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BD6142AMUV
Datasheet
This section is especially mentioned here because the spec shown electrical characteristic is necessary to explain this
section.
Over voltage limit
LED control voltage
LED terminal over voltage protect
min 1.16V typ 1.20V max 1.24V
min 0.64V typ 0.80V max 0.96V
min 4.25V typ 5.00 V max 5.75V
1.
2.
3.
4.
Calculate the conditions that the total value of LED VF is MAX.
Example) In the case of serial 8 LEDs with VF=2.9V(min), 3.2V(typ), 3.5V(max) => 3.5V x 8=28V
Then calculate the biggest value of output with the following formula.
The biggest value of output = the biggest value calculated for 1 + the biggest value of LED terminal voltage. (0.96V)
Example) The biggest value of output = 28V + 0.96V =28.96V
Set the smallest value of over voltage larger than the biggest value of output.
If over voltage is closer to the total value of VF, it could be occurred to detect over voltage by ripple, noise, and so on.
It is recommended that some margins should be left on the difference between over voltage and the total value of VF.
This time around 6% margin is placed.
Example) Against the biggest value of output = 28.96V, the smallest value of over voltage = 28.96V x 1.06 = 30.70V
Ic over voltage limit min=1.16V, typ=1.20V, max=1.24V
typ = 30.70V × (1.20V/1.16V) = 31.76V
max = 31.76V × (1.26V/1.20V) = 33.35V
The below shows how to control resistor setting over voltage
Please fix resistor high between OVP terminal and output and then set over voltage after changing resistor between
OVP terminal and GND. While PWM is off, output voltage decreases by minimizing this resistor. Due to the decrease of
output voltage, ripple of output voltage increases, and singing of output condenser also becomes bigger.
Example) Selecting OVP resistor.
? OVP resistor selection
(Example. 1) VF=3.5V max, serial = 7 LED
OVP = 1.2V, R1 = 2.2M ? , R2 = 95.3k ?
VOUT = 1.2 × (2.2M ? + 95.3k ? )/ 95.3k ? = 28.90V
(Example. 2) VF=3.5V max, serial = 8 LED
OVP = 1.2V, R1 = 2.2M ? , R2 = 82k ?
VOUT = 1.2 × (2.2M ? + 82k ? )/ 82k ? = 33.40V
(Example. 3) VF=3.5V max, serial = 9 LED
OVP = 1.2V, R1 = 2.2M ? , R2 = 73.2k ?
VOUT = 1.2 × (2.2M ? + 73.2k ? )/ 73.2k ? = 37.27V
(Example. 4) VF=3.5V max, serial = 10 LED
OVP terminal
VOUT
R1
R2
OVP = 1.2V, R1 = 2.2M ? , R2 = 68k ?
VOUT = 1.2 × (2.2M ? + 68k ? )/ 68k ? = 40.02V
? External SBD open detect / Output Short protection
In the case of external SBD is not connected to IC, or VOUT is shorted to GND, the coil or internal Tr may be destructed.
Therefore, at such an error as OVP becoming 50mV(typ.) or below, turns off the output Tr, and prevents the coil and the IC
from being destructed.
And the IC changes from activation into non-activation, and current does not flow to the coil (0mA).
? Thermal shut down
This IC has thermal shut down function.
The thermal shut down works at 130 ? C (typ.) or higher, and the IC changes from activation into non-activation.
www.rohm.com
? 2011 ROHM Co., Ltd. All rights reserved.
TSZ22111 ? 15 ? 001
11/30
TSZ02201-0G3G0C400340-1-2
03.Dec.2012 Rev.001
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