FP6737S9P [FITIPOWER]
Built-In OVP White LED Step-Up Converter in Tiny Package;
| 型号： | FP6737S9P |
| 厂家： | 
Fitipower |
| 描述： | Built-In OVP White LED Step-Up Converter in Tiny Package |
| 文件： | 总12页 (文件大小：541K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
fitipower integrated technology lnc.
Built-In OVP White LED Step-Up
Converter in Tiny Package
Description
Features
The FP6737/A is a step-up DC/DC converter
specifically designed to drive white LEDs with a
constant current. The device can drive two to
seven LEDs in series from a Li-Ion cell. Series
connection of the LEDs provides identical LED
current resulting in uniform brightness and
eliminating the need for ballast resistors. The
FP6737/A switches at 1.2MHz, allowing the use of
tiny external components. The output capacitor can
be as small as 0.22μF for saving space and cost
versus alternative solutions. A low 250mV/104mV
feedback voltage minimizes power loss in the current
setting resistor for better efficiency.
● Inherently Matched LED Current
● High Efficiency: 87%
● Drives up to Seven LEDs from a 3.2V Supply
● 33V Internal Switch
● Fast 1.2MHz Switching Frequency
● Use Tiny 1mm Tall Inductors
● Need only 0.22µF Output Capacitor
● Low Profile SOT-23-6 and TSOT-23-6 Packages
● Built-In Open Circuit Protection
● Over Voltage Protection
● RoHS Compliant
Applications
● Cellular Phone
● Digital Camera
● MP3 Player
The FP6737/A is available in low profile SOT-23-6
and TSOT-23-6 packages.
● GPS Receiver
● PDA, Handheld Computer
Pin Assignments
S6 Package (SOT-23-6)
VIN OVPSHDN
Ordering Information
FP6737□□□□
TR: Tape / Reel
Blank: Tube
P: Green
G: Green
6
1
5
4
3
(Marking)
2
Package Type
S6: SOT-23-6
S9: TSOT-23-6
SW GND FB
S9 Package (TSOT-23-6)
VIN OVPSHDN
FB Voltage
Blank: 250mV
A: 104mV
SOT-23-6 Marking
Part Number
Product Code
6
1
5
4
3
(Marking)
FP6737S6P
C4
2
FP6737AS6G
aV=
TSOT-23-6 Marking
Part Number
SW GND FB
Product Code
Figure 1. Pin Assignment of FP6737/A
FP6737S9P
C1
FP6737AS9G
aW=
FP6737/A-1.6-DEC-2011
1
fitipower integrated technology lnc.
Typical Application Circuit
VOUT
L1
D1
VIN
10µH
LED 1
COUT
CIN
0.22µF
1µF
LED 2
LED 3
LED 4
LED 5
LED 6
1
2
3
6
5
4
SW
VIN
FP6737/A
GND
OVP
FB
SHDN
R1
Figure 2. Typical Application Circuit of FP6737/A
Functional Pin Description
Pin Name
Pin Function
SW
GND
FB
Switch Pin. Connect inductor/diode here. Minimize trace area at this node to reduce EMI.
Ground Pin. Connect to local ground plane directly.
Feedback Pin. Connect cathode of the lowest LED and resistor here. Calculate resistor value according to the
formula: RFB=VFB/ILED
Shutdown Pin. Force 1.5V or higher voltage to enable the device; force 0.4V or lower voltage to disable the
device.
ꢀꢁꢂ
Over-Voltage Protection Sensing Input Pin. The function will be triggered when the trip point reaches 28V.
Leave it unconnected to disable this function.
OVP
VIN
Input Supply Pin. Must be locally bypassed.
FP6737/A-1.6-DEC-2011
2
fitipower integrated technology lnc.
Block Diagram
OVER VOLTAGE
COMPARATOR
SHDN
SW
PWM/PFM
CONTROL
28V
OVP
VIN
VREF
DRIVER
PWM
COMPARATOR
M1
CONTROL
LOGIC
ERROR
AMP.
FB
SLOPE
1.2MHz
COMPENSATION
OSCILLATOR
RC
CURRENT AMP.
