Hi Masami,
After some bench test, we think the shut-down is caused by the voltage on BP5 lower than its threshold. After the TPS40192 shuts down, BP5 voltage will bounce back above the threshld again because the IR drop from Vdd to BP5 disappears, and…
Hi Aaron,
Yes, you are right that the high-side FET short circuit threshold is fixed. So if increasing the low-side FET SCP threshold does not help, it could be due to the high-side SCP.
If increasing the BOOT resistor can make a difference, it also…
Other Parts Discussed in Thread: TPS40192 Hi,
There is an question from customer side. The output voltage is not requlated normally when EN pin is tied to the external voltage 18V. In the D/S, the absolute max. voltage can be up to 20V. So it means…
Danilo,
As you note, the soft-start sequence for the TPS40192 is not going to support PWM dimming via the Enable pin well, however there are a couple of other possibilities:
1) Provide a pull-up on the FB pin such that the programmed LED current…
Other Parts Discussed in Thread: TPS40192TPS40192/93 symbol in SwitcherPro schematic incorrectly shows pin 5 as GND when it should be PowerGood. Also, pin 11 which is the PowerPad ground is not shown.
Thanks,
Allen
Hi, Marco
1. I think your idea is not practical.
2. Suggest to use a higher current devices:
Integrated power FET: TPS544B20 or TPS544B25.
External power FET: TPS40192 or LM3000.
Other Parts Discussed in Thread: CSD16410Q5A , TPS40192 I just created a buck-regulator design using the TPS40192, using one each of CSD16410Q5A, which has Ron=10mOhm@4.5V , for high and low-sides.
I_rms(Q1) was calculated to be 4.05A. The Q1 (high…
The TPS40192/3/5 enable pin is active high with an internal pull-up (1.5MOhm) to VDD.
The EN pin has an internal clamp of approximately 2V when the IC is enabled and needs a minimum 1uA of current to remain active.
The EN pin can be driven active…
Yeah, I saw this article and it does provide some information but I noticed a couple things made we want to look further.
Equation 5 shows calculations for the high side FET using TPS40192.
1. 12V was selected for Vdrive but the datasheet shows absolute…
