Datasheet

THL6517_Rev.1.01_E
THL6517
6 channels LED Driver
Description
Features
THL6517 is a 6 channels LED driver. THL6517 has a
built-in boost converter, since back light system can
consist of 1 chip.
Soft start / Over current protection / Vout short circuit
protection / Under voltage lock out protection / Over
voltage protection / LED short protection / LED open
protection / Thermal shut down are built in.
Mounted area is reducible by 16-pin QFN.
・Input voltage range : 2.7V - 24V
・Boost converter
Maximum output voltage : 38V
Switching frequency range : 1MHz
・LED driver
Up to 60mA per channel
Current accuracy : +/-3%
Current matching : +/-2.5%
・PWM dimming control : 100Hz - 30kHz
・Protection circuit
Soft start
Over current protection
Vout short circuit protection
Under voltage lock out protection
Over voltage protection
LED short protection
LED open protection
Thermal shut down
・3mm x 3mm QFN 16pin package
Application
・Mobile phone display backlight
・Car Navigator display backlight
・Laptop/Netbook/Tablet PC display backlight
Pin Configuration
Block Diagram
NC
EN
OUT6
OUT5
16
15
14
13
VIN
LX
VCC
PGND
1
12
OUT4
REG
Regulator
EN
LX
2
11
PWM
SS
Exposed Thermal Pad
VCC
VOUT(OVP)
(Top view)
3
10
17 GNDEXP
Boost
PGND
Protect
circuit
VOUT
OSC
AGND
6
OUT1
PWM
4
9
OUT2
REXT
OUT3
OUT3
OSC
5
6
7
8
REXT
REG
OUT1
OUT2
OSC
Current
driver
OUT4
OUT5
OUT6
AGND
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THL6517_Rev.1.01_E
Absolute Maximum Ratings
Parameter
Symbol
VCC
VH1
VH2
VL
Pd
Tj
Tstg
VCC voltage
LX voltage
OUT[6:1] voltage
EN, PWM voltage
Power dissipation
Junction temperature (*1)
Storage temperature range
Rating
27
45
40
27
2.33
-40 to +125
-55 to +150
Units
V
V
V
V
W
℃
℃
*1. The operating temperature range should perform a thermal design, after consulting the thermal characteristic. Please use it in the range which
does not exceed junction temperature.
Recommended Operating Conditions
Parameter
Min
2.7
3
0.1
VCC voltage
OUT[6:1] voltage
LED output current
PWM dimming control
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Typ
-
Max
24
38
60
30
Units
V
V
mA
kHz
THine Electronics, Inc.
THL6517_Rev.1.01_E
Pin Description
Number
1
Name
PGND
2
LX
3
VCC
4
VOUT(OVP)
5
REXT
6
REG
Function
Power ground.
Boost converter switching
output pin.
Input supply voltage pin.
Over voltage protection
input pin.
LED current set pin.
Regulator output pin
10
OUT1 to
OUT3
AGND
11
PWM
12, 13,
14
OUT4 to
OUT6
15
EN
Enable pin.
16
NC
No connection pin
17
GNDEXP
7, 8, 9
LED current sink
regulation input pins.
Analog ground.
PWM dimming control
input pin.
LED current sink
regulation input pins.
Back side.
Description
Power ground pin of boost converter.
This pin is switching output of boost converter.
Power supply pin.
This pin is the over voltage protection circuit setting input
of the boost converter for LED driver. OVP pin is fixation.
LED current is set by the value of the external resistor.
This pin is output pin for regulator. Please connect 0.1uF
capacitor to GND.
These pins are the constant current output.
The constant current is determined by REXT resistor.
Analog ground of LED driver.
This pin is control input to LED dimming.
These pins are the constant current output.
The constant current is determined by REXT resistor.
If low level voltage is impressed, the LED driver is
shutdown.
This pin is no connection. Please open.
GND EXP should be soldered to GND to improve the
thermal characteristics.
