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參數資料
| 型號： | TLE6361G |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 元件分類： | 穩壓器 |
| 英文描述： | SWITCHING REGULATOR, 425 kHz SWITCHING FREQ-MAX, PDSO36 |
| 封裝： | POWER, PLASTIC, SO-36 |
| 文件頁數： | 57/57頁 |
| 文件大小： | 1986K |
| 代理商： | TLE6361G |
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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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| TLE6361GNUMA1 | 制造商:Infineon Technologies AG 功能描述:Multi Voltage Processor Power Supply 36-Pin DSO 制造商:Infineon Technologies AG 功能描述:DC/DC CONVERTER - Tape and Reel 制造商:Infineon Technologies AG 功能描述:IC REG BUCK ADJ 1.5A QUAD PDSO36 |
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| TLE6363G | 功能描述:IC REG BUCK BST ADJ 0.2A PDSO14 RoHS:否 類別:集成電路 (IC) >> PMIC - 穩壓器 - DC DC 開關穩壓器 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:1 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數:1 輸出電壓:3.3V 輸入電壓:4.5 V ~ 24 V PWM 型:- 頻率 - 開關:- 電流 - 輸出:125mA 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 包裝:Digi-Reel® 供應商設備封裝:SOT-6 其它名稱:MAX1836EUT33#TG16DKR |
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