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参数资料
| 型号： | MAX1858A-MAX1876A |
| 厂商： | Maxim Integrated Products, Inc. |
| 英文描述： | Dual 180∑ Out-of-Phase Buck Controllers with Sequencing/Prebias Startup and POR |
| 中文描述： | 双180Σ外的多相降压控制器与排序/偏置启动和葡萄牙 |
| 文件页数： | 14/22页 |
| 文件大小： | 553K |
| 代理商： | MAX1858A-MAX1876A |
M
Dual 180° Out-of-Phase Buck Controllers with
Sequencing/Prebias Startup and POR
14
______________________________________________________________________________________
SYNC Driven by External Oscillator:
The controller
generates the clock signal by dividing down the
SYNC input signal, so that the switching frequency
equals half the synchronization frequency (f
SW
=
f
SYNC
/2). REG1
’
s conversion cycles initiate on the ris-
ing edge of the internal clock signal. The CKO output
frequency and phase match REG1
’
s switching fre-
quency (f
CKO
= f
DH1
) and the CKO signal is in
phase. Note that the MAX1858A/MAX1875A/
MAX1876A still require R
OSC
when SYNC is external-
ly clocked and the internal oscillator frequency should
be set to 50% of the synchronization frequency (f
SW
= 0.5 f
SYNC
).
Thermal Overload Protection
Thermal overload protection limits total power dissipation
in the MAX1858A/MAX1875A/MAX1876A. When the
device
’
s die-junction temperature exceeds T
J
= +160
°
C,
an on-chip thermal sensor shuts down the device, forcing
DL_ and DH_ low, allowing the IC to cool. The thermal
sensor turns the part on again after the junction tempera-
ture cools by 10
°
C. During thermal shutdown, the regula-
tors shut down,
RST
goes low, and soft-start is reset. If
the V
L
linear-regulator output is short circuited, thermal-
overload protection is triggered.
Design Procedure
Effective Input Voltage Range
Although the MAX1858A/MAX1875A/MAX1876A con-
trollers can operate from input supplies ranging from
4.5V to 23V, the input voltage range can be effectively
limited by the MAX1858A/MAX1875A/MAX1876As
’
duty-cycle limitations. The maximum input voltage is
limited by the minimum on-time (t
ON(MIN)
):
where t
ON(MIN)
is 100ns. The minimum input voltage is
limited by the switching frequency and minimum off-
time, which determine the maximum duty cycle
(D
MAX
= 1 - f
SW
t
OFF(MIN)
):
where V
DROP1
is the sum of the parasitic voltage drops
in the inductor discharge path, including synchronous
rectifier, inductor, and PC board resistances. V
DROP2
is
the sum of the resistances in the charging path, includ-
ing high-side switch, inductor, and PC board resis-
tances.
V
V
1-
V
f
V
V
IN MIN
(
OUT
SW OFF MIN
DROP
(
DROP
DROP
)
)
=
+
+
1
2
1
-
V
V
t
IN MAX
(
OUT
ON MIN SW
(
)
)
≤
SYNC
SLAVE
OSC
SYNC
CK0
MASTER
V
L
4-OUTPUT APPLICATION
3-OUTPUT APPLICATION
DH1
DH2
DH
MASTER
SLAVE
180
°
PHASE SHIFT
90
°
PHASE SHIFT
DH1
DH2
DH1
DH2
MASTER
SLAVE
MAX1858A
MAX1875A
MAX1876A
MAX1858A
MAX1875A
MAX1876A
MAX1858A
MAX1875A
MAX1876A
SYNC
SLAVE
OSC
OSC
SYNC
CK0
MASTER
V
L
Figure 7. Synchronized Controllers
相关PDF资料 |
PDF描述 |
|---|---|
| MAX1858A | Dual 180?Out-of-Phase Buck Controllers with Sequencing/Prebias Startup and POR |
| MAX1875A | Dual 180?Out-of-Phase Buck Controllers with Sequencing/Prebias Startup and POR |
| MAX1876A | Dual 180?Out-of-Phase Buck Controllers with Sequencing/Prebias Startup and POR |
| MAX1858AEEG | Dual 180∑ Out-of-Phase Buck Controllers with Sequencing/Prebias Startup and POR |
| MAX186CMJP | Low-Power, 8-Channel, Serial 12-Bit ADCs |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1858EEG | 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 |
| MAX1858EEG+ | 功能描述:电压模式 PWM 控制器 Dual 180 Out Buck Controllers 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 |
| MAX1858EEG+T | 功能描述:电压模式 PWM 控制器 Dual 180 Out Buck Controllers 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 |
| MAX1858EEG-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 |
| MAX1858EVKIT | 功能描述:DC/DC 开关控制器 Evaluation Kit for the MAX1858 MAX1875 MAX1876 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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