FP7208/FP7208B
Non-Synchronous PWM Boost Controller for LED Driver
General Description
The FP7208 and FP7208B are boost topology switching regulator for LED driver. They provide
built-in gate driver pin for driving external N-MOSFET. The non-inverting input of error amplifier
connects to a 0.1V default reference voltage. They have programmable soft start time set by external
capacitors, and over voltage protection set by external resistors. FP7208B has programmable
frequency set by external resistor. The LED current can be adjusted by applying an external signal to
the EN pin. The EN pin accepts either a DC voltage or a PWM signal. The PWM signal filter
components are contained within the chip.
The FP7208B is available in the small footprint DFN-10L package to fit in space-saving PCB
layout for application fields.
Features
Wide Supply Voltage Operating Range: 2.5V to 24V
Precision Feedback Reference Voltage: 0.1V (±2%)
Analog and Digital Dimming Control
Shutdown Current: < 6µA
Internal Fixed PWM Frequency: 200KHz / FP7208
Programmable PWM Frequency: 100KHz~1000KHz / FP7208B
Programmable Soft Start Function (SS)
Programmable Over Voltage Protection (OVP)
Over Temperature Protection (OTP)
Package: SOP-8L(EP) / FP7208, DFN-10L / FP7208B
Applications
LED Module
Display Backlight
Car Lighting
Portable LED Lighting
FP7208/FP7208B
Typical Application 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.
Website: http://www.feeling-tech.com.tw
Rev. 0.60
2/15
FP7208/FP7208B
Function Block Diagram
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. 0.60
3/15
FP7208/FP7208B
Pin Descriptions
SOP-8L (EP)
Name
No.
I/O
FP7208
XXx-XXL
EN
2
I
Description
Power Supply for Internal Control Circuits and
Gate Drivers
Enable and Dimming Control
VDS
1
P
COMP
3
O
Compensation
FB
4
I
Error Amplifier Inverting Input
SS
5
I
Soft Start Programming
OVP
6
I
Over Voltage Protection
HVDD
7
P
IC Power Supply
EXT
8
O
GND
9
P
Gate Driver Output
IC Ground (Exposed PAD) – Must Connect to
Ground
Name
No.
I/O
VDS
1
P
EN
2
I
Description
Power Supply for Internal Control Circuits
and Gate Drivers
Enable and Dimming Control
COMP
3
O
Compensation
FB
4
I
Error Amplifier Inverting Input
SS
5
I
Soft Start Programming
OVP
6
I
Over Voltage Protection
RT
7
I
Frequency Programming
HVDD
8
P
IC Power Supply
GND
9
P
IC Ground
EXT
10
O
Gate Driver Output
EP
11
P
Exposed PAD – Connect to Ground
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. 0.60
4/15
FP7208/FP7208B
Marking Information
SOP-8L(EP)
DFN-10L
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. 0.60
5/15
FP7208/FP7208B
Ordering Information
Part Number
Operating Temperature
Package
FP7208XR-G1
-25°C ~ 85°C
SOP-8L(EP)
FP7208BdR-G1
-25°C ~ 85°C
DFN-10L
MOQ
Description
2500EA
Tape & Reel
2500EA
Tape & Reel
Absolute Maximum Ratings
Parameter
Supply Voltage
Symbol
Conditions
HVDD
VDS,EXT Voltage
Others Pin Voltage
Min.
Max.
Unit
0
25
V
0
16
V
0
Thermal Resistance (Junction to Ambient)
θJA
Thermal Resistance (Junction to Case)
θJC
Junction Temperature
TJ
SOP-8L (EP)
DFN-10L
SOP-8L (EP)
DFN-10L
Typ.
6
V
+60
+60
+10
+10
°C / W
°C / W
°C / W
°C / W
+150
°C
Operating Temperature
TOP
-25
+85
°C
Storage Temperature
TST
-65
+150
°C
+260
°C
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. 0.60
6/15
FP7208/FP7208B
Recommended Operating Conditions
Parameter
Symbol
Supply Voltage
Conditions
HVDD
Operating Temperature Range
TA
Ambient Temperature
Min.
