Part Number: TPS61185
Hi,
We got a question from customer about TPS61185. Could you help us?
[Question] Our customer measured Vin transient response. They expected the IC regulate LED current during Vin transient. But the result is not. Please see attached…
Hi Tatoe,
First, I think your test result is correct to TPS61185 behavior. Below is the machnism for each action.
1. If all IFB pins are open, the Boost will keep switching until clamp voltage setting by resistor divider on OVP pin.
2. If Vout reaches…
Other Parts Discussed in Thread: TPS61185 HI Sirs:
Our customer change backlight LED to this type, which seams like 1 string but need 175mA,
Can I connect IFB1~IFB8 together then connect to K(-)?
Hello Sir:
from the datasheet, the typical on time is 5us, what's the minimum on time?
can I setting the on time of dimming cycle less than 5us?
thanks.
Other Parts Discussed in Thread: TPS61185 Hi,
My customer has question about TPS61185. Could you tell me about questoin?
[Question] Is there thermal data in close to under the following condition?
- Condition - Vin=6V, 11V, 21V LED=9S8P Iled=20mA/ch fsw=1.2…
Other Parts Discussed in Thread: TPS61185 Hi,
My customer has questions about TPS61185. Could you tell me about questoin?
[Question] - How much is the shutdown current(Isd) at Ta=0 to 50 degree C? - If EN pin and PWM pin is OPEN, will each pin be Low? How…
Other Parts Discussed in Thread: TPS61185 Dear Sir,
Regarding to the TPS61185 8 ch LED driver, since the OVP is set by external divided resistor if the divided resistor was opened would it be protected by the other mechanism??
Thanks.
Hi Yue,
Let's take a simple calculation: Iin_avg=(Vout*Iout)/Vin/Efficiency={(3.1*10+0.2)*0.15*2}/12/0.85=0.92A. Considering the current ripple, it may trigger the internal current limit(1.2A typical). I think there will be some risk for this appication…