CC
RS
Internal
Soft Start
GND
Figure 3. Block Diagram of FP6737/A
Absolute Maximum Ratings
● Supply Input Voltage (VIN) ------------------------------------------------------------------------------------- +6V
● SW, OVP Voltage ------------------------------------------------------------------------------------------------- +33V
● FB Voltage ---------------------------------------------------------------------------------------------------------- +6V
+6V
● ꢀꢁꢂ Voltage ----------------------------------------------------------------------------------------------------
● Power Dissipation @TA=25ºC, SOT-23-6/TSOT-23-6 (PD) -------------------------------------------- +0.4W
● Package Thermal Resistance SOT-23-6/TSOT-23-6 (θJA) --------------------------------------------- +250ºC/W
● Maximum Junction Temperature (TJ) ------------------------------------------------------------------------ +150ºC
● Storage Temperature Range (TS) ----------------------------------------------------------------------------- -65ºC to +150ºC
● Lead Temperature (Soldering, 10 sec.) (TLEAD) ------------------------------------------------------------ +260ºC
Note 1： tressesꢃbeyondꢃthoseꢃlistedꢃunderꢃ“AbsoluteꢃMaximumꢃRatings"ꢃmayꢃcause permanent damage to the device.
Recommended Operating Conditions
● Input Voltage (VIN) ------------------------------------------------------------------------------------------------ +2.5V to +5.5V
● Operating Temperature Range -------------------------------------------------------------------------------- -40ºC to +85ºC
FP6737/A-1.6-DEC-2011
3
fitipower integrated technology lnc.
Electrical Characteristics
(VIN=3V, ꢄ ꢀꢁꢂ=3V, TA=25ºC, unless otherwise specified)
Parameter
Symbol
Conditions
Min
Typ
Max
5.5
1.5
100
1
Unit
V
Input Voltage Range
VIN
2.5
Switching
Non switching
ꢀꢁꢂ=0V
0.7
50
mA
Supply Current
IIN
μA
ꢄ
0.1
ERROR AMPLIFIER
FP6737
237
94
250
104
1
263
114
Feedback Voltage
VFB
mV
nA
FP6737A
VFB=250mV
FB Input Bias Current
OSCILLATOR
IFB
Switching Frequency
Maximum Duty Cycle
POWER SWITCH
fOSC
D
0.9
85
1.2
90
1.5
MHz
%
Switch Current Limit (Note 2)
Switch On Resistance
Switch Leakage Current
CONTROL INPUT
ILIM
350
1
mA
RDS(ON)
ISW(OFF)
5
1
VSW=33V
0.1
μA
VIH
VIL
ON
1.5
V
V
ꢀꢁꢂ Voltage High
OFF
0.4
31
ꢀꢁꢂ Voltage Low
OVER VOLTAGE PROTECTION
OVP Input Resistance (Note 2)
OVP Threshold
ROVP
VOVP
1.2
28
M
1V Hysteresis typical
25
V
Note 2：Guarantee by design.
FP6737/A-1.6-DEC-2011
4
fitipower integrated technology lnc.
Typical Performance Curves
1.6
1.4
1.2
1.0
0.8
0.6
0.4
60
58
56
54
52
50
48
46
44
42
40
FB=GND
Switching
FB=VIN
Non_Switching
2.5
3.0
3.5
4.0
4.5
5.0
5.5
2.5
3.0
3.5
4.0
4.5
5.0
5.5
Supply Voltage(V)
Supply Voltage(V)
Figure 4.Supply Current vs. Supply Voltage
Figure 5.Supply Current vs. Supply Voltage
1.40
1.35
1.30
1.25
1.20
1.15
1.10
1.05
1.00
258
255
252
249
246
243
240
2.5
3.0
3.5
4.0
4.5
5.0
5.5
2.5
3.0
3.5
4.0
4.5
5.0
5.5
Supply voltage(V)
Supply Voltage(V)
Figure 6. Switching Frequency vs. Supply Voltage
Figure 7. Feedback Voltage vs. Supply Voltage
1.30
1.25
1.20
1.15
1.10
1.05
1.00
97
96
95
94
93
92
2.5
3.0
3.5
4.0
4.5
5.0
5.5
-40 -30 -20 -10
0
10 20 30 40 50 60 70 80 90 100 110 120
Supply Voltage(V)
Temperature(0C)
Figure 8. Maximum Duty vs. Supply Voltage
Figure 9. Switching Frequency vs. Temperature
FP6737/A-1.6-DEC-2011
5
fitipower integrated technology lnc.
