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| 型号： | MAX5066EUI+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 20/22页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 28TSSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| PWM 型： | 电流模式 |
| 输出数： | 2 |
| 频率 - 最大： | 1MHz |
| 电源电压： | 4.75 V ~ 28 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 28-SOIC（0.173"，4.40mm 宽）裸露焊盘 |
| 包装： | 管件 |
Configurable, Single-/Dual-Output, Synchronous
Buck Controller for High-Current Applications
I REVERSE =
1 . 63 × 10 ? 3
R SENSE
For stability of the current loop, the amplified inductor-
current downslope at the negative input of the PWM
comparator (CPWM1 and CPWM2) must not exceed
the ramp slope at the comparator’s positive input. This
Output-Voltage Setting
The output voltage is set by the combination of resistors
R1, R2, and R F as described in the Voltage Error Amplifier
section. First select a value for resistor R2. Then calculate
the value of R1 from the following equation:
puts an upper limit on the current-error amplifier gain at
the switching frequency. The inductor current downs-
lope is given by V OUT /L where L is the value of the
inductor (L1 and L2 in Figure 6) and V OUT is the output
voltage. The amplified inductor current downslope at
the negative input of the PWM comparator is given by:
V OUT
R 1 =
( V OUT ( NL ) ? 0 . 6135 )
0 . 6135
× R 2
? V L
? t
L
= × R SENSE × 36 × g M × R CF
R F = OUT SENSE
where V OUT(NL) is the voltage at no load. Then find the
value of R F from the following equation:
I × R × 36 × R 1
? V OUT
where ? V OUT is the allowable drop in voltage from no
where R SENSE is the current-sense resistor (R1 and R2
in Figure 6) and g M x R CF is the gain of the current-error
amplifier (CEA_) at the switching frequency. The slope
of the ramp at the positive input of the PWM comparator
is 2V x f SW . Use the following equation to calculate the
maximum value of R CF (R14 or R15 in Figure 6).
load to full load. R F is R8 and R9, R1 is R4 and R6, R2
is R5 and R7 in Figure 6.
R CF ≤
2 × f SW × L
V OUT × R SENSE × 36 × g M
( 1 )
Compensation
f CMAX = SW IN
f SW = CMAX OUT
The MAX5066 uses an average current-mode control
scheme to regulate the output voltage (see Figure 2).
The main control loop consists of an inner current loop
and an outer voltage loop. The voltage error amplifier
(VEA1 and VEA2) provides the controlling voltage for
the current loop in each phase. The output inductor is
“hidden” inside the inner current loop. This simplifies
the design of the outer voltage control loop and also
improves the power-supply dynamics. The objective of
the inner current loop is to control the average inductor
current. The gain-bandwidth characteristic of the cur-
rent loop can be tailored for optimum performance by
The highest crossover frequency f CMAX is given by:
f × V
2 π × V OUT
or alternatively:
f × 2 π × V
V IN
Equation (1) can now be rewritten as:
the compensation network at the output of the current-
error amplifier (CEA1 or CEA2). Compared with peak
current-mode control, the current-loop gain crossover
R CF =
π × f C × L
V IN × R S × 9 × g M
( 2 )
frequency, f C , can be made approximately the same,
< f C < SW .
but the gain at low frequencies is much higher. This
results in the following advantages over peak current-
mode control.
1) The average current tracks the programmed cur-
rent with a high degree of accuracy.
2) Slope compensation is not required, but there is a
limit to the loop gain at the switching frequency in
order to achieve stability.
3) Noise immunity is excellent.
4) The average current-mode method can be used to
sense and control the current in any circuit branch.
In practical applications, pick the crossover frequency
(f C ) in the range of:
f SW f
10 2
First calculate R CF in equation 2 above. Calculate C CF
such that:
10
C CF =
2 × π × f C × R CF
where C CF is C10 and C12 in Figure 6.
20
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX5066EUI+ | 功能描述:DC/DC 开关控制器 Synch Buck Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX5066EUI+T | 功能描述:DC/DC 开关控制器 Synch Buck Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX5066EUI-T | 功能描述:DC/DC 开关控制器 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX5066EVKIT | 功能描述:电源管理IC开发工具 MAX5066 Eval Kit RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| MAX5067 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Dual-Phase, +0.6V to +3.3V Output Parallelable, Average-Current-Mode Controllers |
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