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參數(shù)資料
| 型號： | TLV61224DCKT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | BATTERY CHARGE CONTROLLER, PDSO6 |
| 封裝： | GREEN, PLASTIC, SC-70, 6 PIN |
| 文件頁數(shù)： | 16/17頁 |
| 文件大?。?/td> | 769K |
| 代理商： | TLV61224DCKT |
I
L
t
200mA
(typ.)
ContinuousCurrentOperation
DiscontinuousCurrentOperation
200mA
(typ.)
TLV61224
SLVSAM7
– MARCH 2011
DETAILED DESCRIPTION
OPERATION
The TLV61224 is a high performance, high efficient boost converter. To achieve high efficiency the power stage
is implemented as a synchronous boost topology. For the power switching two actively controlled low RDSon
power MOSFETs are used.
CONTROLLER CIRCUIT
The device is controlled by a hysteretic current mode controller. This controller regulates the output voltage by
keeping the inductor ripple current constant in the range of 200 mA and adjusting the offset of this inductor
current depending on the output load. In case the required average input current is lower than the average
inductor current defined by this constant ripple the inductor current gets discontinuous to keep the efficiency high
at low load conditions.
Figure 10. Hysteretic Current Operation
The output voltage VOUT is monitored via the internal feedback network which is connected to the voltage error
amplifier. To regulate the output voltage, the voltage error amplifier compares this feedback voltage to the
internal voltage reference and adjusts the required offset of the inductor current accordingly.
Device Enable and Shutdown Mode
The device is enabled when EN is set high and shut down when EN is low. During shutdown, the converter stops
switching and all internal control circuitry is turned off. In this case the input voltage is connected to the output
through the back-gate diode of the rectifying MOSFET. This means that there always will be voltage at the output
which can be as high as the input voltage or lower depending on the load.
Startup
After the EN pin is tied high, the device starts to operate. In case the input voltage is not high enough to supply
the control circuit properly a startup oscillator starts to operate the switches. During this phase the switching
frequency is controlled by the oscillator and the maximum switch current is limited. As soon as the device has
built up the output voltage to about 1.8V, high enough for supplying the control circuit, the device switches to its
normal hysteretic current mode operation. The startup time depends on input voltage, load current and output
capacitance.
Operation at Output Overload
If in normal boost operation the inductor current reaches the internal switch current limit threshold the main
switch is turned off to stop further increase of the input current.
In this case the output voltage will decrease since with limited input current it is not possible anymore to provide
sufficient power to the output to maintain the programmed output voltage.
If the output voltage drops below the input voltage the backgate diode of the rectifying switch gets forward biased
and current starts flowing through it. This diode cannot be turned off, so the current finally is only limited by the
remaining DC resistances. As soon as the output load has decreased to a value the converter can supply, the
converter resumes normal operation providing the set output voltage.
8
Copyright
2011, Texas Instruments Incorporated
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