Typical Performance Curves (Continued)
1.0
252
250
248
246
244
1KHZ
4WLED
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
VIN=3.6V
500HZ
L=22uH
CIN=1uF,Co=1uF
200HZ
100HZ
20
30
40
50
60
70
80
-40
-20
0
20
40
60
80
100
120
Temperature(0C)
SHDN PIN PWM Duty(%)
Figure 10. Feedback Voltage vs. Temperature
Figure 11. Dimming Control by Shutdown PIN
200
92
6WLEDs
L=22uH
CIN=1uF,Co=1uF
VIN=3.6V, L=22uH, D=SS14
90
180
160
140
120
100
80
88
3LEDs
86
84
82
80
78
76
74
72
4LEDs
6LEDs
60
40
20
0
2.5
3.0
3.5 4.5
Supply Voltage (V)
4.0
5.0
5.5
5
10
15
20
LED current (mA)
Figure 12. Efficiency vs. LED Current
Figure 13. Feedback Voltage vs. Supply Voltage
200
VIN=3.6V
180
160
140
120
100
80
VO (ch1), 5V/Div
4WLEDs, VIN=3.0V
6WLEDs
L=22uH
CIN=1uF,Co=1uF
ILED=20mA, L=10μꢀ
VIN (ch3), 2V/Div
VSW(ch2),10V/Div
60
40
20
IL (ch4),100mA/Div
0
-40 -20
0
20
40
60
80
100
Temperature (oC)
Figure 14. Feedback Voltage vs. Temperature
Figure 15. Operation Waveform
FP6737/A-1.6-DEC-2011
6
fitipower integrated technology lnc.
Typical Performance Curves (Continued)
VO (ch1), 5V/Div
Vo (ch1), 5V/Div
VIN (ch3), 2V/Div
ILED=20mA, L=10μꢀ
VIN (ch3), 2V/Div
ILED=20mA, L=10μꢀ
4WLEDs, VIN=5.5V
4WLEDs, VIN=4.3V
VSW (ch2), 10V/Div
VSW (ch2), 10V/Div
IL (ch4), 100mA/Div
IL (ch4),100mA/Div
Figure 16. Operation Waveform
Figure 17. Operation Waveform
VSW (ch1)
VSW (ch1)
ILED=20mA, L=22H
6WLEDs, VIN=3.6V
CIN=1µ, CO=0.22µ
IL (ch4)
IL (ch4)
ILED=20mA, L=22H
VOUT (ch2)
6WLEDs, VIN=3.6V
CIN=1µ, CO=0.22µ
VOUT (ch2)
VFB (ch3)
VFB (ch3)
Figure 18. Operation Waveform
Figure 19. Operation Waveform
FP6737/A-1.6-DEC-2011
7
fitipower integrated technology lnc.
Application Information
Inductor Selection
Over Voltage Protection
A 10μꢀꢃinductorꢃisꢃrecommendedꢃforꢃmostꢃFP6737/A
The FP6737/A has an internal open-lamp protection
circuit. In the cases of output open circuit, when
the LEDs are disconnected from the circuit or the
LEDs fail open circuit, the over-voltage function will
monitor the output voltage through SW pin to
protect the converter against. The LED strings
open will cause N-MOS to switch with a maximum
duty cycle and come out output over-voltage. This
may cause the SW voltage exceeds its maximum
rating then damages built-in N-MOS. In the state,
the OVP protection circuitry will be triggered if
output voltage exceeds 25V (min.). The FP6737/A
applications.
Although small size and high
efficiency are major concerns, the inductor should
have low core losses at 1.2MHz and low DCR
(copper wire resistance).
Capacitor Selection
The small size of ceramic capacitors makes them
ideal for FP6737/A applications. X5R and X7R
types are recommended because they retain their
capacitance over wider voltage and temperature
ranges better than other types such as Y5V or Z5U.
