APE1816 Format - Advanced Power Electronics Corp

Advanced Power
Electronics Corp.
APE1816
PWM CONTROL 5A STEP-DOWN CONVERTER
FEATURES
DESCRIPTION
APE1816 consists of step-down switching regulator
with PWM control. These devise include a reference voltage
source, oscillation circuit, error amplifier, internal PMOS and
etc.
APE1816 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%. An
enable function, 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.
Also, an internal compensation block is built in to minimum
external component count.
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 package, providing such
outstanding features as low current consumption. Since this
converter can accommodate an input voltage up to 23V, it is
also suitable for the operation via an AC adapter.
Input Voltage : 4.5V to 23V
Output Voltage : 0.8V to VCC
Duty Ratio : 0% to 100% PWM Control
Oscillation Frequency : 330KHz Typ.
External Soft-Start function.
Thermal Shutdown function.
Short Circuit Protect (SCP).
Built-in internal SW P-channel MOS.
ESOP-8 Pb-Free package
TYPICAL APPLICATION
VIN+12V
3
C2
470uF
R1
100K
C1
R3
4R7
R2
2K
1
2
0.1uF
PVCC
SW
OCSET
SS
VCC
7 EN
C7
VSS
2
15uH
R5
4.7K
6
D1
B540A
8
5
VIN+5V
3
C2
470uF
R1
100K
C1
R3
4R7
R2
3.75K 1
2
0.1uF
PVCC
SW
FB
OCSET
SS
VCC
7 EN
C7
APE1816
C3
0.1uF
10nF
VSS
1
4
C5
C4
0.1uF
470uF
R6
1.5K
C6
47nF
APE1816
C3
0.1uF
10nF
FB
VOUT = 3.3V/5A
L1
1
4
VOUT = 1.8V/5A
L1
2
10uH
R5
2.5K
6
D1
B540A
8
5
C5
C4
0.1uF
470uF
R6
2K
C6
0.1uF
R5
)
R6
VFB = 0.8V ; R4 suggest 0.8K ~ 4k
VOUT = VFB x (1 +
L1 recommend value (VIN=12V, IOUT=5A,)
VOUT
1.8 V
2.5V
3.3V
5V
L1
10uH
10uH
15uH
15uH
Data and specifications subject to change without notice
1
200912082
Advanced Power
Electronics Corp.
APE1816
ORDERING/PACKAGE INFORMATION
( Top View )
APE1816X
Package Type
OCSET
1
8
SS
VCC
2
7
EN
PVCC
3
SW
4
MP : ESOP-8
AX5913
SW
6
FB
5
VSS
ESOP-8
ABSOLUTE MAXIMUM RATINGS (at TA=25°C)
VCC PIN Voltage(VCC) -------------------------------------
VSS -0.3V to VSS +25 V
Feedback PIN Voltage(VFB) -----------------------------
VSS -0.3V to VCC
ON/OFF PIN Voltage(VEN) ------------------------------- VSS -0.3V to VCC + 0.3V
Switch PIN Voltage(VSW ) --------------------------------- VSS -0.3V to VCC + 0.3V
Power Dissipation(PD) ------------------------------------- Internally Limited
Storage Temperature Range(T ST) ---------------------
-40°C To 150°C
Operating Junction Temperature(T OPJ) --------------- -20°C To 125°C
Junction Temperature Range(T J) ----------------------
-40°C To 125°C
Operating Supply Voltage(VOP) ------------------------- +4.5V to +23V
Switching Current(ISW ) ------------------------------------
6.5A
Thermal Resistance from Junction to Case(Rth JC)
15°C/W
Thermal Resistance from Junction to Ambient(RthJA)
40°C/W
Note. RthJA is measured with the PCB copper area(need connect to Exposed pad) of approximately 1 in2(Multi-layer).