Power Dissipation
Power Dissipation [mW]
2500
2000
1500
1000
500
0
-40
-20
0
20
40
60
80
100
120
140
Operating Temperature [ ℃ ]
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THL6517_Rev.1.01_E
Electrical Characteristics
Parameter
(at VCC=12V , Ta=25℃, unless otherwise noted)
Symbol
Input quiescent Current 1
Standby current
Icc1
Ist
Test Conditions
Vpc=0V(No switching)
EN>1.9V
Typ
Max
Units
-
2
3
mA
-
-
18
uA
2.4
2.5
2.6
V
-
0.15
-
V
Rpwm_en
-
800
-
kΩ
Vpwm_h
1.9
-
-
V
Vpwm_l
-
-
0.8
V
Tmin_pulse
-
0.5
-
usec
Fosc
0.8
1
1.2
MHz
Maximum duty cycle
Dmax
-
92
-
%
Minimum ON-time
Dmin
-
12.5
-
%
UVLO threshold voltage
Vuvlo
UVLO hysteresis voltage
dVuvloh
PWM/EN pull down resistance
PWM/EN input high voltage
PWM/EN input low voltage
PWM/EN minimum pulse
Boost converter switching
frequency
LX ON-resistance
EN<0.8V
Min
VCC rising
Ron
LX current limit
-
0.2
0.45
Ω
Ilim1
VIN>3.3V
2.2
2.8
-
A
Ilim2
VIN=2.6V
-
-
A
VCC>2.7V, CHx>0.7V
30
-
-
VCC>4.5V, CHx>1V
60
-
-
-
-
3
LED current per channel
Iled_max
OUTx pin leakage current
Ileak
VOUT=36V
OUTx pin regulation threshold
Vout
Rrext=62kΩ
REXT pin voltage
Vrext
0.6
-
V
1.229
1.253
V
19.4
20.0
20.6
mA
-
1
2.5
%
Vovp
38
39
40
V
Vscp
0.79
1.58
2.37
V
Vled_s
15
17
20
V
LED current matching
Dled
short
circuit
threshold
LED short protection
protection
uA
-
Iled
OVP
mA
1.204
LED current accuracy
Over voltage protection threshold
0.5 x
Ilim1
Irext = 20uA
Rrext=62kΩ
(Imax-Imin)/Iave
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THL6517_Rev.1.01_E
power supply is inputted, the voltage difference of input
Function
voltage and output voltage becomes the largest at the
Input voltage / Output voltage
moment of Under voltage protection lock out (UVLO)
If the difference of input voltage and output voltage
being canceled.
becomes large, the ON duty cycle (Don) will become
In this condition, most much current flows from an input.
small. Depending on the conditions of input and output
When input voltage is inputted slowly, the over-current
voltage, the pulse width below the minimum pulse width,
protection circuit is operated for the above-mentioned
125nsec is needed. In this case, a pulse is skipped and
reason. In that case, please input into VCC after inputting
frequency is decreased. Please decide the input and
EN input or PWM input. In inputting into VCC, please
output voltage condition with considering a maximum
use the conditions that it does not become an
duty cycle and the minimum pulse width.
over-current.
Moreover, if the input voltage is unstable, please
connect R-C filter to the input line. When input
voltage rises steeply, by the capacitive coupling of
Boost converter
the inside transistor of IC, excess voltage may be
The boost converter for an LED drive is built in. The
built over the low resisting pressure element
voltage of an LED constant current output OUTn pin is
inside IC, and it may become a cause of failure. If
feedback, and the suitable voltage for the anode of LED
input voltage rises sharply, excess voltage is
is supplied.
added to a low resisting pressure element by the
capacitive coupling of the inside transistor of IC.
Thereby, it may become a cause of failure. It
Enable
recommends inserting the filter (Fig. 1) of 10ohm
The standby function is carried. When a low level signal
/ 1uF in a VCC pin.
is inputted into EN pin, it will be in a standby state. And
a boost converter and an LED constant current output are
VIN
suspended. The consumed current is set to less than
18uA in a standby state. EN does not have restriction of
an input sequence. If inputted into EN before the input of
10Ω
1uF
Fig. 1
VCC, there is no problem.
VCC
Filter setup of VCC input
PWM dimming
The dimming function is carried. It is possible to control
<<Notes>>
ON/OFF of the constant current output for LED by
This product contains the over
current protection
inputting in a PWM signal. An LED output becomes
destruction of IC from the
active when a PWM signal is a high level. Please input a
output abnormality of a boost converter. Please refer to
dimming signal in 30 kHz from 100 Hz. The minimum
Over current protection (OCP) for details.
Duty cycle DPWMmin which can be set up by a PWM
circuit in order to protect
After a
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THL6517_Rev.1.01_E
dimming function is determined by the following
2.5V input voltage. And a boost converter carries out
formula from PWM minimum pulse width and the
LEDs constant current drive, after starting soft start
frequency fPWM of PWM .
operation.
D PWM min [%]  0.5[  sec]  f PWM [ MHz ]  100
Soft start (SS)
When not use a dimming function, please input the
The boost converter carries the soft start function in
signal of a high level to PWM pin. If a dimming signal
order to prevent the rush current at a start up. This
which is less than 100Hz is inputted, a boost converter is
function is to raise output voltage slowly. It is because
stopped and it performs the same operation as EN. PWM
overshooting and rush current occur when input voltage
does not have restriction of an input sequence. If inputted
is inputted.
into PWM before the input of VCC, there is no problem.
Over voltage protection (OVP)
LED constant current output setup
Over voltage protection is built in. If LED is
LED current is determined by resistance connected to a
disconnecting, the output voltage of a boost converter is
REXT pin. Please use it according to the following
stopped and destruction of IC is prevented. Overvoltage
formula in the range from, 3mA/ch to 60 mA/ch.
protection voltage is internal fixation. Please connect the
VOUT (OVP) pin to a boost converter output.
