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参数资料
| 型号： | MAX1980 |
| 厂商： | Maxim Integrated Products, Inc. |
| 元件分类： | DC/DC变换器 |
| 英文描述： | Quick-PWM Slave Controller with Driver Disable for Multiphase DC-DC Converter |
| 中文描述： | Quick-PWM从控制器，带有驱动禁止功能，用于多相DC-DC转换器 |
| 文件页数： | 11/33页 |
| 文件大小： | 1153K |
| 代理商： | MAX1980 |
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M
Quick-PWM Slave Controller with
Driver Disable for Multiphase DC-DC Converter
______________________________________________________________________________________
11
Detailed Description
The MAX1980 step-down slave controller is intended for
low-voltage, high-current, multiphase DC-DC applica-
tions. The MAX1980 slave controller can be combined
with any of Maxim
’
s Quick-PWM step-down controllers to
form a multiphase DC-DC converter. When compared to
single-phase operation, multiphase conversion lowers the
peak inductor current by distributing the load current
between parallel power paths. This simplifies component
selection, power distribution to the load, and thermal lay-
out. Existing Quick-PWM controllers, such as the
MAX1718, function as the master controller, providing
accurate output-voltage regulation, fast transient
response, and multiple fault-protection features.
Synchronized to the master
’
s low-side gate driver, the
MAX1980 includes a constant on-time controller, syn-
chronous rectifier gate drive, active current balancing,
and precision current-limit circuitry.
On-Time Control and Active
Current Balancing
The MAX1980 slave controller uses a constant on-time,
voltage feed-forward architecture similar to Maxim
’
s
Quick-PWM controllers (Figure 2). The control algorithm
is simple: the high-side switch on-time is determined
solely by a one-shot whose period is inversely propor-
tional to input voltage and directly proportional to the
compensation voltage (V
COMP
). Another one-shot sets a
minimum off-time (130ns typical). The on-time one-shot
is triggered when the following conditions are satisfied:
The slave detects a transition on the TRIG input, the
slave controller
’
s inductor current is below its current-
limit threshold, and the minimum off time has expired.
Pin Description (continued)
PIN
NAME
DESCRIPTION
17
V+
Battery Voltage Sense Connection. Connect V+ to the input power source. V+ is used only for PWM one-
shot timing (see the
On-Time Control and Active Current Balancing
section).
18
LIMIT
Open-Drain Current-Limit Output. Connect to the master controller
’
s adjustable current-limit input (ILIM)
according to the
Standard Application Circuit
(Figure 1). When the voltage across the master controller
’
s
current-sense resistor (V
CM+
- V
CM-
) exceeds the current-limit threshold (V
ILIM
/10), the MAX1980 pulls
LIMIT low.
19
ILIM
Dual-Mode Current-Limit Adjustment and Standby Input. The current-limit threshold voltage is 1/10 the
voltage seen at ILIM (V
ILIM
) over a 400mV to 1.5V range. If V
ILIM
drops below 250mV, the slave
controller enters a low-power standby mode, forcing DL low and DH low.
20
TRIG
Trigger Input. Connect to the master controller
’
s low-side gate driver. The trigger input
’
s polarity is pin
selectable: POL = V
CC
or floating triggers on the rising edge (out-of-phase operation), and POL = GND
triggers on the falling edge (in-phase operation).
Table 1. Component Selection for Standard
Applications
COMPONENT
Output Voltage
Input Voltage Range
Maximum Load Current
CIRCUIT OF FIGURE 1
0.6V to 1.75V
7V to 24V
40A
Inductor (each phase)
0.6μH
Sumida CDEP134H-0R6 or
Panasonic ETQP6F0R6BFA
Frequency
300kHz (TON = float)
High-Side MOSFET
(N
H
, each phase)
International Rectifier
(2) IRF7811W
Low-Side MOSFET
(N
L
, each phase)
International Rectifier
(2) IRF7822 or
Fairchild (3) FDS7764A or
Input Capacitor (C
IN
)
(6) 10μF, 25V
Taiyo Yuden
TMK432BJ106KM or
TDK C4532X5R1E106M
Output Capacitor (C
OUT
)
(8) 270μF, 2.0V
Panasonic EEFUE0E271R
Current-Sense Resistors
(R
CS
and R
CM
)
1.5m
Voltage Positioning Gain
(A
VPS
)
1
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1980EGP | 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 |
| MAX1980EGP-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 |
| MAX1980ETP | 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 |
| MAX1980ETP+ | 功能描述:DC/DC 开关控制器 PWM Slave Controller w/Driver Disable 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 |
| MAX1980ETP+T | 功能描述:DC/DC 开关控制器 PWM Slave Controller w/Driver Disable 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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