Infineon Designer powered by TinaCloud

Automotive Linear Voltage Regulator LDO TLF4277-2LD for Active Antenna Supplies: reverse polarity protection

Open online SPICE simulator circuit link: atv_LDO_TLF4277-2LD_v1p1_reverse_polarity.TSC


Low Drop Out Linear Voltage Regulator TLF4277-2LD
Protection Features: Reverse polarity protection

The resistor divider for a specific output voltage can
be calculated as follows:
VQ = ((R1+R2)/R2)*Vref_int
therefore R1 = ((VQ/Vref_int)-1)*R2
For this model, Vref_int = 1.2 V and R2 < 27 kΩ

For VQ_max = 20 V and R1_max = 9*R2_max
therefore R1_max < 243 kΩ

The typical value of Vref_int is specified as typical 1.19 V in
the datasheet, but should be tweaked to actual simulated
value in the design parameters for accurate results.

Thermal model description:
Thermal Model = 4: JEDEC 1s0p, 600mm2 cooling area
Thermal Model = 5: JEDEC 1s0p, footprint
Thermal Model = 6: JEDEC 2s2p
Thermal Model = 7: No self-heating, only TEMP value used as temperature

Model performance:
- dynamic behavior partially modelled
- loop behavior is idealized
- the thermal simulations represent an approximation of the actual thermal
behavior of the device according to the JEDEC standards at Power = 2.55 Watts
and Temperature = 85 °C

The TLF4277-2LD is the ideal companion IC to supply active antennas for car
infotainment applications. The adjustable output voltage makes the TLF4277-2LD
capable of supplying the majority of standard active antennas such as: FM/AM,
DAB, XM and SIRIUS.

The TLF4277-2LD is a monolithic integrated low drop out voltage regulator
capable of supplying loads up to 300 mA. TLF4277-2LD provides an adjustable
output voltage in a range from 5 V up to 12 V. The integrated current
monitor function is a unique feature that provides diagnosis and system
protection functionality.

Via the enable function the IC can be disabled to lower the power consumption.

Other circuits

Technical Assistance
Voltage Regulator Finder
Product info: TLF4277-2LD