參數(shù)資料
型號(hào)： MAX1876A
廠商： 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： 雙路、180°異相工作的buck控制器，具有排序/預(yù)偏置啟動(dòng)和POR
文件頁(yè)數(shù)： 14/22頁(yè)
文件大?。?/td> 553K
代理商： 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
相關(guān)PDF資料
PDF描述
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX1876AEEG 功能描述:DC/DC 開(kāi)關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
MAX1876AEEG+ 功能描述:電壓模式 PWM 控制器 Dual 180 Out PWM Step-Down RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開(kāi)關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel
MAX1876AEEG+T 功能描述:電壓模式 PWM 控制器 Dual 180 Out PWM Step-Down RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開(kāi)關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel
MAX1876AEEG-T 功能描述:DC/DC 開(kāi)關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
MAX1876EEG 功能描述:DC/DC 開(kāi)關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
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