參數(shù)資料
型號(hào)： LTC1704EGN#TRPBF
廠商： Linear Technology
文件頁(yè)數(shù)： 20/28頁(yè)
文件大?。?/td> 347K
描述： IC REG DL BUCK/LINEAR 16SSOP
標(biāo)準(zhǔn)包裝： 2,500
拓?fù)洌?/td> 降壓（降壓）（1），線性（LDO）（1）
功能： 任何功能
輸出數(shù)： 2
頻率 - 開(kāi)關(guān)： 550kHz
電壓/電流 - 輸出 1： 控制器
電壓/電流 - 輸出 2： 控制器
帶 LED 驅(qū)動(dòng)器： 無(wú)
帶監(jiān)控器： 無(wú)
帶序列發(fā)生器： 無(wú)
電源電壓： 3.15 V ~ 5.5 V
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 16-SSOP（0.154"，3.90mm 寬）
供應(yīng)商設(shè)備封裝： 16-SSOP
包裝： 帶卷 (TR)
LTC1704/LTC1704B
20
1704bfa
APPLICATIO S I FOR ATIO
U
U
U
Feedback Component Selection
Selecting the R and C values for a typical Type 2 or Type
3 loop is a nontrivial task. The applications shown in this
data sheet show typical values, optimized for the power
components shown. They should give acceptable perfor-
mance with similar power components, but can be way
off if even one major power component is changed
significantly. Applications that require optimized tran-
sient response will need to recalculate the compensation
values specifically for the circuit in question. The under-
lying mathematics are complex, but the component
values can be calculated in a straightforward manner if
we know the gain and phase of the modulator at the
crossover frequency.
Modulator gain and phase can be measured directly from
a breadboard, or can be simulated if the appropriate para-
sitic values are known. Measurement will give more accu-
rate results, but simulation can often get close enough to
give a working system. To measure the modulator gain and
phase directly, wire up a breadboard with an LTC1704 and
the actual MOSFETs, inductor, and input and output capaci-
tors that the final design will use. This breadboard should
use appropriate construction techniques for high speed
analog circuitry: bypass capacitors located close to the
LTC1704, no long wires connecting components, appro-
priately sized ground returns, etc. Wire the feedback am-
plifier as a simple Type 1 loop, with a 10k resistor from
V
OUTSW
 to FB and a 0.1礔 feedback capacitor from COMP
to FB. Choose the bias resistor (R2) as required to set the
desired output voltage. Disconnect R2
 
from ground and
connect it to a signal generator or to the source output of
a network analyzer (Figure 11) 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 ca-
pacitor. Make sure the analyzers input is AC coupled so that
the DC voltages present at both the COMP and V
OUTSW
nodes dont corrupt the measurements or damage the
analyzer.
Figure 11. Modulator Gain/Phase Measurement Setup
BOOST
1礔
0.1礔
MBR0530T
TG
SW
BG
PGND
PV
CC
GND
V
CC
10&
AC SOURCE
FROM
ANALYZER
LTC1704
10礔
QB
L
+
C
OUT
1704 F11
V
OUTSW
 TO
ANALYZER
V
COMP
 TO
ANALYZER
R2
5V
+
RUN/SS   NC
QT
FB
COMP
10k
Figure 9. Type 2 Schematic and Transfer Function
Figure 10. Type 3 Schematic and Transfer Function
1704 F10
0
PHASE
6dB/OCT
+6dB/OCT  6dB/OCT
GAIN
FREQ
90
180
270
360
R2
V
REF
R1
R4
FB
C2
IN
COMP
+

C1
C3
R3
1704 F09
0
PHASE
6dB/OCT
6dB/OCT
GAIN
FREQ
90
180
270
360
R2
V
REF
R1
R4
FB
C2
IN
COMP
+

C1
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
OUTSW
)/V(COMP) in dB and phase of
V(OUTSW) in degrees. Refer to your SPICE manual for
details of how to generate this plot.
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