OUT_SET pin mirrors the IIN_SET current set by the external resistor RSET. Any change on the IIN_SET current will be mirrored to the OUT_SET pin.PWM m...
OUT_SET pin mirrors the IIN_SET current set by the external resistor RSET. Any change on the IIN_SET current will be mirrored to the OUT_SET pin.
PWM may be applied in two different ways in an application.
PWM via PWMI-pin When PWM is applied via PWM-pin of the first IC only, this will not be propagated to the second and subsequent ICs. Reason is that the IN_SET current is not affected by the PWMI-pin status and will remain stable during the deactivation phase of the PWM. Therefore, the second IC channels will be constantly active while the first IC channel will operate in PWM. In this case, we have to apply the same PWM to the PWMI-pin of all the ICs in the application.
PWM via IN_SET-pin When PWM is applied via IN_SET pin of the first IC only, this will be propagated to the second and subsequent ICs. IN_SET current will change according to the PWM and those changes will be mirrored to the OUT_SET pin and therefore will be propagated to the second IC.
IN_SET to OUT_SET activation and deactivation delay times have to be considered for a synchronized result (P_6.6.10, P_6.6.11).
With LITIX Power boost controllers it is possible to implement a delay and fade-in / fade-out functions without using a microcontroller.This can be do...
With LITIX Power boost controllers it is possible to implement a delay and fade-in / fade-out functions without using a microcontroller.
This can be done by using filters with different time constant at the SET pin. The SET pin is the analog adjustment input and it is used to control the output current. One of the filters needs to be switchable.
In the example below
Filter 1 is a low pass filter that enables and disables the output current with a defined delay by closing or opening the MOSFET Filter 2 is a low pass filter that enables the fade-in/fade-out function.
ERRN status remains low when the fault is present on the output even during the IN_SET de-activation time (IN_SET open via uC).This happens because ER...
ERRN status remains low when the fault is present on the output even during the IN_SET de-activation time (IN_SET open via uC). This happens because ERRN status depends only on the OUTx and EN/DEN voltages. It doesn't depend on any change of resistive load at IN_SET. When a fault (OL/SC) occurs the IN_SET regulation turns off: VIN_SET goes to GND after tfault and D charge phase. Open load:
Hi everyoneI am looking at playing around with the TLD5099. I realise its aimed at LED drivers but I would like to make small DC-DC power supplies. A ...
I am looking at playing around with the TLD5099. I realise its aimed at LED drivers but I would like to make small DC-DC power supplies. A boost converter
There are many appboards to take inspiration from and I would like to discuss the operation of the IC to be sure I understand it
If we consider a boost topology then theres a boost inductor which connects to a switch and the IC measures the output voltage and adjusts the duty cycle in order to maintain the output voltage which you set via a potential divider.
Lets assume we set the voltage to a maximum of 40V, the IC will switch current through the inductor and genreate the boost voltage
My question relates to the dimming, If the enable/pwm pin is pulled high then there is no PWM dimming of the output the current will be limited by a shunt resistor, when the voltage exceeds 300mv the IC will switch off the boost switching
So I could use that as a current limit in a DC boost configuration
Does the PWM dimming affect the boost switching? i.e if I set the output voltage to 40V with a 1ohm feedback resistor then if the load draws less than 300mA I would measure the full 40V across the load?
The IC reached its voltage limit so the amount of current depends on the load impedance, is that correct?
If I increase the load current the the IC will adjust the voltage so that the maximum limit is maintained
But if I add PWM dimming then that seems to chop the current/voltage that comes from the boost output i.e it will be the full 40V but the output is chopped separately is this correct?
Does the PWM dimming affect the switching of the boost switch or are they completely independant
I would like to have a boost circuit to charge a battery and with external measurements I could use the PWM dimming to tail off the charging current and use software to have different charging profiles etc
If theres any detailed explanation of how the IC works it would be appreciated, the data sheet has confused me a little
The minimum current of LITIX™ Basic+ is limited by the IN_SET output activation current, IIN_SET(ACT) (data sheet parameter P_6.2.2): IOUTmin = IIN_SE...
The minimum current of LITIX™ Basic+ is limited by the IN_SET output activation current, IIN_SET(ACT) (data sheet parameter P_6.2.2): IOUTmin = IIN_SET(ACT) * k
1-channel ICs (TLD2132-1EP, TLD2142-1EP): IOUTmin = IIN_SET(ACT) * k = 15uA * 900 = 13.5 mA
3-channel ICs (TLD2131-3EP, TLD2331-3EP, TLD2141-3EP): IOUTmin = IIN_SET(ACT) * k = 15uA * 300 = 4.5 mA
2-channel IC (TLD2252-2EP): Channel 1 IOUTmin = IIN_SET(ACT) * k = 15uA * 300 = 4.5 mA, Channel 2 IOUTmin = IIN_SET(ACT) * k = 15uA * 600 = 9 mA
Note: For TLD2132-1EP, TLD2131-3EP and TLD2331-3EP, the Single LED Short detection needs to be taken into consideration. The minimum specified IN_SET current of KSLS_REF is 50uA (data sheet parameter P_7.5.13). This means that for applications where SLS detection is required, the output current is IOUT = 50uA * 300 = 15 mA. In case SLS detection is not required, the minimum output current depends on the IIN_SET(ACT) only and is IOUT = 4.5 mA
Note: For applications where a lower output current is required, it is possible to use PWM signal in order to achieve a significantly lower average output current, IOUT. For example, one can set the IOUT at 30mA (via RSET) and with use of PWM with duty cycle of 7% to achieve a lower average output current IOUT=2mA