FP7102XR-LF [FEELING]
28V, 2A Buck Constant Current Switching Regulator for White LED;
| 型号： | FP7102XR-LF |
| 厂家： | 
Feeling Technology |
| 描述： | 28V, 2A Buck Constant Current Switching Regulator for White LED |
| 文件： | 总12页 (文件大小：394K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
FP7102
28V, 2A Buck Constant Current Switching Regulator
for White LED
General Description
The FP7102 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 FP7102 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 pin for enabling, 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 2A 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 &SOP-8L(EP)
Typical Application Circuit
LX
LX
VCC
V
IN
FP7102
ON/OFF
EN
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.
Website: http://www.feeling-tech.com.tw
Rev. 0.93
1/12
FP7102
Function Block Diagram
EN
VCC
Enable
Control
Reference
Regulator
Oscillator
Over Current
Protection
2.50V
FB
36K
Output Drive
Control
Circuits
0. 25V
500
COMP
Thermal
Shutdown
Internal Soft Start
Circuit
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.
Website: http://www.feeling-tech.com.tw
Rev. 0.93
2/12
FP7102
Pin Descriptions
SOP- 8L
Name No. I / O
Description
Error Amplifier Inverting Input
Enable Control
FB
EN
1
2
3
4
5
6
7
8
I
I
COMP
VCC
O
P
P
P
O
O
Error Amplifier Compensation Output
IC Power Supply (PMOS Source)
PMOS High Current Output
PMOS High Current Output
IC Ground
LX
LX
GND
GND
IC Ground
SOP- 8L (EP)
Top View
1
FB
8
7
6
5
GND
GND
LX
Name No. I / O
Description
Error Amplifier Inverting Input
Enable Control
FB
EN
1
2
3
4
5
6
7
8
9
I
2
EN
I
3
COMP
COMP
VCC
O
P
P
P
O
O
P
Error Amplifier Compensation Output
IC Power Supply (PMOS Source)
PMOS High Current Output
PMOS High Current Output
IC Ground
4
VCC
LX
LX
LX
Bottom View
GND
GND
EP
IC Ground
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.
Website: http://www.feeling-tech.com.tw
Rev. 0.93
3/12
FP7102
Marking Information
SOP- 8L & SOP-8L (EP)
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.
Website: http://www.feeling-tech.com.tw
Rev. 0.93
4/12
FP7102
Ordering Information
Part Number
FP7102DR-LF
FP7102XR-LF
Operating Temperature
Package
SOP-8L
MOQ
2500EA
2500EA
Description
Tape & Reel
Tape & Reel
-25°C ~ +85°C
-25°C ~ +85°C
SOP-8L (EP)
Absolute Maximum Ratings
Parameter
Power Supply Voltage
Output Source Current
Error Amplifier Inverting Input
Allowable Dissipation
Symbol
Conditions
Min.
Typ.
Max.
28
Unit
V
VIN
2
A
-0.3
+1.2
650
V
mW
TA≦+25℃
Thermal Resistance Junction to
Ambient
Thermal Resistance Junction to
Case
θJA
θJC
+175
+45
℃ / W
℃ / W
HBM (Human Body Mode)
MM (Machine Mode)
2
KV
V
ESD Susceptibility
200
Storage Temperature
-55
+125
+260
℃
Lead Temperature (soldering, 10
sec)
℃
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.
Website: http://www.feeling-tech.com.tw
Rev. 0.93
5/12
FP7102
Recommended Operating Conditions
Parameter
Symbol
Conditions
Min.
3.6
Typ.
Max.
