參數(shù)資料
型號(hào)： TPS54623RHLT
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： 15 A SWITCHING REGULATOR, 1760 kHz SWITCHING FREQ-MAX, PQCC14
封裝： 3.50 X 3.50 MM, GREEN, PLASTIC, QFN-14
文件頁數(shù)： 6/35頁
文件大?。?/td> 1468K
代理商： TPS54623RHLT
Fsw Oscillator Frequency kHz
0
50
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200
400
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800
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1200
1400
1600
R
T
Resistance
k
RT/CLK
TPS54622
Rrt
RT/CLK
mode select
TPS54623
Css(nF)
Vref(V)
Tss(ms) =
Iss( A)
m
SLVSB09
– SEPTEMBER 2011
Figure 22. RT Set Resistor vs Switching Frequency
Synchronization (CLK mode)
An internal Phase Locked Loop (PLL) has been implemented to allow synchronization between 200kHz and
1600kHz, and to easily switch from RT mode to CLK mode.
To implement the synchronization feature, connect a square wave clock signal to the RT/CLK pin with a duty
cycle between 20% to 80%. The clock signal amplitude must transition lower than 0.8V and higher than 2.0V.
The start of the switching cycle is synchronized to the falling edge of RT/CLK pin.
In applications where both RT mode and CLK mode are needed, the device can be configured as shown in
Figure 23. Before the external clock is present, the device works in RT mode and the switching frequency is set
by RT resistor. When the external clock is present, the CLK mode overrides the RT mode. The first time the
SYNC pin is pulled above the RT/CLK high threshold (2.0V), the device switches from the RT mode to the CLK
mode and the RT/CLK pin becomes high impedance as the PLL starts to lock onto the frequency of the external
clock. It is not recommended to switch from the CLK mode back to the RT mode because the internal switching
frequency drops to 100kHz first before returning to the switching frequency set by RT resistor.
Figure 23. Works with Both RT mode and CLK mode
Slow Start (SS/TR)
The device uses the lower voltage of the internal voltage reference or the SS/TR pin voltage as the reference
voltage and regulates the output accordingly. A capacitor on the SS/TR pin to ground implements a slow start
time. The device has an internal pull-up current source of 2.3
μA that charges the external slow start capacitor.
The calculations for the slow start time (Tss, 10% to 90%) and slow start capacitor (Css) are shown in
Equation 5. The voltage reference (Vref) is 0.8 V and the slow start charge current (Iss) is 2.3
μA.
(5)
14
Copyright
2011, Texas Instruments Incorporated
Product Folder Link(s) :TPS54623
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