参数资料
型号: LM3495MTCX/NOPB
厂商: National Semiconductor
文件页数: 25/36页
文件大小: 0K
描述: IC REG BUCK SYNC ADJ 10A 16TSSOP
标准包装: 1
系列: PowerWise®
类型: 降压(降压)
输出类型: 可调式
输出数: 1
输出电压: 0.6 V ~ 5.5 V
输入电压: 2.9 V ~ 18 V
PWM 型: 电流模式,混合
频率 - 开关: 200kHz ~ 1.5MHz
电流 - 输出: 10A
同步整流器:
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 16-TSSOP(0.173",4.40mm 宽)
包装: 标准包装
供应商设备封装: 16-TSSOP
产品目录页面: 1300 (CN2011-ZH PDF)
配用: LM3495EVAL-ND - BOARD EVALUATION LM3495
其它名称: LM3495MTCXDKR
SNVS410F – FEBRUARY 2006 – REVISED APRIL 2013
The value, B, can be determined by evaluating the power stage transfer function at the desired cross-over
frequency, or by reading the value graphically from the power stage gain plot. Setting B equal to the inverse of
the linear gain will force the total loop gain to be 1 (0dB) at the cross-over frequency. For this example the
desired cross-over frequency is 1/10 of the switching frequency, or 50 kHz. At 50 kHz the value of G PS is
approximately -4dB, or 0.63V/V. This indicates a system where the f Z ≥ f SW . The value B should then be set to
1.58V/V and increased by 0.1V/V steps until the phase margin is at 45°. For this example, phase is 45° when B
is 2.8V/V.
Once R 1 has been selected, C 1 is calculated based on the value of R 1 as shown in the following equation:
C 1 =
1
2 S x R 1 x f P
(32)
R 1 = 3.73 k ? , and C1 = 15.7 nF. The closest 1% value should be used for R 1 and the closest 10% value used for
C 1 , which gives:
R 1 = 3.74 k ? 1%
C 1 = 15 nF 10%
The error amplifier of the LM3495 has a unity-gain bandwidth of 10 MHz. In order to model the effect of this
limitation, the open-loop gain, OPG, can be calculated as:
OPG =
2 S x 10 MHz
2 S x 10 MHz
s+
g m x 72 M :
(33)
The new error amplifier transfer function taking into account unity-gain bandwidth is:
G EA-ACTUAL =
G EA x OPG
1 + G EA + OPG
(34)
The gain and phase of the error amplifier are shown in Figure 38 .
50
40
30
20
10
0
-10
0
-30
-60
-90
-120
-150
-180
100
1k
10k
100k
1M
100
1k
10k
100k
1M
FREQUENCY (Hz)
FREQUENCY (Hz)
Figure 38. Error Amplifier Gain and Phase
The total control loop transfer function, H, is equal to the power stage transfer function multiplied by the error
amplifier transfer function. The bandwidth and phase margin can be read graphically from Bode plots of H,
shown in Figure 39.
H = G PS x G EA-ACTUAL
(35)
Copyright ? 2006–2013, Texas Instruments Incorporated
Product Folder Links: LM3495
25
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