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PDF FP7201 Data sheet ( Hoja de datos )
| Número de pieza | FP7201 | |
| Descripción | Constant Current Switching Regulator | |
| Fabricantes | Feeling Technology | |
| Logotipo |  |
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FP7201
Constant Current Switching Regulator for White LED
General Description
The FP7201 is a Boost DC-DC converter specifically designed to drive white LEDs with constant
current. The device can support 2 to 7 white LEDs for backlighting and camera flashing. This high
efficient regulator and internal compensation network minimizes as 5 external component counts.
Optimized operation frequency can meet the requirement of small LC filters value and low operation
current with high efficiency. The non-inverting input of error amplifier connects to a 0.25V precision
reference voltage and internal soft-start function can reduce the inrush current.
The FP7201 is available in the TSOT23-6L package and provides space-saving PCB for diverse
application fields.
Features
Precision Feedback Reference Voltage: 0.25V (4%)
Under Voltage Lockout Protection
Over Voltage Protection
Over Temperature Protection
Wide Frequency Range and Dimming with Zero-Inrush Current
Internal Soft-Start
Zero Shutdown Current
Adjustable Output up to 26V
Package: TSOT23-6L
Applications
Smart Phone LED Backlights
Digital Cameras
Camcorders
PDA LED Backlights
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. 0.70
1/14
1 page  
FP7201
Recommended Operating Conditions
Parameter
Symbol
Conditions
Junction Temperature Range
Ambient Temperature Range
Min.
-40
-40
Typ.
Max.
+125
+85
DC Electrical Characteristics (VCC=3.7V, TA=25° ,unless otherwise specified)
Parameter
Symbol
Conditions
Min. Typ. Max.
System Supply Input
Input Supply Range
Under Voltage Lockout
Quiescent Current
Average Supply Current
Shutdown Supply Current
VCC
VUVLO
ICC
ICC
ICC
VFB=0.3V, No switching
VFB=0V, Switching
VEN=GND
2.7 5.5
2.2
0.3
0.5
0.1
Oscillator
Operation Frequency
Frequency Change with Voltage
Frequency Change with
Temperature
Maximum Duty Cycle
FOSC VFB=1.0V
△f / △V VCC=2.7V to 5.5V
△f / △T TA=-40°C to 85°C
TDUTY
0.9 1.2 1.5
2
10
85
Reference Voltage
Feedback Voltage
VREF
0.24 0.25 0.26
Feedback Voltage Change with
Temperature
Line Regulation
TA=-40°C to 25°C
△VREF / △T
TA=25°C to 85°C
VCC=2.7V～5.5V
1.5
1.5
0.01
MOSFET
On Resistance of Driver
RDS (ON) ILX=0.1A
0.75
Protection
OVP Threshold Voltage
OVP Sink Current
OCP Current
OTP Temperature
VOVP
ISINK
IOCP
TOTP
27
5
750
+150
Enable Voltage
VEN
1.5
Shutdown Voltage
VEN
0.4
Unit
°C
°C
Unit
V
V
mA
mA
µA
MHZ
%
%
%
V
%
%/V
Ω
V
µA
mA
°C
V
V
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. 0.70
5/14
5 Page 
FP7201
Setting the LED Current
Feedback resistance R1 decides the LED current. The current through LEDs is equal to 0.25V /
R1. The following table shows the selection of R1 for different LED current.
ILED vs. R1
ILED (mA)
1
5
10
15
20
R1 (Ω)
250
50
25
16.6
12.5
Dimming Control
Dimming control can adjust LED brightness. There are three ways to control LED current for the
FP7201, as shown in the following.
a. Using the PWM Signal to EN Pin
The first way uses the PWM signal to control the Enable pin for regulating LED brightness. The
LED current is between the full load to complete shutoff, and the average LED current is proportional to
the PWM signal duty cycle. In addition, the PWM signal frequency should be larger than 2kHz.
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. 0.70
11/14
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet FP7201.PDF ] | |
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