ELECTRICAL SPECIFICATIONS (VIN=12V, TA=25°C, unless otherwise specified)
Parameter
MIN
0.784
TYP
0.8
MAX
0.816
UNITS
VFB=1.2V force driver off
IOUT=0.2A
-
3
0.1
5
0.5
mA
VEN =0V
-
2
10
uA
-
1
0.2
2
0.5
%
110
140
uA
uA
SYM
VFB
TEST CONDITION
IOUT=0.2A
Feedback Bias Current
ICCQ
IFB
Shutdown Supply Current
ISD
Feedback Voltage
Quiescent Current
Line Regulation
△VOUT/VOUT VCC =8V~23V, IOUT=0.3A
Load Regulation
△VOUT/VOUT IOUT = 0.1 to 2.5A
V
uA
%
OCSET Pin Bias Current
IOCSET
95
SS Pin Current
ISS
FOSC
-
4
-
SW pin
260
330
400
KHz
VFB=0V
80
-
-
KHz
-
0.8
Oscillation Frequency
Short Circuit Frequency
EN Pin Logic Input Threshold Voltage
EN Pin Input Current
High (regulator ON)
2
VSL
Low (regulator OFF)
-
ISH
VEN=2.5V (ON)
-
20
-
uA
VEN=0.3V (OFF)
VCC=5V, VFB=0V
-
-10
-
uA
-
70
100
VCC=12V, VFB=0V
-
45
70
IOUT = 3A
-
92
-
IOUT = 5A
-
91
-
-
135
-
FOSC1
VSH
ISL
Internal MOSFET RDSON
RDSON
Efficiency
EFFI
Thermal Shutdown Temp
TSD
VOUT=5V
V
mΩ
%
°C
2
Advanced Power
Electronics Corp.
APE1816
PIN DESCRIPTIONS
PIN SYMBOL
VSS
PIN DESCRIPTION
GND Pin
Soft-Start pin
SS
Feedback Pin
FB
Power -Off Pin
H : Normal Operation(Step-down)
EN
L : Step-down Operation Stopped
(All circuits deactivated)
Driver Power Supply Pin
PVCC
Switch Pin. Connect External Inductor & Diode here.
SW
Add an External Resistor to Set Max. Switch Output Current.
OCSET
VCC
IC Power Supply Pin
BLOCK DIAGRAM
SW
VCC
Current
Limit
PVCC
Oscillator
Circuit
Reference Voltage
+
PWM Switched
Control Circuit
Thermal
Shutdown
4uA
110uA
VEN
EN
-
OCSET
FB
VSS
SS
FUNCTION PIN DESCRIPTION
PWM Control
The APE1816 consists of DC/DC converters that employ a pulse-width
modulation (PWM) system. In converters of the APE1816, the pulse width varies in a
range from 0 to 100%, according to the load current. The ripple voltage produced by
the switching can easily be removed through a filter because the switching frequency
remains constant. Therefore, these converters provide a low-ripple power over broad
ranges of input voltage and load current.
3
Advanced Power
Electronics Corp.
APE1816
FUNCTION PIN DESCRIPTION
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
equation:
VOUT=0.8V x (1+R5/R6)
Table 1 Resistor select for
output voltage setting
VOUT
R6
R5
5V
1.3K
6.8K
3.3V
1.5K
4.7K
2.5V
2.2K
4.7K
1.8V
2K
2.5K
1.5V
2.2K
2.0K
1.2V
3K
1.5K
1.0V
3K
0.75K
RDS(ON) Current Limiting
The current limit threshold is setting by the external resistor (R2) connecting from
VCC supply to OCSET pin. The internal 110uA sink current crossing the resistor sets
the voltage at pin of OCSET. When the PWM voltage is less than the voltage at
OCSET, an over-current condition is triggered. Please refer to the formula for setting
the current limit value:
ISW(MIN) = (IOCSET x R2 +0.05) / RDS(ON)
(Normally, The ISW(MAX) setting more than IOUT 1.0A ).
Example:
ISW = (110u x 2K + 0.05)/ 45m= 6.67A (Vin=12V)
ISW = (110u x 3.75K + 0.05)/ 70m= 6.6A (Vin=5V)
(TA=25oC)
Inductor Selection
For most designs, the operating inductor range is 10µH to 15µH. The inductor
value can be derived from the following equation:
L= [VOUT x (VIN-VOUT)] / (VIN x ∆IL x fosc)
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 15% of the maximum load current 5A, ∆IL=0.75A. 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 (5A+0.38A).
4
Advanced Power
Electronics Corp.
APE1816
FUNCTION PIN DESCRIPTION
Input Capacitor
The input current to the step-down converter is discontinuous, and so a capacitor
is required to supply the AC current to the step-down converter while maintaining the
DC input voltage. A low-ESR capacitor is required to keep the noise at the IC to a
minimum. The low-ESR electrolytic capacitor may also suffice. The input capacitor
value should be greater than 470µF. However since it absorbs the input switching
current it requires an adequate ripple current rating. Its RMS current rating should be
greater than approximately 1/2 of the DC load current. For insuring stable operation
CIN should be placed as close to the IC as possible. Alternately a smaller high quality
ceramic 0.1uF capacitor may be placed closer to the IC and a larger capacitor placed
further away. If using this technique, it is recommended that the larger capacitor be a
electrolytic type.
