FL3100T [ONSEMI]

Low-Side Gate Driver with LED PWM Dimming Control;
FL3100T
型号: FL3100T
厂家: ONSEMI    ONSEMI
描述:

Low-Side Gate Driver with LED PWM Dimming Control

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August 2015  
FL3100T  
Low-Side Gate Driver with LED PWM Dimming Control  
for Smart LED Lighting  
Features  
Description  
The FL3100T 2 A gate driver is designed to drive an N-  
channel enhancement-mode MOSFET in low-side  
switching applications by providing high peak current  
pulses during the short switching intervals. The  
FL3100T has two inputs that can be configured to  
operate in non-inverting (IN) mode with a DIM pin for  
PWM dimming control of the LED Driver. High accuracy  
PWM dimming control required in smart LED drivers is  
possible by adjusting the duty ratio of the DIM input. If  
one or both inputs are left unconnected, internal  
resistors bias the inputs such that the output is pulled  
LOW to hold the power MOSFET off.  
.
Non-inverting Input Logic with DIM Control Input for  
PWM Dimming Down to 0.1% for Hybrid Dimming  
.
.
.
.
.
4.5 to 18 V Operating Range  
TTL Inputs Independent of Supply Voltage  
2.5 A Sink / 1.8 A Source at VOUT = 6 V  
Internal Resistors Turn Driver Off If No Inputs  
13 ns Typical Rise Time and 9 ns Typical Fall-Time  
with 1 nF Load  
.
.
MillerDrive™ Technology  
The driver is available with fixed TTL input thresholds.  
Internal circuitry provides an under-voltage lockout  
function by holding the output LOW until the supply  
voltage is within operating range. The FL3100T delivers  
fast MOSFET switching performance, which helps  
maximize efficiency in high-frequency LED driver  
designs.  
Typical Propagation Delay Time Under 20 ns with  
Input Falling or Rising  
.
.
6-Lead, 2 x 2 mm MLP or 5-Pin, SOT23 Packages  
Rated from -40°C to 125°C Ambient  
Applications  
The FL3100T is available in a 5-pin, SOT23 or a  
2 x 2 mm, 6-lead, Molded Leadless Package (MLP) for  
the smallest size with excellent thermal performance.  
.
.
Smart LED Drivers with Accurate PWM Dimming  
General LED Lighting  
Typical Application Circuit  
ILED  
VDD  
FL3100T  
IN  
OUT  
MCU  
DIM  
Figure 1. LED PWM Dimming Application Circuit for Smart LED Lighting  
© 2015 Fairchild Semiconductor Corporation  
FL3100T • Rev.1.0  
www.fairchildsemi.com  
 
Ordering Information  
Part Number  
FL3100TMPX  
FL3100TSX  
Package  
6-Lead, 2 x 2 mm MLP  
5-Pin, SOT23  
Packing Method  
Tape & Reel  
Quantity / Reel  
3000  
Tape & Reel  
3000  
Block Diagrams  
1
VDD  
UVLO  
VDD_OK  
100k  
IN  
3
5
OUT  
100k  
100k  
4
DIM  
2
GND  
Figure 2. Simplified Block Diagram (SOT23 Pin-out)  
3
VDD  
UVLO  
100k  
VDD_OK  
IN  
1
4
OUT  
100k  
100k  
6
2
DIM  
AGND  
5
PGND  
0.4  
Figure 3.  
Simplified Block Diagram (MLP Pin-out)  
© 2015 Fairchild Semiconductor Corporation  
FL3100T • Rev.1.0  
www.fairchildsemi.com  
2
 
