L5107G-P16-T [UTC]
CONSTANT CUTTENT BOOST CONTROLLER FOR DRIVING HIGH POWER LEDS;
| 型号： | L5107G-P16-T |
| 厂家： | 
Unisonic Technologies |
| 描述： | CONSTANT CUTTENT BOOST CONTROLLER FOR DRIVING HIGH POWER LEDS 高功率电源 |
| 文件： | 总9页 (文件大小：229K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
UNISONIC TECHNOLOGIES CO., LTD
L5107
Preliminary
LINEAR INTEGRATED CIRCUIT
CONSTANT CUTTENT BOOST
CONTROLLER FOR DRIVING
HIGH POWER LEDS
DESCRIPTION
The UTC L5107 is a high powered PWM boost converter
optimized for constant current applications such as driving one or
more strings of high power LEDs. The powerful drive circuitry can
deliver up to 70W to the LED system.
The output current can be set by an external resistor
connected the IADJ pin and GND. This average current can be
reduced by applying a PWM signal to the PWMD pin. The UTC
L5107 offers a dither feature to reduce EMI.
The UTC L5107 has a large input voltage range from 6V to
45V and the switching frequency can be set by an external
resistor between 100kHz and 1MHz for diffident LED systems. To
protect the device over voltage protection circuit and under
voltage lock-out circuit have been incorporated as well as thermal
shutdown circuit.
The UTC L5107 is available in the HTSSOP 16-pin TSSOP
package.
FEATURES
* Input voltage range: 6V~45V
* Feedback voltage: 0.25V±3%
* Maximum out power of 70W
* Programmable switching frequency and LED drive current
* Ultra low EMI via dithering on the UTC L5107
* Single pin for PWM dimming
* Protection circuit:
Over voltage protection circuit
Over temperature protection circuit
Under-voltage Lock-out circuit
* Accurate over the -40~125°C temperature range
ORDERING INFORMATION
Ordering Number
Package
Packing
Lead Free
Halogen Free
L5107L-P16-T
L5107L-P16-R
L5107G-P16-T
L5107G-P16-R
TSSOP-16
TSSOP-16
Tube
Tape Reel
Note: xx: Output Voltage, refer to Marking Information.
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Copyright © 2013 Unisonic Technologies Co., Ltd
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L5107
Preliminary
LINEAR INTEGRATED CIRCUIT
PIN CONFIGURATION
PIN DESCRIPTION
PIN NO.
PIN NAME
NC
DESCRIPTION
1
No Connection.
Power Input Pin. The external voltage supply is connected to this pin. A 4.7µF/50V
capacitor must be connected across this pin and GND.
Enable Control Pin. Pull high to turn on. A 100kΩ resistor can be connected across this
pin and VIN.
2
VIN
EN
3
4
Dimming PWM Control Pin. Logic High terminates the output power. Logic Low starts
up the output power.
PWMD
Error Amp Output Pin. A 10nF capacitor must be connected across this pin and GND
for external compensation.
5
6
7
COMP
IADJ
FS
Output Feedback Pin. The reference is 0.25V.
Timing Resistance Connection Pin. Connected to a Resistor to determine the operating
frequency.
8
9
AGND
NC
Analog Ground.
No Connection.
Frequency Synchronize Pin. The UTC L5107 can be Connected together by this pin to
synchronize multiple converters.
10
SYNC
Current Sense Pin. Connected to external current sense resistor which in turn is
connected to the source of the external FET as well as an external slope compensation
resistor.
11
IS
OVP Divider Connect Pin. Connect the top of the divider string to the output. If the load
is disconnected, the output voltage will rise until OVP reaches 1.25V and then will
regulate around this point.
12
OVP
13
14
PGND
DRV
Power Ground.
Drive Output. Connect to the gate of external FET.
VDD Filter Connect Pin. Connect a 10μF/10V capacitor to GND. It is also the positive
supply for the Driver. Do not connect an external load to this pin.
No Connect.
15
16
VDD
NC
EPAD
Connect to AGND.
