⚠ Warning: The resistor R1 is below the recommended 75 Ohm safety value.
If the R1 resistance is below this value an overcurrent in the output stage can occur if the supply voltage is very high (e.g. 20V – 40V).
A small resistance could be used if high voltage can be avoided in the application. For further details see the power shift Application Note Ch. 4.
PV(max) = ( TJ(max) - TA ) / RthJA
PV(max) = ( 0 °C - 0 °C ) / 0 Ω
PV(max) = 0 W
RSET = ( VIN_SET / IOUT ) ⋅ k0 (use k2 if IOUT > 0 mA, otherwise use k1)
RSET = ( 0 V / 0 mA ) ⋅ 0
RSET = 0 kΩ
R
1 =
0 Ω
(calculation steps described here)
R
2 =
0 Ω
(calculation steps described here)
CFG Setting = GND (GND if IOUT > 0 mA, otherwise open)
Output CFG = OUTH (OUTH if IOUT > 0 mA, otherwise OUTL)
PR1(max) = max { PR10, ... , PR120 } = PR10 = 0 W
PR2(max) = max { PR20, ... , PR220 } = PR20 = 0 W
PTLD1114(max) = max { PTLD11140, ... , PTLD111420 } = PTLD11140 = 0 W
IOUT(max) = max { IOUT0, ... , IOUT20 } = IOUT0 = 0 mA
In the next steps the system behavior is calculated at multiple supply voltage levels between VS(min) & VS(max) and for different maximum power shift currents.
The calculation searches the optimized resistances R1 and R2 for the power shift feature.
This is done by allowing the maximum power dissipation in the TLD1114 device to be as close as possible to PV(max) to exploit the full thermal capability of the TLD1114 LED driver and thus reducing the external component effort.
Additionally a crosscheck of the result is done to see whether the target current can be driven under the given application conditions (e.g. temperature and voltages) without overheating.
In the next steps the system behavior is calculated at multiple supply voltage levels between VS(min) & VS(max) and for different maximum power shift currents.
The calculation searches the optimized resistance R1 for the power shift feature.
This is done by allowing the maximum power dissipation in the TLD1114 device to be as close as possible to PV(max) to exploit the full thermal capability of the TLD1114 LED driver and thus reducing the external component effort.
Additionally a crosscheck of the result is done to see whether the target current can be driven under the given application conditions (e.g. temperature and voltages) without overheating.
VS interpolation range = [ max{ VS(min), VOUT + VPS_CC }, VS(max) ]
VS interpolation range = [ max{ 0 V, 0 V + 0 V }, 0 V ]
VS interpolation range = [ 0 V, 0 V ]
RSHUNT = 0 Ω (0.75 Ω if IOUT > 0 mA, otherwise 1.5 Ω)