Typ.
Max.
Unit
2.5
24
V
-25
+85
°C
DC Electrical Characteristics (HVDD=12V, TA=25°C , unless otherwise specified)
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Unit
24
V
System Supply Input
Input Supply Range
HVDD
Under Voltage Lockout
VUVLO
2.5
UVLO Hysteresis
Average Current
ICC
FB=0.05V, Switching
Quiescent Current
ICC
FB=0.15V, No Switching
Shutdown Current
ICC
VEN=GND
Input Supply Voltage
VDS
HVDD=12V, IDS=0A
2.2
V
0.1
V
5
mA
245
µA
6
µA
8
V
200
200
500
90
KHZ
KHZ
KHZ
%
Oscillator
Operation Frequency
fOSC
Maximum Duty Ratio
%
FP7208
RT=NC, FP7208B
RT=50KΩ, FP7208B
FB=0.05V
ISS
Vss=0V
1.5
µA
VFB
EN=Floating
EN=2.25V
0.1
0.2
V
V
Soft Start
Soft-Start bias Current
Reference Voltage
Feedback Voltage
Enable Control
Enable Voltage
VEN
Shutdown Voltage
VEN
0.25
V
0.15
V
External Transistor Connection current
EXT Pull-UP Resistance
REXTH
VDS=8V
1
Ω
EXT Pull-Down Resistance
REXTL
VDS=8V
1
Ω
VOVP
0.7
V
TTS
+150
°C
Over Voltage Protection
OVP Threshold
Thermal Shutdown
Thermal Shutdown Threshold
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. 0.60
7/15
FP7208/FP7208B
Function Description
Operation
The FP7208 and FP7208B are voltage mode boost controllers for LED driver. They operate with
pulse width modulation (PWM), and change to PSM mode when outputs are light load. The internal
resistive divider provides default 0.1V reference for the error amplifier. The maximum reference
voltage is only 0.2V, which can reduce the power dissipation in the current sense resistor.
Soft Start Function
Soft start time is programmable to connect capacitor between SS pin to ground. After the IC is
enabled, the output of error amplifier is clamped by the internal soft-start function, which causes PWM
pulse width increasing slowly and thus reducing input surge current during power on. The soft start
bias current is 1.5µA.
Oscillator
The oscillator frequency can be set from 100KHz to 1000KHz by connecting a resistance
between RT to ground. Acceptable resistance values range from 300KΩ to 20KΩ. The frequency is
200KHz when the resistance is unconnected. The relationship between the timing resistance RT and
frequency is shown in Figure 1. The oscillator frequency can be calculated using formula below.
RT(KΩ) =
25000
fOSC (KHz)
1000
900
Frequency (KHz)
800
700
600
500
400
300
200
100
0
10
100
1000
RT Resistance (KΩ)
Figure 1. Frequency vs. RT Resistance
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. 0.60
8/15
FP7208/FP7208B
Enable Mode / Shutdown Mode
Drive the EN pin to ground to shutdown the IC. Shutdown mode forces to turn off all internal
circuitry, and reduces the HVDD supply current to 6uA (max). The EN pin rising threshold is 0.25V.
The EN pin voltage is 1.25V when it is floating for automatic startup application.
DC Dimming Control
The DC voltage is connected to EN pin to adjust the feedback voltage (VFB) then LED current is
also changed. The DC voltage is valid from 0.25V to 2.25V. The feedback voltage and LED current
keep constant when the DC voltage is higher than 2.25V. The LED current (ILED) can be calculated
using formula below.
VFB =
V
VEN
ILED = FB
RS
10 ,
PWM Dimming Control
The PWM signal is connected to EN pin to adjust the feedback voltage (VFB) then LED current is
also changed. The EN pin is built-in components of filter to regulate PWM signal become a DC voltage.
The DC voltage is valid from 0.25V to 2.25V. The feedback voltage and LED current keep constant
when the DC voltage is higher than 2.25V. The PWM signal is recommended above 10KHz. The LED
current (ILED) can be calculated using formula below.