 
Functional Pin Configurations  
VDD  
GND  
IN  
5
4
1
2
3
OUT  
DIM  
IN  
6
5
4
1
2
3
DIM  
AGND  
VDD  
PGND  
OUT  
Figure 4. 6-Lead MLP (Top View)  
Figure 5.  
SOT23-5 (Top View)  
Pin Definitions  
SOT23 MLP  
Pin # Pin #  
Name  
Pin Description  
1
3
2
VDD  
Supply Voltage. Provides power to the IC.  
AGND Analog ground for input signals (MLP only). Connect to PGND underneath the IC.  
GND Ground (SOT-23 only). Common ground reference for input and output circuits.  
2
3
Input. Non-inverting logic. If IN is not used, connect to VDD to enable regular operation  
of the output.  
1
6
IN  
Dimming Input. Used for PWM dimming. Inverting logic. If dimming is not used, connect  
to AGND or PGND to enable regular operation of the output.  
4
5
DIM  
Gate Drive Output: Held low unless required inputs are present and VDD is above UVLO  
threshold.  
4
OUT  
Thermal Pad (MLP only). Exposed metal on the bottom of the package, which is  
electrically connected to pin 5.  
Pad  
5
P1  
Power Ground (MLP only). For output drive circuit; separates switching noise from  
PGND  
inputs.  
Output Logic  
IN  
DIM  
0
OUT  
0(1)  
0(1)  
1
0
0
1
0
1(1)  
0
1
1(1)  
Note:  
1. Default input signal if no external connection is made.  
© 2015 Fairchild Semiconductor Corporation  
FL3100T • Rev.1.0  
www.fairchildsemi.com  
3
 
Thermal Characteristics(2)  
(3)  
(4)  
JT  
(5)  
JA  
Package  
Unit  
JL  
6-Lead, 2 x 2 mm Molded Leadless Package (MLP)  
2.7  
56  
133.0  
99  
58.0  
157  
°C/W  
°C/W  
SOT23-5  
Notes:  
2. Estimates derived from thermal simulation; actual values depend on the application.  
3. Theta_JL (JL): Thermal resistance between the semiconductor junction and the bottom surface of all the leads  
(including any thermal pad) that are typically soldered to a PCB.  
4. Theta_JT (JT): Thermal resistance between the semiconductor junction and the top surface of the package,  
assuming it is held at a uniform temperature by a top-side heatsink.  
5. Theta_JA (ΘJA): Thermal resistance between junction and ambient, dependent on the PCB design, heat sinking,  
and airflow. The value given is for natural convection with no heatsink using a 2SP2 board, as specified in  
JEDEC standards JESD51-2, JESD51-5, and JESD51-7, as appropriate.  
Absolute Maximum Ratings  
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be  
operable above the recommended operating conditions and stressing the parts to these levels is not recommended.  
In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability.  
The absolute maximum ratings are stress ratings only.  
Symbol  
VDD  
Parameter  
Min.  
Max.  
Unit  
V
VDD to PGND  
-0.3  
20.0  
VIN  
Voltage on IN and DIM to GND, AGND, or PGND  
Voltage on OUT to GND, AGND, or PGND  
Lead Soldering Temperature (10 Seconds)  
Junction Temperature  
GND - 0.3 VDD + 0.3  
GND - 0.3 VDD + 0.3  
+260  
V
VOUT  
TL  
V
ºC  
ºC  
ºC  
TJ  
-55  
-65  
+150  
+150  
TSTG  
Storage Temperature  
Recommended Operating Conditions  
The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended  
operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not  
recommend exceeding them or designing to Absolute Maximum Ratings.  
Symbol  
VDD  
Parameter  
Min.  
4.5  
0
Max.  
18.0  
VDD  
Unit  
V
Supply Voltage Range  
Input Voltage IN, DIM  
VIN  
V
TA  
Operating Ambient Temperature  
-40  
+125  
ºC  
© 2015 Fairchild Semiconductor Corporation  
FL3100T • Rev.1.0  
www.fairchildsemi.com  
4
 
 
 