Aꢃ1μFꢃinputꢃcapacitorꢃandꢃaꢃ0.47μFꢃoutputꢃcapacitorꢃ
are sufficient for most FP6737/A applications.
will then stop switching.
The FP6737/A will
automatically recover normal operation until SW is
under 24V (1V hysteresis).
Diode Selection
The Schottky diodes, with their low forward voltage
drop and fast reverse recovery, are the ideal choices
for FP6737/A applications. The forward voltage
drop of a Schottky diode represents the conduction
losses in the diode while the diode capacitance (CT
or CD) represents the switching losses. For diode
selection, both forward voltage drop and diode
L
D
4.7μH
VIN
CIN
1uF
COUT
0.22uF
VIN
SW
OVP
FP6737/A
capacitance need to be considered.
Schottky
diodes with higher current ratings usually have lower
forward voltage drop and larger diode capacitance,
which can cause significant switching losses at the
FB
SHDN
R1
10Ω
GND
PGND
1MHz switching frequency of the FP6737/A.
A
Schottky diode rated at 100mA to 400mA is sufficient
for most FP6737/A applications.
Figure 20. LED Driver with Open-Circuit Protection
LED Current Control
Dimming Control
The LED current is controlled by the feedback
resistor (R1 in Figure 20). The FP6737 feedback
reference is 250mV and the FP6737A feedback
reference is 104mV. The LED current is VFB/R1.
In order to have accurate LED current, precision
resistors are preferred (1% is recommended). The
formula and table for R1 selection are shown as
below.
The LED current can be modulated by a DC
voltage, PWM signal or a filtered PWM signal.
(1) Using a PWM Signal
With the PWM signal applied to the ꢀꢁꢂ pin, the
FP6737/A is turned on or off by the PWM signal.
The LEDs operate at either zero or full current.
The average LED current increases proportionally
with the duty cycle of the PWM signal. A 0% duty
cycle will turn off the FP6737/A and corresponds to
zero LED current. A 100% duty cycle corresponds
to full current. The typical frequency range of the
PWM signal is 200Hz to 5kHz. The magnitude of
the PWM signal should be higher than the minimum
Feedback Reference
Voltage VFB(V)
LED Current
Setting ILED(A)
Version
FP6737
0.25
0.25/R1
FP6737A
0.104
0.104/R1
ꢀꢁꢂ voltage.
Table 1. R1 Resistor Value Selection
FP6737/A-1.6-DEC-2011
8
fitipower integrated technology lnc.
Application Information (Continued)
(2) Using a DC Voltage
Start-up and Inrush Current
For some applications, the preferred method of
brightness control is a variable DC voltage to adjust
the LED current. The dimming control using a DC
voltage is shown in Figure 21. As the DC voltage
increases, the voltage drop on R2 increases and
the voltage drop on R1 decreases. Thus, the LED
current decreases. The selection of R2 and R3
will make the current from the variable DC source
much smaller than the LED current and much
larger than the FB pin bias current. For FP6737,
the VDC ranges from 1.75V to 2.75V, and for
FP6737A, the VDC ranges from 0.144V to 1.144V,
the selection of resistors in Figure 21 gives
dimming control of LED current from 0mA to 20mA.
To achieve minimum start-up delay, no internal
soft-start circuit is included in FP6737/A. When
first turned on without an external soft-start circuit,
inrush current is about 200mA. If soft-start is
desired, the recommended circuit is shown in
Figure 24. If both soft-start and dimming are
used, a 5kHz PWM signal on ꢀꢁꢂ is not
recommended.
