC
Driver GATE clamping pin. The pin must connect a 1uF capacitor to VCC
IC Power Supply Pin
COMP
OSC
Compensation pin
Frequency Set Pin. The pin connect a resistance to GND.
BLOCK DIAGRAM
EN / SS
V
CC
5uA
CURRENT
SOURCE
BIAS
2. 5 V
REGULATOR
1.23V
REFERENCE
START - UP
Current
limit
Oscillator
0.815 V
+
PWM Switched
-
Control Circuit
.
COMP
+
_
.
AMP
COMP
_
VGATE
Vss
Thermal
Shutdown
FB
COMP
OSC
SW
3
Advanced Power
Electronics Corp.
APE1811
FUNCTION DESCRIPTION
EN/SS
This pin can be supplied shutdown or soft start function. It is inside pull high
function. For normal application, the pin must be connected a capacitor to ground.
There is a 5uA current to charge this capacitor, vary the different capacitor value to
control soft start time. Allow the switching regulator circuit to be shutdown pulling this
pin below a 0.8V threshold voltage.
OSC
External frequency set pin. The pin connects a resistance (R3) to reduce system
frequency. This converter’s frequency can be set from 50K to 350KHz, please refer
the below table to set frequency.
T=Room Temperature
R3 (Ω)
10M
52K
240K
150K
110K
250K
68K
Frequency (Hz)
350K
COMP
Compensation pin. For EL output capacitor application, the COMP pin connects
R2 and C9 to ground for all condition; please refer the compensation table.
APPLICATION INFORMATION
Setting the Output Voltage
Application circuit item shows the basic application circuit with adjustable output
version. The external resistor sets the output voltage according to the following
R1
⎛
⎞
⎟
= 0.815V × 1+
⎜
VOUT
R4
⎝
⎠
Table 1 Resistor select for output voltage setting
VOUT
5V
R4
R1
1.1K
2.7K
5.6K
8.2K
3.3V
4
Advanced Power
Electronics Corp.
APE1811
Inductor Selection
For most designs, the different frequency can be reducing the inductor value;
The APE1811 is suggested 22µH to 100µH for 350K to 50KHz frequencies. Please
refer the below table to design.
L1 recommend value (VIN=8~40V ,VOUT=5V, IOUT=3A)
Frequency (Hz)
L1 Value (H)
50K
150K
68uH
250K
33uH
350K
22uH
100uH
Where is inductor Ripple Current. Large value inductors lower ripple current and
small value inductors result in high ripple currents. Choose inductor ripple current
approximately 20% of the maximum load current 3A, ΔIL=0.6A. The DC current rating
of the inductor should be at least equal to the maximum load current plus half the
ripple current to prevent core saturation (3A+0.3A).
Input Capacitor Selection
This capacitor should be located close to the IC using short leads and the voltage
rating should be approximately 1.5 times the maximum input voltage. The RMS
current rating requirement for the input capacitor of a buck regulator is approximately
1⁄2 the DC load current. A low ESR input capacitor sized for maximum RMS current
must be used. A 470µF low ESR capacitor for most applications is sufficient.
Output Capacitor Selection
The output capacitor is required to filter the output and provide regulator loop
stability. The important capacitor parameters are; the 100 KHz Equivalent Series
Resistance (ESR), the RMS ripples current rating, voltage rating, and capacitance
value. For the output capacitor, the ESR value is the most important parameter. The
ESR can be calculated from the following formula.
V
RIPPLE=∆IL x ESR = 0.6A x 80mΩ = 48mV
An aluminum electrolytic capacitor's ESR value is related to the capacitance and
its voltage rating. In most case, higher voltage electrolytic capacitors have lower ESR
values. Most of the time, capacitors with much higher voltage ratings may be needed
to provide the low ESR values required for low output ripple voltage. It is
recommended to replace this low ESR capacitor by using a 470µF low ESR values <
5
Advanced Power
Electronics Corp.
APE1811
TYPICAL PERFORMANCE CHARACTERISTICS
VIN VS Quiescent Current
VIN VS Feedback Voltage
6
5
4
3
2
1
0
0.83
0.825
0.82
0.815
0.81
0.805
0.8
F=300KHz
IOUT=300mA
VFB=1.2V
8
12 16 20 24 28 32 36 40
VIN (V)
8
12
16
20
24
28
32
36
40
VIN (V)
IOUT VS Feedback Voltage
Temperature VS Feedback Voltage
0.83
0.825
0.82
0.83
0.825
0.82
0.815
0.81
0.805
0.8
0.815
0.81
0.805
0.8
VIN=36V
VIN=12V
2.5
IOUT=0.2A
0
0.5
1
1.5
2
3
-40℃ -20℃ 0℃ 25℃ 50℃ 85℃ 105℃ 125℃
Temperature
IOUT (A)
Temperature VS Quiescent Current
Temperature VS Frequency
400
350
300
250
200
150
100
50
6
5
4
3
2
1
0
VIN=12V
IOUT=0.3A
VIN=36V
VFB=1.2V
0
-40℃ -20℃ 0℃ 25℃ 50℃ 85℃ 105℃ 125℃
Temperature
-40℃ -25℃ 0℃ 25℃ 50℃ 85℃ 105℃ 125℃
Temperature
6
Advanced Power
Electronics Corp.
APE1811
TYPICAL PERFORMANCE CHARACTERISTICS
Efficiency Test (60KHz)
Efficiency Test (150KHz)
100%
90%
80%
70%
60%
50%
40%
30%
20%
10%
0%
100%
90%
80%
70%
60%
50%
40%
30%
20%
10%
0%
VIN=10V
VIN=20V
VIN=10V
VIN=20V
VIN=30V
VIN=30V
VOUT=5V
VOUT=5V
0
0.5
1
1.5
2
2.5
3
0
0.5
1
1.5
2
2.5
3
IOUT (A)
IOUT (A)
Efficiency Test (330KHz)
100%
90%
80%
70%
60%
50%
40%
30%
20%
10%
0%
VIN=10V
VIN=20V
VIN=30V
VOUT=5V
0
0.5
1
1.5
2
2.5
3
IOUT (A)
7
Advanced Power
Electronics Corp.
APE1811
TYPICAL PERFORMANCE CHARACTERISTICS
Power-ON Wave (F=60KHz)
Power-ON Wave (F=60KHz)
(VIN=24V, VOUT=5V, Load=2A, CEN/SS=0.1uF)
(VIN=12V, VOUT=5V, Load=2A, CEN/SS=0.1uF)
Enable-ON Wave (60KHz)
Enable-ON Wave (60KHz)
(VIN=12V, VOUT=5V, Load=2A, CEN/SS=0.1uF)
(VIN=24V, VOUT=5V, Load=2A, CEN/SS=0.1uF)
Load Transient (F=60KHz)
Load Transient (F=60KHz)
(VIN=12V, VOUT=5V, Load=0.3~2.7A)
(VIN=24V, VOUT=5V, Load=0.3~2.7A)
8
Advanced Power
Electronics Corp.
APE1811
MARKING INFORMATION
ESOP-8
Part Number
Package Code
1811MP
YWWSSS
Date Code (YWWSSS)
Y：Last Digit Of The Year
WW：Week
SSS：Sequence
PDIP-8
Part Number
Package Code
1811D
YWWSSS
Date Code (YWWSSS)
Y：Last Digit Of The Year
WW：Week
SSS：Sequence
9
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