28V, 3A Buck Constant Current Switching Regulator for White LED

28V, 3A Buck Constant Current Switching Regulator for White LED
FP7103
28V, 3A Buck Constant Current Switching Regulator
for White LED
General Description
The FP7103 is a PWM control buck converter designed to provide a simple, high efficiency
solution for driving high power LEDs. With a 0.25V reference voltage feedback control to minimize
power dissipation, an external resistor sets the current as needed for driving various types of LEDs.
The FP7103 includes a high current P-MOSFET to realize high efficiency and excellent transient
characteristics. The PWM control circuit is able to change the duty ratio linearly from 0 up to 100%.
Other features include user accessible EN/DIM pin for enabling and PWM dimming of LEDs, thermal
shutdown, cycle-by cycle current limit and over current protection.
Features







Wide Supply Voltage Operating Range: 3.6 to 28V
Built-in P-MOSFET for 3A Loading Capability
Precision Feedback Reference Voltage: 0.25V (2%)
Low Current Consumption: 4mA
Internal Fixed Oscillator Frequency: 320KHz (Typ.)
Internal Soft-Start Function (SS)
Over Current Protection
 Package: SOP-8L
Typical Application Circuit
VIN
LX
VCC
LX
FP7103
Dimming
EN /
DIM
FB
COMP
GND
GND
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Rev. 0.91
Website: http://www.feeling-tech.com.tw
1/11
FP7103
Function Block Diagram
EN /
DIM
VCC
Enable
Control
Reference
Regulator
Oscillator
2.50V
Over Current
Protection
36K
FB
Output Drive
Control Circuits
0.25V
500
COMP
Thermal
Shutdown
GND
GND
LX
LX
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Rev. 0.91
Website: http://www.feeling-tech.com.tw
2/11
FP7103
Pin Descriptions
SOP- 8L
Name
FB
No. I / O
1
I
Description
Error Amplifier Inverting Input
FP7103
9Fa-86L
EN / DIM
2
I
Enable Control
COMP
3
O
Error Amplifier Compensation Output
VCC
4
P
IC Power Supply (PMOS Source)
LX
5
P
PMOS High Current Output
LX
6
P
PMOS High Current Output
GND
7
O
IC Ground
GND
8
O
IC Ground
SOP-8L (EP)
Top View
1
8
GND
EN / DIM
2
7
GND
COMP
3
6
LX
VCC
4
5
LX
FP7103
9Fa-86L
FB
Bottom View
Name
No. I / O
Description
FB
1
I
Error Amplifier Inverting Input
EN / DIM
2
I
Enable Control
COMP
3
O
Error Amplifier Compensation Output
VCC
4
P
IC Power Supply (PMOS Source)
LX
5
P
PMOS High Current Output
LX
6
P
PMOS High Current Output
GND
7
O
IC Ground
GND
8
O
IC Ground
EP
9
P
Exposed PAD. Must connect to LX
EP
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Rev. 0.91
Website: http://www.feeling-tech.com.tw
3/11
FP7103
Marking Information
SOP-8L & SOP-8L (EP)
FP7103
Halogen Free
Lot Number
Internal ID
Per-Half Month
Year
Halogen Free: Halogen free product indicator
Lot Number: Wafer lot number’s last two digits
For Example: 132386TB  86
Internal ID: Internal Identification Code
Per-Half Month: Production period indicated in half month time unit
For Example: January → A (Front Half Month), B (Last Half Month)
February → C (Front Half Month), D (Last Half Month)
Year: Production year’s last digit
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Rev. 0.91
Website: http://www.feeling-tech.com.tw
4/11
FP7103
Ordering Information
Part Number
Operating Temperature
Package
MOQ
Description
FP7103DR-LF
-25°C ~ +105°C
SOP-8L
2500EA
Tape & Reel
FP7103XR-LF
-25°C ~ +105°C
SOP-8L (EP)
2500EA
Tape & Reel
Absolute Maximum Ratings
Parameter
Max.
Unit
28
V
3
A
+1.2
V
650
mW
θJA
+175
℃/W
θJC
+45
℃/W
Symbol
Power Supply Voltage
Conditions
Min.
Typ.
VIN
Output Source Current
Error Amplifier Inverting Input
Allowable Dissipation
Thermal Resistance Junction to
Ambient
Thermal Resistance Junction to
Case
ESD Susceptibility
-0.3
TA≦+25℃
HBM (Human Body Mode)
MM (Machine Mode)
Storage Temperature
Lead Temperature (soldering, 10
sec)
-55
2
KV
200
V
+125
℃
+260
℃
IR Re-flow Soldering Curve
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Rev. 0.91
Website: http://www.feeling-tech.com.tw
5/11
FP7103
Recommended Operating Conditions
Parameter
Symbol
Supply Voltage
Conditions
VIN
Operating Temperature
Min.
Max.
Unit
3.6
Typ.