 
Electrical Characteristics  
Unless otherwise noted, VDD = 12 V, TJ = -40°C to +125°C. Currents are defined as positive into the device and  
negative out of the device.  
Symbol  
Supply  
VDD  
Parameter  
Conditions  
Min. Typ. Max. Unit  
Operating Range  
4.5  
18.0  
0.80  
V
Supply Current Inputs/  
EN Not Connected  
IDD  
0.50  
mA  
VON  
VOFF  
Turn-On Voltage  
Turn-Off Voltage  
3.5  
3.3  
3.9  
3.7  
4.3  
4.1  
V
V
Inputs  
VINL_T  
VINH_T  
IIN  
IN, DIM Logic LOW Voltage, Maximum  
IN, DIM Logic HIGH Voltage, Minimum  
Non-inverting Input  
0.8  
V
V
2.0  
175  
1
IN from 0 to VDD  
-1  
µA  
µA  
V
IDIMim  
VHYS  
DIM Input  
IN from 0 to VDD  
-175  
0.2  
IN, DIM Logic Hysteresis Voltage  
0.4  
0.8  
Output  
OUT at VDD/2,  
CLOAD = 0.1 µF, f = 1 kHz  
ISINK  
OUT Current, Mid-Voltage, Sinking(6)  
2.5  
A
A
OUT at VDD/2,  
CLOAD = 0.1 µF, f = 1 kHz  
ISOURCE  
IPK_SINK  
OUT Current, Mid-Voltage, Sourcing(6)  
OUT Current, Peak, Sinking(6)  
-1.8  
CLOAD = 0.1 µF, f = 1 kHz  
CLOAD = 0.1 µF, f = 1 kHz  
CLOAD = 1000 pF  
3
-3  
A
A
IPK_SOURCE OUT Current, Peak, Sourcing(6)  
tRISE  
tFALL  
tD1, tD2  
IRVS  
Notes:  
Output Rise Time(7)  
13  
9
20  
14  
30  
ns  
ns  
ns  
mA  
Output Fall Time(7)  
CLOAD = 1000 pF  
Output Prop. Delay, TTL Inputs(7)  
Output Reverse Current Withstand(6)  
0 5 VIN; 1 V/ns Slew Rate  
9
16  
500  
6. Not tested in production.  
7. See Timing Diagrams of Figure 6 and Figure 7.  
© 2015 Fairchild Semiconductor Corporation  
FL3100T • Rev.1.0  
www.fairchildsemi.com  
5
 
 
Timing Diagrams  
90%  
90%  
Output  
Output  
10%  
10%  
VINH  
Input  
VINL  
VINH  
VINL  
PWM  
tD1  
tD2  
tD1  
tD2  
tRISE  
tFALL  
tFALL  
tRISE  
Figure 6.  
IN Pin  
Figure 7. DIM Pin  
© 2015 Fairchild Semiconductor Corporation  
FL3100T • Rev.1.0  
www.fairchildsemi.com  
6
Typical Performance Characteristics  
Typical characteristics are provided at 25°C and VDD=12 V unless otherwise noted.  
Figure 8. IDD (Static) vs. Supply Voltage  
Figure 9. IDD (No-Load) vs. Frequency  
1 nF Load  
Figure 10. IDD (1 nF Load) vs. Frequency  
Figure 11. IDD (Static) vs. Temperature  
Figure 12. Input Thresholds vs. Supply Voltage  
Figure 13. TTL Input Thresholds vs. Temperature  
© 2015 Fairchild Semiconductor Corporation  
FL3100T • Rev.1.0  
www.fairchildsemi.com  
7
 
