参数资料
型号: LTC1702IGN#TRPBF
厂商: Linear Technology
文件页数: 21/36页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM VM 24-SSOP
标准包装: 2,500
系列: PolyPhase®
PWM 型: 电压模式
输出数: 2
频率 - 最大: 750kHz
占空比: 93%
电源电压: 3 V ~ 7 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 85°C
封装/外壳: 24-SSOP(0.154",3.90mm 宽)
包装: 带卷 (TR)
LTC1702
APPLICATIO N S I N FOR M ATIO N
feedback amplifier, on the other hand, gives us a handle
with which to adjust the AC response. The goal is to have
180 ° phase shift at DC (so the loop regulates) and some-
thing less than 360 ° phase shift at the point that the loop
gain falls to 0dB. The simplest strategy is to set up the
feedback amplifier as an inverting integrator, with the 0dB
frequency lower than the LC pole (Figure 9). This “type 1”
configurationisstablebuttransientresponsewillbeless
than exceptional if the LC pole is at a low frequency.
Figure 10 shows an improved “type 2” circuit that uses an
additional pole-zero pair to temporarily remove 90 ° of
phase shift. This allows the loop to remain stable with 90 °
more phase shift in the LC section, provided the loop
reaches 0dB gain near the center of the phase “bump.”
GAIN
(dB)
A V
GAIN
–12dB/OCT
PHASE
(DEG)
Type 2 loops work well in systems where the ESR zero in
the LC roll-off happens close to the LC pole, limiting the
total phase shift due to the LC. The additional phase
compensation in the feedback amplifier allows the 0dB
point to be at or above the LC pole frequency, improving
0
PHASE
–6dB/OCT
0
–90
–180
loop bandwidth substantially over a simple type 1 loop. It
has limited ability to compensate for LC combinations
where low capacitor ESR keeps the phase shift near 180 °
for an extended frequency range. LTC1702 circuits using
conventional switching grade electrolytic output capaci-
tors can often get acceptable phase margin with type 2
compensation.
1702 F08
Figure 8. Transfer Function of Buck Modulator
C2
C1
R2
C1
IN
R1
R B
+
OUT
IN
R1
R B
V REF
+
OUT
1702 F10a
V REF
1702 F09a
Figure 9a. Type 1 Amplifier Schematic Diagram
Figure 10a. Type 2 Amplifier Schematic Diagram
GAIN
(dB)
PHASE
(DEG)
GAIN
(dB)
PHASE
(DEG)
–6dB/OCT
GAIN
GAIN
0
0
0
0
–6dB/OCT
PHASE
–6dB/OCT
–90
–180
–270
PHASE
–90
–180
–270
1702 F10b
1702 F09b
Figure 9b. Type 1 Amplifier Transfer Function
Figure 10b. Type 2 Amplifier Transfer Function
1702fa
21
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