參數(shù)資料
型號(hào)： TLE6361G
廠商： INFINEON TECHNOLOGIES AG
元件分類： 穩(wěn)壓器
英文描述： SWITCHING REGULATOR, 425 kHz SWITCHING FREQ-MAX, PDSO36
封裝： POWER, PLASTIC, SO-36
文件頁(yè)數(shù)： 57/57頁(yè)
文件大小： 1986K
代理商： TLE6361G
TLE 6361 G
Data Sheet, Rev. 2.0
9
2005-03-01
the gate driver supply is managed by the combination of internal charge pump, external
charge pump and bootstrap capacitor.
2.1.1
Current mode control scheme
The regulation loop is located at the left lower corner in the schematic, there you find the
voltage feedback amplifier which gives the actual information of the actual output voltage
level and the current sense amplifier for the load current information to form finally the
regulation signal. To avoid subharmonic oscillations at duty cycles higher than 50% the
slope compensation block is necessary.
The control signal formed out of those three blocks is finally the input of the PWM
regulator for the DMOS gate turn off command, which means this signal determines the
duty cycle. The gate turn on signal is set by the oscillator periodically every 3s which
leads to a Buck converter switching frequency around 330kHz.
With decreasing input voltage the device changes to the so called pulse skipping mode
which means basically that some of the oscillator gate turn off signals are ignored. When
the input voltage is still reduced the DMOS is turned on statically (100% duty cycle) and
its gate is supplied by the internal charge pump. Below typical 4.5V at the feedback pin
the device is turned off.During normal switching operation the gate driver is supplied by
the bootstrap capacitor.
2.1.2
Start-up procedure
To guarantee a device startup even under full load condition at the linear regulator
outputs a special start up procedure is implemented. At first the bootstrap capacitor is
charged by the internal charge pump. Afterwards the outpuput capacitor is charged
where the driver supply in that case is maintained only by the bootstrap capacitor. Once
the output capacitor of the buck converter is charged the external charge pump is
activated being able to supply the linear regulators and finally the linear regulators are
released to supply the loads.
2.1.3
Reduction of electromagnetic emission
In figure 3 it is recognized that two internal DMOS switches are used, a main switch and
an auxiliary switch. The second implemented switch is used to adjust the current slope
of the switching current. The slope adjustment is done by a controlled charge and
discharge of the gate of this DMOS. By choosing the external slew resistor appropriate
the current transition time can be adjusted between 20ns and 100ns.
2.1.4
Reducing the switching losses
The second purpose of the slope DMOS is to minimise the switching losses. Once being
in freewheeling mode of the buck regulator the output voltage level is sufficient to force
the load current to flow, the input voltage level is not needed in the first moment. By a
feedback network consisting of a resistor and a diode to the boost pin (connection see
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