 
Typical Performance Characteristics  
Typical characteristics are provided at 25°C and VDD=12 V unless otherwise noted.  
Figure 14. UVLO Thresholds vs. Temperature  
Figure 15. UVLO Hysteresis vs. Temperature  
Non-Inverting Input  
Figure 16. Propagation Delay vs. Supply Voltage  
Inverting Input  
Figure 17. Propagation Delay vs. Temperature  
Figure 18. Propagation Delay vs. Temperature  
Figure 19. Fall Time vs. Supply Voltage  
© 2015 Fairchild Semiconductor Corporation  
FL3100T • Rev.1.0  
www.fairchildsemi.com  
8
Typical Performance Characteristics  
Typical characteristics are provided at 25°C and VDD=12 V unless otherwise noted.  
Figure 20. Rise Time vs. Supply Voltage  
Figure 21. Rise and Fall Time vs. Temperature  
Figure 22. Rise / Fall Waveforms with 1 nF Load  
Figure 23. Rise / Fall Waveforms with 10 nF Load  
Figure 24. Quasi-Static Source Current with VDD=12 V  
Figure 25. Quasi-Static Sink Current with VDD=12 V  
© 2015 Fairchild Semiconductor Corporation  
FL3100T • Rev.1.0  
www.fairchildsemi.com  
9
Typical Performance Characteristics  
Typical characteristics are provided at 25°C and VDD=12 V unless otherwise noted.  
Figure 26. Quasi-Static Source Current with VDD=8 V  
Figure 27. Quasi-Static Sink Current with VDD=8 V  
VDD  
470µF  
Al. El.  
4.7µF  
ceramic  
Current Probe  
LECROY AP015  
IOUT  
IN  
1kHz  
1µF  
ceramic  
CLOAD  
0.1µF  
VOUT  
Figure 28. Quasi-Static IOUT / VOUT Test Circuit  
© 2015 Fairchild Semiconductor Corporation  
FL3100T • Rev.1.0  
www.fairchildsemi.com  
10  
Applications Information  
PWM Dimming  
0%  
50%  
90%  
DIM  
Duty  
(%)  
FL3100T is used for pulse-width modulation of the LED  
current to control the amount of light produced by the  
LED in MCU-driven hybrid dimming applications.  
t
There are two factors to consider, PWMamplitude controls  
the LED light output by reducing the forward current in  
the LED and PWMlight controls the on time of forward  
current in the LED.  
IN  
t
t
OUT  
In the typical application circuit, Figure 1 and repeated  
here Figure 29, IN is connected to the PWMamplitude  
signal coming out of the MCU to control the amplitude of  
the overall LED current. This PWMamplitude signal from  
the MCU is the same PWM signal based on the  
switching frequency of the power stage and error signal  
in a closed loop LED driver stage.  
100%  
ILED  
10%  
50%  
t
Figure 30.  
LED Current with PWM Dimming  
DIM is connected to a different PWM signal, also from  
the MCU, but is usually a lower frequency signal to  
command the PWMlight dimming on the LED current, i.e.  
~1 kHz and can be commanded from a wired or wireless  
interface such as DALI or ZigBee. Therefore, mixed  
mode dimming using both amplitude and PWM dimming  
on the LED current is possible.  
Input Thresholds  
In the FL3100T, the input thresholds meet industry-  
standard TTL logic thresholds, independent of the VDD  
voltage, and there is  
a
hysteresis voltage of  
approximately 0.4 V. These levels permit the inputs to  
be driven from a range of input logic signal levels for  
which a voltage over 2 V is considered logic HIGH. The  
driving signal for the TTL inputs should have fast rising  
and falling edges with a slew rate of 6 V/µs or faster, so  
the rise time from 0 to 3.3 V should be 550 ns or less.  
With reduced slew rate, circuit noise could cause the  
driver input voltage to exceed the hysteresis voltage and  
retrigger the driver input, causing erratic operation.  
ILED  
VDD  
Static Supply Current  
FL3100T  
IN  
In the IDD (static) typical performance graphs (Figure 8,  
and Figure 11), the curve is produced with all inputs  
floating (OUT is LOW) and indicates the lowest static IDD  
current for the tested configuration. For other states,  
additional current flows through the 100 kresistors on  
the inputs and outputs shown in the block diagrams (see  
Figure 2 - Figure 3). In these cases, the actual static IDD  
current is the value obtained from the curves plus this  
additional current.  
OUT  
MCU  
DIM  
Figure 29. LED PWM Dimming Application  
Under-Voltage Lockout (UVLO)  
During amplitude dimming (PWMamplitude), DIM stays low  
and there is no PWMlight dimming. When PWMlight  
dimming becomes active, e.g. below 20% of amplitude  
(PWMamplitude) dimming, then amplitude dimming is held  
constant and PWMlight dimming is used to reduce the  
light output down to ~0.1% accurately. Figure 30 shows  
a possible implementation for mixed mode dimming.  
The FL3100T startup logic is optimized to drive ground  
referenced N-channel MOSFETs with an Under-Voltage  
Lockout (UVLO) function to ensure that the IC starts up  
in an orderly fashion. When VDD is rising, yet below the  
3.9 V operational level, this circuit holds the output  
LOW, regardless of the status of the input pins. After the  
part is active, the supply voltage must drop 0.2 V before  
the part shuts down. This hysteresis helps prevent  
chatter when low VDD supply voltages have noise from  
the power switching. This configuration is not suitable  
for driving high-side P-channel MOSFETs because the  
low output voltage of the driver would turn the P-channel  
MOSFET on with VDD below 3.9 V.  
© 2015 Fairchild Semiconductor Corporation  
FL3100T • Rev.1.0  
www.fairchildsemi.com  
11  
 
