参数资料
型号: LT1578CS8-2.5#TRPBF
厂商: Linear Technology
文件页数: 20/28页
文件大小: 0K
描述: IC REG BUCK 2.5V 1.5A 8SOIC
标准包装: 2,500
类型: 降压(降压)
输出类型: 固定
输出数: 1
输出电压: 2.5V
输入电压: 4 V ~ 15 V
PWM 型: 电流模式
频率 - 开关: 200kHz
电流 - 输出: 1.5A
同步整流器:
工作温度: 0°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 8-SOIC(0.154",3.90mm 宽)
包装: 带卷 (TR)
供应商设备封装: 8-SOIC
LT1578/LT1578-2.5
APPLICATIO N S I N FOR M ATIO N
the output. Gain is set by the 1.5A/V transconductance of
the LT1578 power section and the effective complex
impedance from output to ground. Gain rolls off smoothly
above the 160Hz pole frequency set by the 100 μ F output
capacitor. Phase drop is limited to about 85 ° . Phase
recovers and gain levels off at the zero frequency ( ≈ 16kHz)
set by capacitor ESR (0.1 ? ).
Error amplifier transconductance phase and gain are shown
in Figure 11. The error amplifier can be modeled as a
transconductance of 1000 μ Mho, with an output imped-
ance of 570k ? in parallel with 2.4pF. In all practical
applications, the compensation network from the V C pin to
ground has a much lower impedance than the output
impedance of the amplifier at frequencies above 200Hz.
This means that the error amplifier characteristics them-
selves do not contribute excess phase shift to the loop, and
the phase/gain characteristics of the error amplifier sec-
tion are completely controlled by the external compensa-
tion network.
In Figure 12, full loop phase/gain characteristics are
shown with a compensation capacitor of 100pF, giving the
error amplifier a pole at 2.8kHz, with phase rolling off to
90 ° and staying there. The overall loop has a gain of 66dB
at low frequency, rolling off to unity-gain at 58kHz. The
phase plot shows a two-pole characteristic until the ESR
of the output capacitor brings it back to single pole above
16kHz. Phase margin is about 77 ° at unity-gain.
LT1578
2000
200
CURRENT MODE
POWER STAGE
g m = 1.5A/V
ERROR
AMPLIFIER
V SW
R1
OUTPUT
1500
PHASE
150
FB
1000
GAIN
100
GND
V C
1.21V
+
ESR
C1
500
V FB ( 1 × 10 –3 )
R OUT
570k
V C
C OUT
2.4pF
50
0
ERROR AMPLIFIER EQUIVALENT CIRCUIT
0
C F
R C
C C
R2
–500
10
R LOAD = 50 ?
100
1k 10k
100k
–50
1M
FREQUENCY (Hz)
1578 F11
1578 F09
Figure 9. Model for Loop Response
Figure 11. Error Amplifier Gain and Phase
40
40
80
180
V IN = 10V
V OUT = 5V
20
I OUT = 500mA
0
60
135
GAIN
40
PHASE
90
PHASE
0
–40
20
V IN = 10V
V OUT = 5V
45
–20
–80
0
I OUT = 500mA
C OUT = 100 μ F
10V, AVX TPS
GAIN
0
C C = 100pF
L = 30 μ H
–40
10
100
1k
10k
–120
100k
–20
10
100
1k 10k
100k
–45
1M
FREQUENCY (Hz)
1578 F07
FREQUENCY (Hz)
1578 F12
20
Figure 10. Response from V C Pin to Output
Figure 12. Overall Loop Characteristics
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