1229
I LED [mA] 
 1000
R EXT
Over current protection (OCP)
LED constant current output
In order to restrict the over-current by the abnormalities
Please connect LED constant current output OUT1-6 to
of load, etc., the over-current protection circuit is built in.
the cathode of LED. The constant current is supplied to
Over current detection of pulse-by-pulse system is
LEDs decided by REXT. If the current needs more than
adopted. An output transistor is turned off if the current
60mA, please connect each output pin. If there is an LED
which flows into an output transistor reaches boost
output which is not used, please connect with GND.
converter limit current (Ilim). The output transistor
operates again in reset time in IC after that. An
over-current protection circuit detects the peak current of
Protection circuits
an inductor. Input and output voltage and not only LED
Under voltage protection lock out (UVLO)
constant current but ripple current is taken into
The UVLO function is carried in order to prevent
consideration. If 8msec or more of over current states
malfunction in the state where input voltage is low. A
continue, IC is shut down. If 8mesc or more of the over
boost converter and an LED constant current output are
current protection circuits operates, IC is shut down.
suspended to the power supply voltage which can carry
out operational stability. UVLO is released by more than
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THL6517_Rev.1.01_E
Short circuits protection (SCP)
LED open protection
If the output of a boost converter connects with GND
When an LED constant current output opens, the opened
and, OVP pin is arrived at less than 2.37V, short circuits
LED constant current output is separated from the
protection is carried out. In that case, operation of a
feedback loop, and stops. The other LED constant
boost converter is stopped. If a short state is canceled, it
current output connected continues normal operation. If
will return to normal operation.
an open state is canceled, it will return to normal
operation. If all the LED constant current outputs
become open, the output voltage of a boost converter
LED short protection
will be raised and the over voltage protection will
If LED line was shorted and the LED constant current
operate.
output OUTn reaches more than 15V, an LED constant
current output will be suspended. Even if the short state
is canceled, an LED constant current output holds a halt
Thermal shut down (TSD)
condition. The LED constant current output which does
In order to prevent destruction by heat, the thermal
not act as short continues normal operation. Short circuit
shutdown circuit is built in. If the junction temperature
of all the LED constant current outputs will stop
Tj is 125oC or more, the thermal shutdown circuit will
operation of a boost converter. If the short state is
operate and it will stop switching operation. Moreover,
canceled, it returns to normal operation. (Fig. 2)
the hysteresis of a thermal shutdown circuit is 15 oC. If
Tj falls, output voltage will retur
Normal Operation
Check if any working
channel voltage > 15V
No
Yes
Turn off this channel
No
If all channels voltage
Yes
Turn off all channels and
Reset the turn-off status
(Turn on allthe channels)
Fig. 2
LED short protection circuit function
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Package Dimensions
QFN 16-pin
Recommend connecting Back Exposed Pad with GND for a thermal characteristic improvement.
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THL6517_Rev.1.01_E
Notices and Requests
1. The product specifications described in this material are subject to change without prior notice.
2. The circuit diagrams described in this material are examples of the application which may not always apply to the
customer’s design. We are not responsible for possible errors and omissions in this material. Please note if errors or
omissions should be found in this material, we may not be able to correct them immediately.
3. This material contains our copyright, know-how or other proprietary. Copying or disclosing to third parties the
contents of this material without our prior permission is prohibited.
4. Note that if infringement of any third party's industrial ownership should occur by using this product, we will be
exempted from the responsibility unless it directly relates to the production process or functions of the product.
5. This product is presumed to be used for general electric equipment, not for the applications which require very high
reliability (including medical equipment directly concerning people's life, aerospace equipment, or nuclear control
equipment). Also, when using this product for the equipment concerned with the control and safety of the
transportation means, the traffic signal equipment, or various Types of safety equipment, please do it after applying
appropriate measures to the product.
6. Despite our utmost efforts to improve the quality and reliability of the product, faults will occur with a certain small
probability, which is inevitable to a semi-conductor product. Therefore, you are encouraged to have sufficiently
redundant or error preventive design applied to the use of the product so as not to have our product cause any social
or public damage.
7. Please note that this product is not designed to be radiation-proof.
8. Customers are asked, if required, to judge by themselves if this product falls under the category of strategic goods
under the Foreign Exchange and Foreign Trade Control Law.
9. The product or peripheral parts may be damaged by a surge in voltage over the absolute maximum ratings or
malfunction, if pins of the product are shorted by such as foreign substance. The damages may cause a smoking
and ignition. Therefore, you are encouraged to implement safety measures by adding protection devices, such as
fuses.
THine Electronics, Inc.
[email protected]
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