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參數(shù)資料
| 型號(hào)： | LTC1705 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Dual 550kHz Synchronous Switching Regulator Controller with 5-Bit VID and 150mA LDO |
| 中文描述： | 雙550kHz的同步開關(guān)，5位VID和150mA LDO穩(wěn)壓器控制器 |
| 文件頁數(shù)： | 20/28頁 |
| 文件大?。?/td> | 326K |
| 代理商： | LTC1705 |
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LTC1705
20
and the actual MOSFETs, inductor and input and output
capacitors that the final design will use. This breadboard
should use appropriate construction techniques for high
speed analog circuitry: bypass capacitors located close to
the LTC1705, no long wires connecting components,
appropriately sized ground returns, etc. Wire the feedback
amplifier as a simple Type 1 loop, with a 10k resistor from
V
OUT
to FB and a 0.1
μ
F feedback capacitor from COMP to
FB. Choose the bias resistor (R
B
) as required to set the
desired output voltage. Disconnect R
B
from ground and
connect it to a signal generator or to the source output of
a network analyzer (Figure 9) to inject a test signal into the
loop. Measure the gain and phase from the COMP pin to
the output node at the positive terminal of the output
capacitor. Make sure the analyzer’s input is AC coupled so
that the DC voltages present at both the COMP and V
OUT
nodes don’t corrupt the measurements or damage the
analyzer.
*1705 modulator gain/phase
*2000 Linear Technology
*this file written to run with PSpice 8.0
*may require modifications for other
SPICE simulators
*MOSFETs
rfet mod sw 0.02
;MOSFET rdson
*inductor
lext sw out1 1u
rl out1 out 0.005
;inductor value
;inductor series R
*output cap
cout out out2 1000u
resr out2 0 0.01
;capacitor value
;capacitor ESR
*1705 internals
emod mod 0 comp 0 5
vstim comp 0 0 ac 1
.ac dec 100 1k 1meg
.probe
.end
With the gain/phase plot in hand, a loop crossover fre-
quency can be chosen. Usually the curves look something
like Figure 5. Choose the crossover frequency in the rising
or flat parts of the phase curve, beyond the external LC
poles. Frequencies between 10kHz and 50kHz usually
work well. Note the gain (GAIN, in dB) and phase (PHASE,
in degrees) at this point. The desired feedback amplifier
gain will be -GAIN to make the loop gain at 0dB at this
frequency. Now calculate the needed phase boost, assum-
ing 60
°
as a target phase margin:
BOOST = –(PHASE + 30
°
)
If the required BOOST is less than 60
°
, a Type 2 loop can
be used successfully, saving two external components.
BOOST values greater than 60
°
usually require Type 3
loops for satisfactory performance.
;3.3 for 3.3V supply
;ac stimulus
APPLICATIU
W
U
U
Figure 9. Modulator Gain/Phase Measurement Set Up
BOOST
1
μ
F
0.1
μ
F
MBR0530T
TG
SW
BG
PGND
PV
CC
GND
V
CC
10
AC SOURCE
FROM
ANALYZER
LTC1705
10
μ
F
QB
L
+
C
OUT
1705 F09
V
TO
ANALYZER
V
TO
ANALYZER
R
B
5V
+
RUN/SS
NC
QT
FB
COMP
10k
If breadboard measurement is not practical, a SPICE
simulation can be used to generate approximate gain/
phase curves. Plug the expected capacitor, inductor and
MOSFET values into the following SPICE deck and gener-
ate an AC plot of V(V
OUT
)/V(COMP) in dB and phase of
V
OUT
in degrees. Refer to your SPICE manual for details of
how to generate this plot.
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