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参数资料
| 型号： | MAX15109EWP+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 15/19页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 8A 20WLP |
| 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： | 可编程 |
| 输入电压： | 2.7 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1MHz |
| 电流 - 输出： | 8A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | * |
| 封装/外壳： | * |
| 包装： | * |
| 供应商设备封装： | * |
High-Efficiency, 8A, Current-Mode Synchronous
Step-Down Switching Regulator with VID Control
The order of pole-zero occurrence is:
f P1 < f P2 < f Z1 < f Z2 ≤ f P3
Select R C using the transfer-loop’s fourth asymptote
gain (assuming f CO > f P1 , f P2 , and f Z1 and setting the
overall loop gain to unity) as follows:
Under heavy load, f P2 , approaches f Z1 . A graphical
representation of the asymptotic system closed-loop
1
=
V FB
V OUT
× g MV × R C × G MOD × R LOAD ×
response, including dominant pole and zero locations is
shown in Figure 3.
If C OUT is large, or exhibits a lossy equivalent series
resistance (large ESR), the circuit’s second zero
therefore:
1
2 π × f CO × C OUT × ( ESR + R LOAD )
might come into play around the crossover frequency
(f CO = ω /2 G ). In this case, a third pole can be induced
by a second (optional) small compensation capaci-
R C
=
V OUT
V FB
×
2 π × f CO × C OUT × ( ESR + R LOAD )
g MV × G MOD × R LOAD
tor (C CC ), connected from COMP to PGND. The loop
response’s fourth asymptote (in bold, Figure 4) is the
one of interest in establishing the desired crossover fre-
For R LOAD much greater than ESR, the equation can be
further simplified as follows:
V OUT 2 π × f CO × C OUT
quency (and determining the compensation component
values). A lower crossover frequency provides for stable
closed-loop operation at the expense of a slower load
R C
=
×
V FB g MV × G MOD
and line transient response. Increasing the crossover
frequency improves the transient response at the (poten-
tial) cost of system instability. A standard rule of thumb
sets the crossover frequency P 1/10th of the switching
frequency. First, select the passive and active power
components that meet the application’s requirements.
where V FB is equal to 0.6V.
Determine C C by selecting the desired first system zero,
f Z1 , based on the desired phase margin. Typically, set-
ting f Z1 below 1/5th of f CO provides sufficient phase
margin.
≤ CO
Then, choose the small-signal compensation compo-
nents to achieve the desired closed-loop frequency
response and phase margin as outlined in the Closing
the Loop: Designing the Compensation Circuitry section .
f Z1
=
Therefore:
2 π × C C R C 5
1 f
Closing the Loop:
Designing the Compensation Circuitry
Select the desired crossover frequency. Choose f CO
approximately 1/10th of the switching frequency f SW , or
f CO ≈ 100kHz.
C C ≥
5
2 π × f CO × R C
I L
I SKIP-LIMIT
I LOAD
t ON
t OFF1
t OFF2 = n x t CK
V OUT
V OUT-RIPPLE
Figure 3. Skip-Mode Waveforms
______________________________________________________________________________________
15
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