28
V
-25
105
℃
DC Electrical Characteristics (VCC=6V, TA= 25℃, unless otherwise noted)
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Unit
0.245
0.25
0.255
V
mV
Reference
Output Voltage
VREF
FB connected to COMP
Input Regulation
△VREF VCC=3.6 V to 25 V
2
12.5
Output Voltage Change with
Temperature
△VREF / TA=-25℃ to +25℃
VREF TA=+25℃ to +85℃
1
2
1
2
%
Oscillator Section
Oscillation Frequency
Frequency Change with Voltage
Frequency Change with
Temperature
f
320
KHz
Δf / ΔV VCC=3.6V to 25V
5
%
Δf / ΔT TA = -25℃ to +85℃
5
%
Error Amplifier Section
Input Bias Current
IB
Voltage Gain
Av
Frequency Bandwidth
BW
Output Voltage Swing Positive
VPOS
Output Voltage Swing Negative
VNEG
Output Source Current
-1.0
Av=0 dB
1.7
ISINK
Vcomp=200mV
1.0
μA
100
V/V
6
MHz
2
V
0.1
ISOURCE Vcomp=200mV
Output Sink Current
-0.2
0.2
V
-15
-30
μA
15
30
μA
100
%
-20
V
-3
A
Idle Period Adjustment Section
Maximum Duty Cycle
TDUTY VFB =0.2V
Output Section
PMOS D-S Voltage
VDSS
PMOS Source Current
ID
PMOS On Resistance
RDS (ON)
Output Leakage Current
IL
VCOMP=0.1V
VCC=5.0V, V FB=0V
40.5
52
VCC=10V, V FB=0V
64
87
VDS=-24V, VGS=0V
-1
mΩ
μA
Thermal Shutdown Section
Thermal shutdown Temperature
150
℃
4
A
Over Current Protection Section
PMOS OCP Current
IOCP
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Rev. 0.91
Website: http://www.feeling-tech.com.tw
6/11
FP7103
Parameter
Symbol
Conditions
IEN
EN pin Open
Min.
Typ.
Max.
Unit
20
μA
Total Device Section
EN Input Current
Upper Threshold Voltage (EN)
VUPPER
1.12
V
Lower Threshold Voltage (EN)
VLOW
0.87
V
Hysteresis
VHYS
250
mV
Average Supply Current
IAVE
4
Ishutdown
15
VCC Shutdown Current
210
6
mA
μA
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Rev. 0.91
Website: http://www.feeling-tech.com.tw
7/11
FP7103
Detailed Description
Voltage Reference
A built-in 2.5V reference regulator supplies FP7103 internal circuits. Also, this 2.5V reference
voltage is divided down by an internal resistive divider to provide a 0.25V precision reference voltage to
the error amplifier non-inverting terminal.
Setting the LED Current
FP7103 is a constant current buck regulator. The LEDs are connected between VOUT and FB pin
as shown in the Typical Application Circuit section. The FB pin is 0.25V in regulation. Therefore, the
LEDs current IF is set by VFB and the resistor R2 connected between FB and ground by the following
equation:
IF 
VFB
R2
IF should not exceed the 3A current capability of FP7103 and therefore R2 minimum must be
approximately 0.083Ω
Output Voltage
The output voltage is primarily determined by the number of LEDs(n) connected between VOUT
and FB pin. Therefore, VOUT can be written as:
VOUT  ((n  VF )  VFB )
Where VF is the forward voltage of one LED at the set LED current level (see LED manufacturer
datasheet for forward characteristics curve)
Oscillator
The fixed PWM frequency is generated by an internal oscillator. Its typical values are 320KHz.
Thermal Protection
The thermal protection is triggered when junction temperature is higher than 150℃ that may
occurs by an abnormal heavy current loading. When this happens, the FP7103 turns output off. Once
the junction temperature is cooled down to lower than 150℃, FP7103 starts again and turns the power
switch on.
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Rev. 0.91
Website: http://www.feeling-tech.com.tw
8/11
FP7103
Over Current Protection
The FP7103 uses cycle-by-cycle current limit to protect the internal power switch. During each
switching cycle, a current limit comparator detects if the power switch current exceeds the internal
setting current. If it does, over current protection function decrease the oscillator frequency to prevent
thermal issue.
Typical Application
FP7103 1W / 3W LED for DC Input Circuit
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Rev. 0.91
Website: http://www.feeling-tech.com.tw
9/11
FP7103
Package Outline
SOP-8L
UNIT: mm
Symbols
Min. (mm)
Max. (mm)
A
1.346
1.752
A1
0.101
0.254
D
4.800
4.978
E
3.810
3.987
H
5.791
6.197
L
0.406
1.270
θ°
0°
8°
A2
1.498
Note:
1. Package dimensions are in compliance with JEDEC outline: MS-012 AA.
2. Dimension “D” does not include molding flash, protrusions or gate burrs.
3. Dimension “E” does not include inter-lead flash or protrusions.
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Rev. 0.91
Website: http://www.feeling-tech.com.tw
10/11
FP7103
SOP-8L (EP)
UNIT: mm
Symbols
Min. (mm)
Max. (mm)
A
1.346
1.752
A1
0.050
0.152
A2
1.498
D
4.800
4.978
E
3.810
3.987
H
5.791
6.197
L
0.406
1.270
θ°
0°
8°
Exposed PAD Dimensions:
Symbols
Min. (mm)
Max. (mm)
E1
2.184 REF
D1
2.971 REF
Note:
1.
Package dimensions are in compliance with JEDEC outline: MO-178 AA.
2.
Dimension ”D” does not include molding flash, protrusions or gate burrs.
3.
Dimension “E” does not include inter-lead flash or protrusions
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Rev. 0.91
Website: http://www.feeling-tech.com.tw
11/11
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