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PT4110ESOP 데이터시트 PDF




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부품번호 PT4110ESOP 기능
기능 High Efficiency White LED Driver
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PT4110ESOP 데이터시트, 핀배열, 회로
PT4110
High Efficiency White LED Driver
GENERAL DESCRIPTION
The PT4110 is a high efficiency step-up DC/DC
converter designed for driving multiple strings of up to
eight series-connected white LED from a single cell
Lithium Ion battery. It regulates the output current,
ideal for driving light emitting diodes (LED) whose
light intensity is proportional to the current passing
through them. The external ballast resistor sets the LED
current ranging from 5mA to 20mA, which can be
easily adjusted using either a DC voltage or a pulse
width modulated (PWM) signal alternatively. Its low
300mV feedback voltage reduces power loss and
improves efficiency.
The PT4110 has multiple features to protect itself from
fault conditions including built-in open load protection,
cycle-by-cycle current limit, over temperature
shutdown, input under voltage control and integrated
soft-start.
The PT4110 is available in SOT-89-5 and SOP-8
packages.
FEATURES
z 2.7V to 5.5V Input Voltage Range
z 35V Maximum Step-Up Voltage
z <1µA Shutdown Mode
z 1.2MHz Fixed Frequency Operation
z Cycle-By-Cycle Current Limit
z Open Load Protection
z Under Voltage Lockout
z Integrated Soft-Start
z Thermal Shutdown
z Frequency Jittering for better EMI performance
z SOT89-5 or SOP8 package
APPLICATIONS
z White LED Power Suppliers
z Flat Screen LCD Bias Suppliers
z Portable Media Players
z GPSs
z General middle-sized LCD backlight
ORDERING INFORMATION
PACKAGE
TEMPERATURE ORDERING PART
RANGE
NUMBER
SOT89-5, Pb free
-40to 85
PT4110E89E
SOP8, Pb free
-40to 85
PT4110ESOP
Note:
xxxxxX
Assembly Factory Code
Lot Number
TRANSPORT
MEDIA
Tape and Reel
Tape and Reel
MARKING
PT4110
xxxxxX
PT4110
xxxxxX
TYPICAL APPLICATION CIRCUIT
China Resources Powtech (Shanghai) Limited
PT4110_DS Rev EN_1.3
WWW.CRPOWTECH.COM
Page 1




PT4110ESOP pdf, 반도체, 판매, 대치품
SIMPLIFIED BLOCK DIAGRAM
PT4110
High Efficiency White LED Driver
OPERATION DESCRIPTION
The PT4110 uses a constant frequency, peak current
mode boost regulator architecture to regulate the series
string of white LED. The operation of the PT4110 can
be understood by referring to the block diagram. At the
start of each oscillator cycle the power MOSFET, M1,
is turned on through the control circuitry. To prevent
sub-harmonic oscillations at duty cycles greater than 50
percent, a stabilizing ramp is added to the output of the
current sense amplifier and the result is fed into the
positive input of the PWM comparator. When this
voltage equals the output voltage of the error amplifier
the power MOSFET is turned off. The voltage at the
output of the error amplifier is an amplified version of
the difference between the 300mV reference voltage
and the feedback voltage. In this way the peak current
level keeps the output in regulation. If the feedback
voltage starts to drop, the output of the error amplifier
increases. This results in more current flowing through
the power MOSFET, thus increasing the power
delivered to the output.
The PT4110 can be used to drive multiple strings of
white LED as shown in figure “typical application”.
The brightness of each LED in such kind of connection
will almost be the same provided that the number of
series-connected LED in each string is equal and each
string is terminated with a well-matched ballast resistor.
Otherwise the differential current among strings will be
huge enough to cause damage to LED permanently.
To protect the step-up converter when the load is open,
or the output voltage becomes excessive for any reason,
the PT4110 features a dedicated open LED protection.
When the output is in open circuit, and the input
voltage exceeds 4.5V, the step-up converter switches
off immediately and won’t be enabled until restart chip.
TYPICAL PERFORMANCE CHARACTERISTICS
Efficiency w/Io and Vin
0.90
0.88
0.86 Vin=5.0V
0.84
0.82
0.80 Vin=3.6V
0.78
0.76
0.74
0.72
0 20 40 60 80 100 120 140 160 180 200 220 240 260 280
Iout (mA)
Iout By PWM Dimming
80
70
60
50
40
30
20 100Hz
10
20KHz
50KHz
0
1% 10% 20% 30% 40% 50% 60% 70% 80% 90% 99%
Duty Cycle
China Resources Powtech (Shanghai) Limited
PT4110_DS Rev EN_1.3
WWW.CRPOWTECH.COM
Page 4

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PT4110ESOP 전자부품, 판매, 대치품
PACKAGE INFORMATION
D
D1
PT4110
High Efficiency White LED Driver
SOT89-5
A
b1
e
e1
b
c
SYMBOL
A
b
b1
c
D
D1
E
E1
e
e1
L
MILLIMETERS
MIN
1.400
0.320
0.360
MAX
1.600
0.520
0.560
0.350
0.440
4.400
4.600
1.400.
1.800
2.300
2.600
3.940
4.250
1.500 TYP.
2.900
3.100
0.900
1.100
INCHES
MIN
0.055
0.013
0.014
MAX
0.063
0.020
0.022
0.014
0.017
0.173
0.181
0.055
0.071
0.091
0.102
0.155
0.167
0.060 TYP.
0.114
0.122
0.035
0.043
China Resources Powtech (Shanghai) Limited
PT4110_DS Rev EN_1.3
WWW.CRPOWTECH.COM
Page 7

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PT4110ESOP

High Efficiency White LED Driver

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