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| 型号： | LT1578IS8#TR |
| 厂商： | Linear Technology |
| 文件页数： | 20/28页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 1.5A 8SOIC |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 可调至 1.21V |
| 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： | 无 |
| 工作温度： | -40°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 |
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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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