 
VDD Bypass Capacitor Guidelines  
Layout and Connection Guidelines  
To enable this IC to turn a power device on quickly, a  
local, high-frequency, bypass capacitor CBYP with low  
ESR and ESL should be connected between the VDD  
and GND pins with minimal trace length. This capacitor  
is in addition to bulk electrolytic capacitance of 10 µF to  
47 µF often found on driver and controller bias circuits.  
The FL3100T incorporates fast-reacting input circuits,  
short propagation delays, and powerful output stages  
capable of delivering current peaks over 2 A to facilitate  
voltage transition times from under 10 ns to over 100 ns.  
The following layout and connection guidelines are  
strongly recommended:  
.
Keep high-current output and power ground paths  
separate from logic input signals and signal ground  
paths. This is especially critical when dealing with  
TTL-level logic thresholds.  
A typical criterion for choosing the value of CBYP is to  
keep the ripple voltage on the VDD supply ≤5%. Often  
this is achieved with a value ≥ 20 times the equivalent  
load capacitance CEQV, defined here as Qgate/VDD  
.
Ceramic capacitors of 0.1 µF to 1 µF or larger are  
common choices, as are dielectrics, such as X5R and  
X7R, which have good temperature characteristics and  
high pulse current capability.  
.
Keep the driver as close to the load as possible to  
minimize the length of high-current traces. This  
reduces the series inductance to improve high-  
speed switching, while reducing the loop area that  
can radiate EMI to the driver inputs and other  
surrounding circuitry.  
If circuit noise affects normal operation, the value of  
CBYP may be increased to 50-100 times the CEQV, or  
CBYP may be split into two capacitors. One should be a  
larger value, based on equivalent load capacitance, and  
the other a smaller value, such as 1-10 nF, mounted  
closest to the VDD and GND pins to carry the higher-  
frequency components of the current pulses.  
.
The FL3100T is available in two packages with  
slightly different pinouts, offering similar  
performance. In the 6-pin MLP package, Pin 2 is  
internally connected to the input analog ground and  
should be connected to power ground, Pin 5,  
through a short direct path underneath the IC. In  
the 5-pin SOT23, the internal analog and power  
ground connections are made through separate,  
individual bond wires to Pin 2, which should be  
used as the common ground point for power and  
control signals.  
MillerDrive™ Gate Drive Technology  
FL3100T drivers incorporate the MillerDrive™  
architecture shown in Figure 31 for the output stage, a  
combination of bipolar and MOS devices capable of  
providing large currents over a wide range of supply  
voltage and temperature variations. The bipolar devices  
carry the bulk of the current as OUT swings between 1/3  
to 2/3 VDD and the MOS devices pull the output to the  
high or low rail.  
.
.
Many high-speed power circuits can be susceptible  
to noise injected from their own output or other  
external sources, possibly causing output re-  
triggering. These effects can be especially obvious  
if the circuit is tested in breadboard or non-optimal  
circuit layouts with long input, enable, or output  
leads. For best results, make connections to all pins  
as short and direct as possible.  
The purpose of the MillerDrive™ architecture is to  
speed up switching by providing the highest current  
during the Miller plateau region when the gate-drain  
capacitance of the MOSFET is being charged or  
discharged as part of the turn-on / turn-off process.  
The turn-on and turn-off current paths should be  
minimized as discussed in the following sections.  
The output pin slew rate is determined by VDD voltage  
and the load on the output. It is not user adjustable, but  
if a slower rise or fall time at the MOSFET gate is  
needed, a series resistor can be added.  
Figure 32 shows the pulsed gate drive current path  
when the gate driver is supplying gate charge to turn the  
MOSFET on. The current is supplied from the local  
bypass capacitor, CBYP, and flows through the driver to  
the MOSFET gate and to ground. To reach the high  
peak currents possible, the resistance and inductance in  
the path should be minimized. The localized CBYP acts  
to contain the high peak current pulses within this driver-  
MOSFET circuit, preventing them from disturbing the  
sensitive analog circuitry in the PWM controller.  
VDD  
Input  
stage  
VOUT  
VDD  
VDS  
CBYP  
FL3100T  
PWM  
Figure 31. MillerDrive™ Output Architecture  
Figure 32.  
Current Path for MOSFET Turn-On  
© 2015 Fairchild Semiconductor Corporation  
FL3100T • Rev.1.0  
www.fairchildsemi.com  
12  
 