Unit
V
Supply Voltage
Operating Temperature
VIN
28
85
-25
℃
DC Electrical Characteristics (VCC=6V, TA= 25℃, unless otherwise noted)
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Unit
Reference
Output Voltage
VREF FB connected to COMP
0.245
0.25
0.255
12.5
2
V
△VREF
Input Regulation
2
1
1
mV
VCC＝3.6 V to 25 V
TA＝-25℃ to 25℃
TA＝ 25℃ to 85℃
△VREF
VREF
/
Output Voltage Change with
Temperature
%
2
Oscillator Section
Oscillation Frequency
f
320
5
KHz
%
Frequency Change with Voltage
Δf / ΔV VCC=3.6V to 25V
Frequency Change with
Temperature
Δf / ΔT
5
%
TA = -25℃ to +85℃
Error Amplifier Section
Input Bias Current
IB
-1.0
1.7
-0.2
100
6
1.0
0.2
μA
V / V
MHz
V
Voltage Gain
Av
Frequency Bandwidth
BW
VPOS
VNEG
Av=0 dB
Output Voltage Swing Positive
Output Voltage Swing Negative
Output Source Current
2
0.1
-30
30
V
ISOURCE Vcomp=200mV
ISINK Vcomp=200mV
-15
15
μA
Output Sink Current
μA
Idle Period Adjustment Section
Maximum Duty Cycle
Output Section
VFB =0.2V
TDUTY
100
%
PMOS D-S Voltage
PMOS Source Current
VDSS VCOMP=0.1V
ID
-20
-2
V
A
VCC=5.0V, V FB=0V
70
42
5
150
90
PMOS On Resistance
RDS (ON)
mΩ
μA
VCC=10V, V FB=0V
Output Leakage Current
IL
Thermal Shutdown Section
Thermal shutdown Temperature
150
3
℃
Over Current Protection Section
PMOS OCP Current
IOCP
A
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.
Website: http://www.feeling-tech.com.tw
Rev. 0.93
6/12
FP7102
Parameter
Total Device Section
EN Input Current
Symbol
Conditions
Min.
Typ.
Max.
Unit
IEN
VUPPER
VLOW
EN pin Open
20
μA
V
Upper Threshold Voltage (EN)
Lower Threshold Voltage (EN)
Hysteresis
1.12
0.87
250
4
V
VHYS
210
mV
mA
μA
Average Supply Current
VCC Shutdown
IAVE
6
ISHUTDOWN
15
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.
Website: http://www.feeling-tech.com.tw
Rev. 0.93
7/12
FP7102
Detailed Description
Voltage Reference
A built-in 2.5V reference regulator supplies FP7102 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
FP7102 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:
VFB
IF
R2
IF should not exceed the 2A current capability of FP7102 and therefore R2 minimum value must
be approximately 0.13Ω.
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 FP7102 turns output off. Once
the junction temperature is cooled down to lower than 130℃, FP7102 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.
Website: http://www.feeling-tech.com.tw
Rev. 0.93
8/12
FP7102
Over Current Protection
The FP7102 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.
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.
Website: http://www.feeling-tech.com.tw
Rev. 0.93
9/12
FP7102
Typical Application
FP7102 1W / 3W LED for DC Input Circuit
Dimming Control Circuit
Changing the duty cycle of PWM signal can get different LED current. The PWM signal is
recommended above 10kHz. The application circuit is shown in the following.
The LED current can be calculated by the following equation:
R4(VPWM Duty VFB
)
VFB
R3 R5
ILED
R2
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.
Website: http://www.feeling-tech.com.tw
Rev. 0.93
10/12
FP7102
Package Outline
SOP-8L
UNIT: mm
Max. (mm)
Symbols
Min. (mm)
1.346
A
A1
A2
D
1.752
0.254
1.498
4.978
3.987
6.197
1.270
8°
0.101
4.800
3.810
5.791
0.406
0°
E
H
L
θ°
Note:
1. Package dimensions are in compliance with JEDEC outline: MS-012 AC.
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.
Website: http://www.feeling-tech.com.tw
Rev. 0.93
11/12
FP7102
SOP-8L (EP)
UNIT: mm
Symbols
Min. (mm)
1.346
Max. (mm)
1.752
0.152
1.498
4.978
3.987
6.197
1.270
8°
A
A1
A2
D
0.050
4.800
3.810
5.791
0.406
0°
E
H
L
θ°
Exposed PAD Dimensions:
Symbols
Min. (mm)
Max. (mm)
E1
D1
2.184 REF
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.
Website: http://www.feeling-tech.com.tw
Rev. 0.93
12/12
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