Output Capacitor
The output capacitor is required to maintain the DC output voltage. Low ESR
capacitors are preferred to keep the output voltage ripple low. The characteristics of
the output capacitor also affect the stability of the regulation control system. The lowESR electrolytic capacitors are recommended. The output capacitor value should be
greater than 470µF.
5
Advanced Power
Electronics Corp.
APE1816
TYPICAL PERFORMANCE CHARACTERISTICS
Output Voltage vs. Output Current
Output Voltage vs. Load Current
3.40
O u tp u t V o lta g e , V O U T (V )
100%
E ffic ie n c y (% )
80%
60%
40%
20%
- 12V to 5V
- 5V to 3.3V
1
2
3
4
3.36
3.34
3.32
3.30
3.28
3.26
3.24
3.22
3.20
0%
0
3.38
0A
5
0.5A
1A
1.5A
2A
2.5A
3A
Output Current , IOUT (A)
Output Current, IOUT (A)
Current Limit Level (Peak Current) vs. Junction Temperature
Output Voltage vs. Input Voltage
3.4
14
3.35
Output Voltage , V OUT (V)
C u r r e n t L im it L e v e l , I L IM (A )
12
10
8
6
4
2
3.3
3.25
3.2
3.15
3.1
3.05
3
0
-50
-25
0
25
50
75
100
125
150
4
6
Junction Temperature , TJ (℃)
VIN Input Current vs. Supply Voltage
10
12
14
Reference Voltage vs. Junction Temperature
VOUT=3.3V
0.82
R e fe re n c e V o lta g e ,V R E F (V )
3.5
V IN In p u t C u r r e n t , I V IN ( m A )
8
Input Voltage , VIN (V)
3
2.5
2
1.5
1
0.5
0.816
0.812
0.808
0.804
0.8
0.796
0.792
0.788
0.784
0.78
0
5
6
7
8
9
10
11
Supply Voltage , VIN (V)
12
13
14
-50
-25
0
25
50
75
100
125
150
Junction Temperature , TJ (℃)
6
Advanced Power
Electronics Corp.
APE1816
TYPICAL PERFORMANCE CHARACTERISTICS
Oscillator Frequency vs.
Junction Temperature
440
Oscillator Frequency ,F osc (KHz)
420
400
380
360
340
320
300
280
260
240
220
200
-50
-30
-10
10
30
50
70
90
110
130
150
Junction Temperature , TJ (℃)
Power ON
VIN=12V, VOUT = 3.3V, IOUT = 3A, L1=10uH
Power OFF
VIN=12V, VOUT = 3.3V, IOUT = 3A, L1=10uH
VIN
VIN
VOUT
VOUT
IOUT
IOUT
Current Limit
VOUT
IOUT
Load Transient Response
VOUT
IOUT
7
Advanced Power
Electronics Corp.
APE1816
PACKAGE OUTLINES
H
Y
Expose Pad
E
X
L
DETAIL A
b
D
e
A1
C
A
A2
7 (4X)
y
DETAIL A
Dimensions In Millimeters
Min.
Nom.
Max.
1.40
1.60
1.75
0.10
0.25
1.30
1.45
1.50
0.19
0.20
0.25
4.80
4.90
5.00
Dimensions In Inches
Min.
Nom.
Max.
0.055
0.063
0.069
0.040
0.100
0.051
0.057
0.059
0.0075
0.008
0.010
0.189
0.193
0.197
E
H
L
b
e
y
3.80
5.79
0.38
0.33
X
Y
θ
Symbol
A
A1
A2
C
D
4.00
6.20
1.27
0.51
0.150
0.228
0.015
0.013
-
3.90
5.99
0.71
0.41
1.27 TYP
-
0.157
0.244
0.050
0.020
-
0.154
0.236
0.028
0.016
0.050 TYP
-
0.10
-
2.34
2.34
-
-
0.092
0.092
-
0O
-
8O
0O
-
8O
0.004
Part Marking Information & Packing : ESOP-8
Part Number
Package Code
1816MP
YWWSSS
Date Code (YWWSSS)
Y:Last Digit Of The Year
WW:Week
SSS:Sequence
8