 
Figure 33 shows the current path when the gate driver  
turns the MOSFET off. Ideally, the driver shunts the  
current directly to the source of the MOSFET in a small  
circuit loop. For fast turn-off times, the resistance and  
inductance in this path should be minimized.  
VDD  
Turn-on  
Threshold  
DIM  
IN  
VDD  
VDS  
CBYP  
FL3100T  
OUT  
PWM  
Figure 34.  
IN Startup Waveforms  
Thermal Guidelines  
Figure 33.  
Current Path for MOSFET Turn-Off  
Gate drivers used to switch MOSFETs and IGBTs at  
high frequencies can dissipate significant amounts of  
power. It is important to determine the driver power  
dissipation and the resulting junction temperature in the  
application to ensure that the part is operating within  
acceptable temperature limits.  
Table 1.  
Truth Table of Logic Operation  
The truth table indicates the operational states using the  
IN and DIM pins.  
IN  
DIM  
OUT  
The total power dissipation in a gate driver is the sum of  
two components; PGATE and PDYNAMIC:  
0
0
1
1
0
1
0
1
0
0
1
0
PTOTAL = PGATE + PDYNAMIC  
(1)  
If the DIM pin is connected to logic HIGH, a disable  
function is realized, and the driver output remains LOW  
regardless of the state of the IN pin. Likewise, If the IN  
pin is connected to logic LOW, a disable function is  
realized, and the driver output remains LOW regardless  
of the state of the DIM pin.  
Operational Waveforms  
At power up, the driver output remains LOW until the  
VDD voltage reaches the turn-on threshold. The  
magnitude of the OUT pulses rises with VDD until  
steady-state VDD is reached. The non-inverting  
operation illustrated in Figure 34 shows that the output  
remains LOW until the UVLO threshold is reached, and  
then the output is in-phase with the input.  
© 2015 Fairchild Semiconductor Corporation  
FL3100T • Rev.1.0  
www.fairchildsemi.com  
13  
 
