參數(shù)資料
型號(hào)： CS5165AGDWR16
英文描述： Analog IC
中文描述： 模擬IC
文件頁(yè)數(shù)： 5/20頁(yè)
文件大?。?/td> 529K
代理商： CS5165AGDWR16
CS5160
http://onsemi.com
13
The circuit that implements this function is shown in
Figure 19.
Figure 19. Small RC Filter Provides the
Proper Voltage Ramp at the Beginning of
each On–Time Cycle
To Synchronous
FET
16
VOUT
12
C1
R2
R1
CS5160
GATE(L)
COMP
CCOMP
The ramp waveform is generated through a small RC filter
that provides the proper voltage ramp at the beginning of
each on–time cycle. The resistors R1 and R2 in the circuit of
Figure 14 form a voltage divider from the GATE(L) output,
superimposing a small artificial ramp on the output of the
error amplifier. It is important that the series combination
R1/R2 is high enough in resistance not to load down and
negatively affect the slew rate on the GATE(L) pin.
Selecting External Components
The CS5160 can be used with a wide range of external
power components to optimize the cost and performance of
a particular design. The following information can be used
as general guidelines to assist in their selection.
NFET Power Transistors
Both logic level and standard MOSFETs can be used. The
reference designs derive gate drive from the 12 V supply
which is generally available in most computer systems and
utilize logic level MOSFETs. Multiple MOSFETs may be
paralleled to reduce losses and improve efficiency and
thermal management.
Voltage applied to the MOSFET gates depends on the
application circuit used. Both upper and lower gate driver
outputs are specified to drive to within 1.5 V of ground when
in the low state and to within 2.0 V of their respective bias
supplies when in the high state. In practice, the MOSFET
gates will be driven rail to rail due to overshoot caused by the
capacitive load they present to the controller IC. For the
typical application where VCC1 = VCC2 = 12 V and 5.0 V is
used as the source for the regulator output current, the
following gate drive is provided;
VGATE(H) + 12 V * 5.0 V + 7.0 V, VGATE(L) + 12 V
(see Figure 20.)
Figure 20. CS5160 Gate Drive Waveforms Depicting
Rail to Rail Swing
M 1.00
s
Math 1 = VGATE(H) – 5.0 VIN
Trace 3 = VGATE(H) (10 V/div.)
Trace 4 = VGATE(L) (10 V/div.)
Trace 2= Inductor Switching Nodes (5.0 V/div.)
The most important aspect of MOSFET performance is
RDSON, which effects regulator efficiency and MOSFET
thermal management requirements.
The power dissipated by the MOSFETs may be estimated
as follows;
Switching MOSFET:
Power
+ ILOAD2
RDSON
duty cycle
Synchronous MOSFET:
Power
+ ILOAD2
RDSON
(1
* duty cycle)
Duty Cycle =
VOUT ) (ILOAD
RDSON OF SYNCH FET)
VIN)(ILOAD
RDSON OF SYNCH FET)
* (ILOAD
RDSON OF SWITCH FET)
Off Time Capacitor (COFF)
The COFF timing capacitor sets the regulator off time:
TOFF + COFF
4848.5
The preceding equations for duty cycle can also be used
to calculate the regulator switching frequency and select the
COFF timing capacitor:
COFF +
Perioid
(1
* duty cycle)
4848.5
where:
Period
+
1
switching frequency
相關(guān)PDF資料
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
CS5165AGDWR16G 功能描述:DC/DC 開(kāi)關(guān)控制器 ANA BUCK SYNC 5BIT CNTRLR RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
CS-5165DW16 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Voltage-Mode SMPS Controller
CS-5165DWR16 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Voltage-Mode SMPS Controller
CS-5165HDW16 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Voltage-Mode SMPS Controller
CS-5165HDWR16 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Voltage-Mode SMPS Controller
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