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參數(shù)資料
| 型號： | LTC4090EDJC#TRPBR |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO22 |
| 封裝： | 6 X 3 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, MO-229WXXX, DFN-22 |
| 文件頁數(shù)： | 14/28頁 |
| 文件大?。?/td> | 392K |
| 代理商： | LTC4090EDJC#TRPBR |
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LTC4090
21
4090f
Figure 5. Transient Load Response of the LTC4090 High Voltage
Regulator Front Page Application as the Load Current is Stepped
from 500mA to 1500mA.
Figure 6. High Voltage Regulator Burst Mode Operation
pensation. In particular, the high voltage regulator does
not require the ESR of the output capacitor for stability,
so you are free to use ceramic capacitors to achieve low
output ripple and small circuit size. Frequency compensa-
tion is provided by the components tied to the VC pin, as
shown in Figure 1. Generally a capacitor (CC) and a resistor
(RC) in series to ground are used. In addition, there may
be a lower value capacitor in parallel. This capacitor (CF)
is not part of the loop compensation but is used to lter
noise at the switching frequency, and is required only if
a phase-lead capacitor is used or if the output capacitor
has high ESR.
Loop compensation determines the stability and transient
performance. Designing the compensation network is a bit
complicated and the best values depend on the application
and in particular the type of output capacitor. A practical
approach is to start with the front page schematic and tune
the compensation network to optimize performance. Stabil-
ity should then be checked across all operating conditions,
including load current, input voltage and temperature. The
LTC1375 datasheet contains a more thorough discussion
of loop compensation and describes how to test the sta-
bility using a transient load. Figure 5 shows the transient
response when the load current is stepped from 500mA
to 1500mA and back to 500mA.
Low Ripple Burst Mode Operation
To enhance efciency at light loads, the LTC4090 can be
operated in low ripple Burst Mode operation which keeps
the output capacitor charged to the proper voltage while
minimizing the input quiescent current. During Burst Mode
operation, the LTC4090 delivers single cycle bursts of
current to the output capacitor followed by sleep periods
where the output power is delivered to the load by the
output capacitor. Because the LTC4090 delivers power to
output with single, low current pulses, the output ripple
is kept below 15mV for a typical application. As the load
current decreases towards a no load condition, the per-
centage of time that the high voltage regulator operates
in sleep mode increases and the average input current is
greatly reduced resulting in high efciency even at very
low loads. See Figure 6.
At higher output loads (above 140mA for the front page
application) the LTC4090 will be running at the frequency
programmed by the RT resistor, and will be operating in
standard PWM mode. The transition between PWM and
low ripple Burst Mode operation is seamless, and will not
disturb the output voltage.
APPLICATIONS INFORMATION
Figure 7. To Soft-Start the High Voltage Regulator, Add a Resistor
and Capacitor to the HVEN Pin
20
μs/DIV
HVOUT
50mV/DIV
IL
0.5A/DIV
4090 F05
FIGURE 12 SCHEMATIC
4090 F06
IL
0.5A/DIV
VSW
5V/DIV
VOUT
10mV/DIV
5
μs/DIV
VIN = 12V; FIGURE 12 SCHEMATIC
ILOAD = 10mA
4090 F07
IL
1A/DIV
VRUN/SS
2V/DIV
VOUT
2V/DIV
HVEN
GND
0.22
μF
RUN
15k
2ms/DIV
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