VFB =
V
VPWM × Duty
ILED = FB
RS
10
,
Over Voltage Protection
The gate driver signal is turned off when the voltage of OVP pin exceeds 0.7V. The voltage (VOVP)
can be calculated using formula below.
VOVP = 0.7V 1 +
R3
R4
Thermal Shutdown Protection
The IC will shut down automatically when the internal junction temperature exceeds +150°C. The
device can restart until the junction temperature drops below +120°C approximately.
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. 0.60
9/15
FP7208/FP7208B
Application Information
Inductor Selection
Inductance value is decided based on different condition. 4.7µH to 22uH inductance value is
recommended for general application circuit. There are three important inductor specifications, DC
resistance, saturation current and core loss. Low DC resistance has better power efficiency.
Capacitor Selection
The output capacitor is required to maintain the DC voltage during switching. Low ESR
capacitors are preferred to reduce the output voltage ripple. Ceramic capacitor of X5R and X7R are
recommended, which have low equivalent series resistance (ESR) and wider operation temperature
range.
Diode Selection
Schottky diodes with fast recovery times and low forward voltages are recommended. Ensure the
diode average and peak current rating exceed the average output current and peak inductor current. In
addition, the diode’s reverse breakdown voltage must exceed the output voltage.
LED Current Programming
The LED current is set by a resistor from the FB pin to ground. The LED current is:
ILED =
VFB
RS
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. 0.60
10/15
FP7208/FP7208B
Layout Considerations
1.
The power traces, consisting of the GND trace, the MOS drain trace and the VIN trace should
be kept short, direct and wide.
2.
Layout switching node MOS drain, inductor and schottky diode connection traces wide and short
to reduce EMI.
3.
Place C8 nearby HVDD pin as closely as possible to maintain input voltage steady and filter
noise.
4.
The sense resistor RS must be connected to FB pin directly and as closely as possible.
5.
FB is a sensitive node. Please keep it away from switching node, MOS drain.
6.
The GND of the Q1, C1, C2, C12 and C13 should be connected close and together directly to a
ground plane.
7.
The output capacitor C12 and C13 should be connected close and together directly to the ground
of Q1.
Suggested Layout
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. 0.60
11/15
FP7208/FP7208B
Application Information
L1
10µH
VIN 12V
Q1
AP0504GMT
C3
1µF
C1
100µF
C2
0.1µF
EXT
VDS
C4
33nF
C12
100µF
C13
10µF
R4
3K
RS
0.1Ω
HVDD
EN
R3
120K
R13
C15
C8
0.1µF
VLED 24V
Max. 2A
D1
SVM1045V2
FP7208
R2
3K
COMP
OVP
C6
1µF
FB
SS
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. 0.60
12/15
FP7208/FP7208B
L1
10µH
VIN 12V
Q1
AP0504GMT
VLED 24V
Max. 2A
D1
SVM1045V2
R3
120K
R13
C3
1µF
C1
100µF
C2
0.1µF
VDS
EN
C4
33nF
R2
3K
EXT
C12
100µF
GND
FP7208B
COMP
C15
C8
0.1µF
C13
10µF
R4
3K
RS
0.1Ω
HVDD
FB
RT
SS
OVP
R6
75K
C6
1µF
Note:
1.
2.
The X5R and X7R of ceramic capacitors are recommended to choose.
R13 and C15 are added for reducing EMI (Electromagnetic Interference).
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. 0.60
13/15
FP7208/FP7208B
Package Outline
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
1.94
2.29
D1
1.94
2.29
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.
Website: http://www.feeling-tech.com.tw
Rev. 0.60
14/15
FP7208/FP7208B
DFN-10L
m
Symbols
Min. (mm)
Max. (mm)
A
0.700
0.800
A1
0.000
0.050
A3
b
0.20REF
0.180
0.300
D
3.00
E
3.00
D2
2.200
2.700
E2
1.400
1.750
e
0.500
L
0.300
0.500
K
0.200
-
Unit: mm
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. 0.60
15/15
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