TLE 8366EV Infineon Technologies, TLE 8366EV Datasheet - Page 8

• Manufacturer Part Number: TLE 8366EV
• Manufacturer: Infineon Technologies

Specifications of TLE 8366EV

• Packages: PG-DSO-8
• Comment: VQ adjustable from 0.6V up to 16V; Tolerance 2% up to 1000mA; DSO-8 EP
• Vq (max): adjustable
• Iq (max): 1,800.0 mA
• Iq (typ): 7,000.0 µA
• Output: Buck Converter

An internal temperature sensor detects the temperature of the device, it will be switched off if the junction
temperature exceeds 175 °C.
The error Flip flop is set by the Schmitt Trigger 1 and will be reset by one of these signals. This will close the NOR1
gate and shutdown the pulse. The bootstrap capacitor monitoring is connected directly to the NOR1 gate.
The bootstrap under-voltage shutdown is created by the BDS UV comparator, which compares the bootstrap
capacitor voltage to a reference level. If the bootstrap capacitor voltage is too low, the pulse will be shut down.
PWM pulses are passing through the NOR 1 gate. In case if one of the mentioned failures will occur this gate will
be closed and the pulse switched immediately off.
The PWM Flip-Flop is set by NAND2, which combines the clock from the Schmitt Trigger 1 with the output from
NOR1. The PWM Flip-Flop is reset by the output of the NOR1.
5.1.1.3
The gate driver consists of the Gate driver itself, an inverter for the PWM signal and the gate driver supply. The
gate Driver Supply is connected over pin BDS to the BDS capacitor. A charge pump is integrated to support the
gate drive in cases of low input voltage, small differential voltage between input supply and output voltage and
during start up. To minimize emissions the charge pump is switched off if the input voltage is high enough to charge
the bootstrap capacitor.
5.1.2
The PWM pulses are voltage controlled. The error amplifier and the PWM comparator are creating the PWM
pulses using the oscillator saw-tooth signal and the feedback voltage. The pulse-width modulation is done so that
the feedback voltage (at pin FB for the adjustable version) is similar to the reference voltage (0.6 V).
Between input voltages from 8.0 to 36 V the integrated feed forward path provides a fast line transient rejection.
(feed-forward means sensing the input voltage and react on fluctuations before they influence the output)
To achieve a stable output voltage even under low duty cycle conditions (light load down to zero output load and/or
high input voltage) a pulse skipping mode is implemented. Pulse skipping is also used for operation with low supply
voltages leading to duty cycles > 92%.
Data sheet
Internal Power Stage
Operation Mode
8
Rev. 1.0, 2009-05-18
Buck Regulator
TLE8366