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L5107
Preliminary
LINEAR INTEGRATED CIRCUIT
BLOCK DIAGRAM
VIN
L1
D1
LED0
LED1
CIN
COUT
LDO
VDD
VIN
EN
ENABLE
Q1
DRV
DRV
PGND
PWND
LED2
RADJ
PWMcontrol
1.2V
OVP
OVP
COMP
CCOMP
IADJ
FS
RSCL
IS
Err
OSC
RAMP
0.25V
RCS
OSC/RAMP
SYNC
RFS
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L5107
Preliminary
LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATING(Note 1)
PARAMETER
SYMBOL
VIN
RATINGS
+48
UNIT
V
Supply Voltage
Enable Pin Voltage
IADJ Voltage
VEN
-0.3~+6
+6
V
VADJ
TS
V
Storage Temperature
-65~+150
°C
Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not implied.
THERMAL DATA(Note 3)
PARAMETER
Junction Thermal Resistance
PACKAGE
SYMBOL
RATINGS
36.5
UNIT
θJA
°С/W
OPERATING RATINGS(Note 3)
PARAMETER
SYMBOL
RATINGS
+6~+45
UNIT
V
Supply Voltage
VIN
TJ
Junction Temperature
-40~+125
°C
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L5107
Preliminary
LINEAR INTEGRATED CIRCUIT
ELECTRICAL CHARACTERISTICS(Note 4)
(VIN=12V, VEN=3.6V, L=47µH, C=4.7µF, TJ=25°C, Bold values indicate -40°C≤TJ≤+125°C, unless noted)
PARAMETER
Supply Voltage Range
Under Voltage Lockout
SYMBOL
VIN
TEST CONDITIONS
MIN
6
TYP
MAX UNIT
45
V
V
UVLO
3.5
4.9
3.2
5.5
VFB>275mV (to ensure device is not
switching)
Quiescent Current
IVIN
ISD
10
mA
Shutdown Current
VEN=0V
30
250
250
1.2
2
μA
mV
mV
μA
%
Room temperature (3%)
-40°C≤TJ≤+125°C (5%)
VFB=250mV
242.5
237.5
257.5
262.5
3
Feedback Voltage (at IADJ)
VIADJ
Feedback Input Current
Line Regulation
IADJ
SV
VIN=12V~24V
Load Regulation
SI
VOUT to 2×VOUT
2
%
Maximum Duty Cycle
DMAX
88
%
Turn ON
1.15
1.1
1.5
Enable Threshold
VEN
IEN
V
μA
V
Turn OFF
0.4
Enable Pin Current
PWMD Threshold
VEN=3.3V, REN=100kΩ
Turn ON
17
30
0.75
0.7
1.5
VPWM
fPWMD
Turn OFF
0.4
0
PWMD Frequency Range
L=47μH, C=4.7μF (Note 5)
REREQ=82.5kΩ
REREQ=21kΩ
500
440
Hz
109
400
950
±12
Programmable Oscillator
Frequency
fSW
360
kHz
REREQ=8.25kΩ
Low EMI
FDITHER Frequency dither shift from nominal
%
V
Current Limit Threshold Voltage
ISENSE Peak Current Out
Over Voltage Protection
VSENS
ISENSE
VOVP
RSENSE=390Ω
RSENSE=390Ω
0.315 0.45 0.585
250
μA
V
1.203 1.24 1.277
Sink
2.4
2
3.5
Driver Impedance
RON
VDRH
TJ
Ω
V
Source
VIN=12V
Driver Voltage High
Over-Temperature Threshold
Shutdown
7
9
11
150
5
°C
°C
Thermal Shutdown
TH
Hysteresis
Notes: 1. Exceeding the absolute maximum rating may damage the device.
2. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5kΩ in series with
100pF.
3. The device is not guaranteed to function outside its operating rating.
4. Specification for packaged product only.
5. Guaranteed by design
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L5107
Preliminary
LINEAR INTEGRATED CIRCUIT
FUNCTIONAL DESCRIPTIOM
The UTC L5107 DC-DC converter is based on a peak current mode PWM architecture which regulates the
feedback voltage at 0.25V under normal operating conditions. The constant output current converter is the preferred
method for driving LEDs. Figure 2 shows the typical application schematic.
The UTC L5107 configured as a boost controller can allow for the design of multiple LEDs in series to help
maintain color and brightness.
The input voltage range of the UTC L5107 is very wide, from 6V to 45V. In addition, the LED current and the
switching frequency can be programmed to a wide range of values through the external resistors for diffident LED
systems. The UTC L5107 can also control the brightness of the LEDs through its PWMD pin.