Use a lower frequency or
implement dimming through the FB pin as shown
in Figures 21, 22 or 23
FP6737/A
FB
VDC (FP6737)
ILED
R3
R2
5k
10k
1.75V
2.25V
2.75V
20mA
10mA
0mA
50K
PWM
R1
0.1uF
5Ω
Table 2. DC Voltage vs. LED Current
VDC
(FP6737A)
Figure 22. Dimming Control Using a Filtered PWM
Signal
ILED
0.144V
0.644V
1.144V
20mA
10mA
0mA
FP6737/A
Table 3. DC Voltage vs. LED Current
FB
FP6737/A
RSET
FB
Logic
R1
Signal
R3
50k
R2
5k
VDC
R1
5Ω
Figure 23. Dimming Control Using a Logic Signal
D1
Figure 21. Dimming Control Using a DC Voltage
2.2nF
D2
(3) Using a Filtered PWM Signal
The filtered PWM signal can be considered as an
adjustable DC voltage. It can be used to replace
the variable DC voltage source in dimming control.
The circuit is shown in Figure 22.
R2
FP6737/A
COUT
1k
FB
R1
5k
15Ω
(4) Using a Logic Signal
D2:MMBT
For applications which need to adjust the LED
current in discrete steps, a logic signal can be used
as shown in Figure 23. R1 sets the minimum LED
current (when the NMOS is off). RSET sets how
much the LED current increases when the NMOS
is turned on.
Figure 24. Recommended Soft-Startup Circuit
FP6737/A-1.6-DEC-2011
9
fitipower integrated technology lnc.
Demo Board Circuit & Layout
SOT-23-6 Package
VOUT
VIN
D1
LED1
L1
10uH
FP6737/A
U1
R6
18K
R1
10 ohm
1
2
3
6
5
4
SW
VIN
OVP
EN
LED2
LED3
LED4
GND
FB
LED7
R5
0
C3
C2
C1
1uF
1uF
1uF
C4
C5
R4
6.34 ohm
0.22uF 0.22uF
LED6
LED5
Enable
Top Side (SOT-23-6 Package)
Bottom Side (SOT-23-6 Package)
Component Placement(SOT-23-6 Package)
FP6737/A-1.6-DEC-2011
10
fitipower integrated technology lnc.
Outline Information
SOT-23-6 Package (Unit: mm)
DIMENSION IN MILLIMETER
SYMBOLS
UNIT
MIN
MAX
A
A1
A2
B
0.90
1.45
0.00
0.90
0.30
2.80
2.60
1.50
0.90
1.80
0.30
0.15
1.30
0.50
3.00
3.00
1.70
1.00
2.00
0.60
D
E
E1
e
e1
L
Note：Followed From JEDEC MO-178-C.
Carrier dimensions
FP6737/A-1.6-DEC-2011
11
fitipower integrated technology lnc.
Outline Information (Continued)
TSOT-23-6 Package (Unit: mm)
DIMENSION IN MILLIMETER
SYMBOLS
UNIT
MIN
MAX
A
A1
A2
B
0.70
1.10
0.00
0.70
0.30
2.80
2.60
1.50
0.90
1.80
0.30
0.10
1.00
0.50
3.00
3.00
1.70
1.00
2.00
0.60
D
E
E1
e
e1
L
Carrier dimensions
Life Support Policy
Fitipower’s products are not authorized for use as critical components in life support devices or other medical systems.
FP6737/A-1.6-DEC-2011
12
相关型号：
SI9130DB
5- and 3.3-V Step-Down Synchronous ConvertersWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
SI9135LG-T1
SMBus Multi-Output Power-Supply ControllerWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
SI9135LG-T1-E3
SMBus Multi-Output Power-Supply ControllerWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
SI9135_11
SMBus Multi-Output Power-Supply ControllerWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
SI9136_11
Multi-Output Power-Supply ControllerWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
SI9130CG-T1-E3
Pin-Programmable Dual Controller - Portable PCsWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
SI9130LG-T1-E3
Pin-Programmable Dual Controller - Portable PCsWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
SI9130_11
Pin-Programmable Dual Controller - Portable PCsWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
SI9137
Multi-Output, Sequence Selectable Power-Supply Controller for Mobile ApplicationsWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
SI9137DB
Multi-Output, Sequence Selectable Power-Supply Controller for Mobile ApplicationsWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
SI9137LG
Multi-Output, Sequence Selectable Power-Supply Controller for Mobile ApplicationsWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
SI9122E
500-kHz Half-Bridge DC/DC Controller with Integrated Secondary Synchronous Rectification DriversWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
©2020 ICPDF网 联系我们和版权申明