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| 型号： | MAX5060ATI+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 26/31页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 28-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 60 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1.5MHz |
| 占空比： | 90% |
| 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 ~ 125°C |
| 封装/外壳： | 28-WFQFN 裸露焊盘 |
| 包装： | 管件 |
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0.6V to 5.5V Output, Parallelable,
Average-Current-Mode DC-DC Controllers
Keep the maximum output voltage deviation less than
or equal to the adaptive voltage-positioning window
( ? V OUT ). Assume 50% contribution each from the out-
put capacitance discharge and the ESR drop. Use the
following equations to calculate the required ESR and
capacitance value:
100% of the average current-limit value. The average
current-limit architecture accurately limits the average
output current to its current-limit threshold. If the hiccup
current limit is programmed to be equal or above the
average current-limit value, the output current will not
reach the point where the hiccup current limit can trig-
ESR OUT =
? V ESR
I STEP
ger. Program the hiccup current limit at least 5% below
the average current limit to ensure that the hiccup cur-
rent-limit circuit triggers during overload. See the
C OUT = STEP RESPONSE
I × t
? V Q
where I STEP is the load step and t RESPONSE is the
response time of the controller. Controller response
time depends on the control-loop bandwidth.
Current Limit
Hiccup Current Limit vs. R EXT graph in the Typical
Operating Characteristics .
Reverse Current Limit (MAX5060)
The MAX5060 limits the reverse current in case V BUS is
higher than the preset output voltage. Calculate the
maximum reverse current based on V CLR , the reverse-
current-limit threshold and the current-sense resistor.
In addition to the average current limit, the
MAX5060/MAX5061 also have hiccup current limit. The
hiccup current limit is set to 10% below the average
I REVERSE =
V CLR
R S
current limit to ensure that the circuit goes in hiccup
mode during continuous output short circuit.
Connecting a resistor from LIM to ground increases the
hiccup current limit, while shorting LIM to ground dis-
ables the hiccup current-limit circuit.
Average Current Limit
The average-current-mode control technique of the
MAX5060/MAX5061 accurately limits the maximum out-
put current. The MAX5060/MAX5061 sense the voltage
across the sense resistor and limit the peak inductor
current (I L-PK ) accordingly. The ON cycle terminates
when the current-sense voltage reaches 25.5mV (min).
Use the following equation to calculate the maximum
current-sense resistor value:
where I REVERSE is the total reverse current sink into the
converter and V CLR = 2.3mV (typ).
Compensation
The main control loop consists of an inner current loop
and an outer voltage loop. The MAX5060/MAX5061 use
an average current-mode control scheme to regulate
the output voltage (Figure 5). I PHASE is the inner aver-
age current loop. The VEA output provides the control-
ling voltage for this current source. The inner current
loop absorbs the inductor pole reducing the order of
the outer voltage loop to that of a single-pole system.
A resistive feedback network around the VEA provides
the best possible response, since there are no capaci-
tors to charge and discharge during large-signal excur-
R S =
0 . 0255
I OUT
sions. R F and R IN determine the VEA gain. Use the
following equation to calculate the value of R F :
PD R =
0 . 75 × 10 ? 3
R S
R F =
I OUT × R IN
G C × ? V OUT
where PD R is the power dissipation in the sense resis-
tors. Select a 5% lower value of R S to compensate for
G C =
0 . 0289
R S
any parasitics associated with the PC board. Also,
select a non-inductive resistor with the appropriate
power rating.
Hiccup Current Limit
The hiccup current-limit value is always 10% lower than
the average current-limit threshold, when LIM is left
unconnected. Connect a resistor from LIM to SGND to
increase the hiccup current-limit value from 90% to
where G C is the current-loop transconductance and R S
is the value of the sense resistor.
When designing the current-control loop ensure that
the inductor downslope (when it becomes an upslope
at the CEA output) does not exceed the ramp slope.
This is a necessary condition to avoid sub-harmonic
oscillations similar to those in peak current-mode con-
trol with insufficient slope compensation.
26
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX5060ATI+ | 功能描述:DC/DC 开关控制器 .6-5.5V Parallelable Average-Current-Mode 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 |
| MAX5060ATI+T | 功能描述:DC/DC 开关控制器 .6-5.5V Parallelable Average-Current-Mode 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 |
| MAX5060ATI-T | 功能描述:DC/DC 开关控制器 .6-5.5V Parallelable Average-Current-Mode 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 |
| MAX5060ETI | 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 |
| MAX5060ETI+ | 功能描述:DC/DC 开关控制器 .6-5.5V Parallelable Average-Current-Mode 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 |
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