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| 型号： | MAX17030EVKIT+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 20/39页 |
| 文件大小： | 0K |
| 描述： | EVALUATION KIT FOR MAX17030 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 系列： | Quick-PWM™ |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 0 ~ 1.5 V |
| 输入电压： | 7 ~ 26 V |
| 稳压器拓扑结构： | 降压 |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | MAX17030 |
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1/2/3-Phase Quick-PWM
IMVP-6.5 VID Controllers
T ( V + 0 . 075 V )
Detailed Description
Free-Running, Constant-On-Time PWM
Controller with Input Feed-Forward
The Quick-PWM control architecture is a pseudo-fixed-
frequency, constant-on-time, current-mode regulator with
voltage feed-forward (Figure 3). This architecture relies on
the output filter capacitor’s ESR to act as the current-
sense resistor, so the output ripple voltage provides the
PWM ramp signal. The control algorithm is simple: the
high-side switch on-time is determined solely by a one-
shot whose period is inversely proportional to input volt-
age, and directly proportional to output voltage or the
difference between the main and secondary inductor cur-
rents (see the On-Time One-Shot section). Another one-
shot sets a minimum off-time. The on-time one-shot
triggers when the error comparator goes low, the inductor
current of the selected phase is below the valley current-
limit threshold, and the minimum off-time one-shot times
out. The controller maintains 120° out-of-phase operation
by alternately triggering the three phases after the error
comparator drops below the output-voltage set point.
Triple 120° Out-of-Phase Operation
The three phases in the MAX17030/MAX17036 operate
120 ° out-of-phase to minimize input and output filtering
requirements, reduce electromagnetic interference (EMI),
and improve efficiency. This effectively lowers component
count—reducing cost, board space, and component
power requirements—making the MAX17030/MAX17036
ideal for high-power, cost-sensitive applications.
The MAX17030/MAX17036 share the current between
three phases that operate 120 ° out-of-phase, so the
high-side MOSFETs never turn on simultaneously dur-
ing normal operation. The instantaneous input current
of each phase is effectively reduced, resulting in
reduced input voltage ripple, ESR power loss, and RMS
ripple current (see the Input Capacitor Selection sec-
tion). Therefore, the same performance can be
achieved with fewer or less-expensive input capacitors.
+5V Bias Supply (V CC and V DD )
The Quick-PWM controller requires an external +5V
bias supply in addition to the battery. Typically, this
+5V bias supply is the notebook’s 95% efficient +5V
system supply. The +5V bias supply must provide V CC
(PWM controller) and V DD (gate-drive power), so the
V IN and V DD can be connected together if the input
power source is a fixed +4.5V to +5.5V supply. If the
+5V bias supply is powered up prior to the battery sup-
ply, the enable signal ( SHDN going from low to high)
must be delayed until the battery voltage is present to
ensure startup.
Switching Frequency (TON)
Connect a resistor (R TON ) between TON and V IN to set
the switching period T SW = 1/f SW , per phase:
T SW = 16.26pF x (R TON + 6.5k Ω )
A 96.75k Ω to 303.25k Ω corresponds to switching peri-
ods of 167ns (600kHz) to 500ns (200kHz), respectively.
High-frequency (600kHz) operation optimizes the appli-
cation for the smallest component size, trading off effi-
ciency due to higher switching losses. Low-frequency
(200kHz) operation offers the best overall efficiency at
the expense of component size and board space.
TON Open-Circuit Protection
The TON input includes open-circuit protection to avoid
long, uncontrolled on-times that could result in an over-
voltage condition on the output. The MAX17030/
MAX17036 detect an open-circuit fault if the TON current
drops below 10μA for any reason—the TON resistor
(R TON ) is unpopulated, a high resistance value is used,
the input voltage is low, etc. Under these conditions, the
MAX17030/MAX17036 stop switching (DH and DL pulled
low) and immediately set the fault latch. Toggle SHDN or
cycle the V CC power supply below 0.5V to clear the fault
latch and reactivate the controller.
On-Time One-Shot
The MAX17030/MAX17036 contain a fast, low-jitter,
adjustable one-shot that sets the high-side MOSFETs
on-time. It is shared among the three phases. The one-
shot for the main phase varies the on-time in response
to the input and feedback voltages. The main high-side
switch on-time is inversely proportional to the input volt-
age as measured by the V+ input, and proportional to
the feedback voltage (V FB ):
t ON = SW FB
V IN
The one-shot for the second phase and third phase
varies the on-time in response to the input voltage and
maximum current drawn is:
I BIAS = I CC + f SW ( Q G ( LOW ) + Q G ( HIGH )
)
the difference between the main and the other inductor
currents. Two identical transconductance amplifiers
integrate the difference between the master and each
where I CC is provided in the Electrical Characteristics
table, f SW is the switching frequency, and Q G(LOW) and
Q G(HIGH) are the MOSFET data sheet ’s total gate-
charge specification limits at V GS = 5V.
slave’s current-sense signals. The summed output is
connected to an internal integrator for each master-
slave pair, which serves as the input to the respective
slave’s high-side MOSFET TON timer.
20
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX17030EVKIT+ | 功能描述:电源管理IC开发工具 MAX17030 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 |
| MAX17030GTL+ | 功能描述:电压模式 PWM 控制器 1/2/3-Phase PWM IMVP-6.5 VID Ctlr RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| MAX17030GTL+T | 功能描述:电压模式 PWM 控制器 1/2/3-Phase PWM IMVP-6.5 VID Ctlr RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| MAX17031ETG+ | 功能描述:电压模式 PWM 控制器 Dual PWM Step-Down Controller RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| MAX17031ETG+T | 功能描述:电压模式 PWM 控制器 Dual PWM Step-Down Controller RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
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