POWER TOPOLOGY
Constant Output Current Controller
The UTC L5107 as a peak current mode boost controller has been designed to provide a constant output current.
In the boost configuration, the output can be set from VIN up to 100V.
This LED driver features a built-in soft-start circuitry in order to prevent start-up surges. Other protection features
include:
* Current Limit (ILIMIT)-Current sensing for over current and overload protection
* Over Voltage Protection (OVP)-Output over voltage protection to prevent operation above a safe upper limit
* Under Voltage Lockout (UVLO)-UVLO designed to prevent operation at very low input voltages
Setting the LED Current
The current through the LED string is set by the resistor, RADJ. This value can be calculated using Equation 1:
0.25V
Eq. (1)
ILED
RADJ
VDD
VDD is an internal linear regulator power supply for the internal circuitry of the UTC L5107. A 10μF ceramic bypass
capacitor is required at the VDD pin. This pin is for filtering only and should not connect an external load to this pin.
Soft Start
A soft start build in the boost switching converter is used to limit the inrush current from the line supply. The soft
start delay can be set using the compensation capacitor (CCOMP in Figure 2).
A 10nF ceramic capacitor will be OK at all operating conditions.
Oscillator and Switching Frequency Selection
In the UTC L5107, the switching frequency can be set by choosing the appropriate value for the resistor, RFS
according to Equation 2:
1.035
7530
kHz
Eq. (2)
RFS
KΩ
FSW
Dithering
The UTC L5107 has a feature which dithers the switching frequency by ±10%. The purpose of this dithering is to
help achieve a spread spectrum of the conducted EMI noise. This can allow for an overall reduction in noise
emission by approximately 10dB.
LED Dimming
The UTC L5107 of LED drivers can dim the brightness of the LED string. A PWM input signal of up to 500Hz can
be applied to the PWMD pin (see Figure 2) to pulse the LED string ON and OFF. It is recommended to use PWM
dimming signals above 120Hz to avoid any recognizable flicker by the human eye. PWM dimming is the preferred
way to dim a LED in order to prevent color/wavelength shifting, as occurs with analog dimming. The output current
level remains constant during each PWMD pulse.
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L5107
Preliminary
LINEAR INTEGRATED CIRCUIT
POWER TOPOLOGY(Cont.)
Output Over Voltage Protection (OVP)
The UTC L5107 provides an OVP circuitry with a reference value of 1.25V in order to protect the system from an
over voltage fault condition. This OVP point can be programmed through the use of external resistors (R1 and R2 in
Figure 2). This OVP voltage can be calculated using Equation 3:
1.25(R1 R2 )
Eq. (3)
VOVP
R2
Current Limit
The UTC L5107 features a current limit protection feature to prevent any current runaway conditions. The current
limit circuitry monitors current on a pulse by pulse basis. It limits the current through the inductor by sensing the
voltage across RCS. When 0.45V is present at the IS pin, the pulse is truncated. The next pulse continues as
normally until the IS pin reaches 0.45V and it is truncated once again. This will continue until the output load is
decreased.
Select RCS using Equation 4:
0.45
Eq. (4)
RCS
VOUTMAX - VINMIN D
ILPK_LIMIT
LFSW
Slope Compensation
The UTC L5107 requires slope compensation for the peak current mode controller. The UTC L5107 uses an
external resistor, RSLC for slope compensation. The ability to set the proper slope compensation through the use of a
single external component results in design flexibility. Select RSLC using Equation 5:
VOUTMAX VINMIN
L 250μΑ FSW
RCS
Eq. (5)
RSLC
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L5107
Preliminary
LINEAR INTEGRATED CIRCUIT
TYPICAL APPLICATION CIRCUIT
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L5107
Preliminary
LINEAR INTEGRATED CIRCUIT
UTC assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or
other parameters) listed in products specifications of any and all UTC products described or contained
herein. UTC products are not designed for use in life support appliances, devices or systems where
malfunction of these products can be reasonably expected to result in personal injury. Reproduction in
whole or in part is prohibited without the prior written consent of the copyright owner. The information
presented in this document does not form part of any quotation or contract, is believed to be accurate
and reliable and may be changed without notice.
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