 
Gate Driving Loss: The most significant power loss  
results from supplying gate current (charge per unit  
time) to switch the load MOSFET on and off at the  
switching frequency. The power dissipation that results  
from driving a MOSFET at a specified gate-source  
voltage, VGS, with gate charge, QG, at switching  
frequency, fSW, is determined by:  
In a typical MOSFET gate drive application, the  
FDS2672 would be a potential MOSFET selection. The  
typical gate charge would be 32 nC with VGS = VDD =  
10 V. Using a TTL input driver at a switching frequency  
of 500 kHz, the total power dissipation can be calculated  
as:  
PGATE = 32 nC • 10 V • 500 kHz = 0.160 W  
PDYNAMIC = 8 mA • 10 V = 0.080 W  
PTOTAL = 0.24 W  
(5)  
(6)  
(7)  
PGATE = QG • VGS • fSW  
(2)  
Dynamic Pre-drive / Shoot-through Current: A power loss  
resulting from internal current consumption under  
dynamic operating conditions, including pin pull-up /  
pull-down resistors, can be obtained using the IDD (no-  
Load) vs. Frequency graphs in Typical Performance  
Characteristics to determine the current IDYNAMIC drawn  
from VDD under actual operating conditions:  
The 5-pin SOT23 has  
a junction-to-lead thermal  
characterization parameter JB = 51°C/W.  
In a system application, the localized temperature  
around the device is a function of the layout and  
construction of the PCB along with airflow across the  
surfaces. To ensure reliable operation, the maximum  
junction temperature of the device must be prevented  
from exceeding the maximum rating of 150°C; with 80%  
derating, TJ would be limited to 120°C. Rearranging  
Equation (4) determines the board temperature required  
to maintain the junction temperature below 120°C:  
PDYNAMIC = IDYNAMIC • VDD  
(3)  
Once the power dissipated in the driver is determined,  
the driver junction rise with respect to circuit board can  
be evaluated using the following thermal equation,  
JB  
design (heat sinking and air flow):  
assuming  
was determined for a similar thermal  
(8)  
(9)  
TB,MAX = TJ - PTOTAL  
JB  
(4)  
TJ  
= PTOTAL  
JB + TB  
where:  
TJ  
TB,MAX = 120°C – 0.24W • 51°C/W = 108°C  
= driver junction temperature  
For comparison purposes, replace the 5-pin SOT23  
used in the previous example with the 6-pin MLP  
JB  
= (psi) thermal characterization parameter  
relating temperature rise to total power  
dissipation  
JB  
package with  
= 2.8°C/W. The 6-pin MLP package  
can operate at a PCB temperature of 119°C, while  
maintaining the junction temperature below 120°C. This  
illustrates that the physically smaller MLP package with  
thermal pad offers a more conductive path to remove  
the heat from the driver. Consider the tradeoffs between  
reducing overall circuit size with junction temperature  
reduction for increased reliability.  
TB = board temperature in location defined in the  
Thermal Characteristics table.  
Typical Application Diagram  
Boost  
Isolated DC to DC  
ILED  
VDD  
FL3100T  
PWM  
Controllers  
IN  
AC Input  
OUT  
DIM  
MCU  
(DC-DC  
Control)  
Communication  
Chipset  
Figure 35.  
Smart LED Driver using the MCU and FL3100T in the Buck DC-DC Stage  
© 2015 Fairchild Semiconductor Corporation  
FL3100T • Rev.1.0  
www.fairchildsemi.com  
14  
 
0.05 C  
2.0  
A
1.72  
1.68  
2X  
B
4
6
0.15  
1.21  
2.0  
0.90  
2.25  
0.52(6X)  
0.05 C  
1
3
PIN#1 IDENT  
TOP VIEW  
2X  
0.42(6X)  
0.65  
RECOMMENDED  
LAND PATTERN  
ꢂꢁꢈꢃ“ꢂꢁꢂꢃ  
0.10 C  
ꢂꢁꢀꢂ“ꢂꢁꢂꢃ  
NOTES:  
0.08 C  
SIDE VIEW  
C
ꢂꢁꢂꢀꢃ“ꢂꢁꢂꢀꢃ  
SEATING  
PLANE  
A. PACKAGE DOES NOT FULLY CONFORM  
TO JEDEC MO-229 REGISTRATION  
B. DIMENSIONS ARE IN MILLIMETERS.  
C. DIMENSIONS AND TOLERANCES PER  
ASME Y14.5M, 2009.  
ꢀꢁꢂꢂ“ꢂꢁꢂꢃ  
ꢄꢁꢅꢂ“ꢂꢁꢂꢃ  
D. LAND PATTERN RECOMMENDATION IS  
EXISTING INDUSTRY LAND PATTERN.  
(0.70)  
PIN #1 IDENT  
(0.20)4X  
E. DRAWING FILENAME: MKT-MLP06Krev5.  
1
3
(0.40)  
ꢂꢁꢇꢀ“ꢂꢁꢂꢃ  
(6X)  
ꢂꢁꢆꢂ“ꢂꢁꢂꢃ  
(0.60)  
6
4
(6X)  
ꢂꢁꢇꢂ“ꢂꢁꢂꢃ  
0.10  
0.65  
C A B  
1.30  
0.05  
C
BOTTOM VIEW  
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