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參數(shù)資料
| 型號： | MAX1875-MAX1876 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Dual 180∑ Out-of-Phase PWM Step- Down Controllers with POR |
| 中文描述： | 雙180Σ外的三相PWM降壓控制器的復(fù)位 |
| 文件頁數(shù)： | 6/21頁 |
| 文件大?。?/td> | 493K |
| 代理商： | MAX1875-MAX1876 |
M
Dual 180° Out-of-Phase PWM Step-
Down Controllers with POR
6
_______________________________________________________________________________________
Pin Description
PIN
NAME
FUNCTION
1
COMP2
Compensation Pin for Regulator 2 (REG2). Compensate REG2
’
s control loop by connecting a series
resistor (R
COMP2
) and capacitor (C
COMP2A
) to GND in parallel with a second compensation capacitor
(C
COMP2B
) as shown in Figure 1.
2
FB2
Feedback Input for Regulator 2 (REG2). Connect FB2 to a resistive-divider between REG2
’
s output
and GND to adjust the output voltage between 1V and 18V. To set the output voltage below 1V,
connect FB2 to a resistive voltage-divider from REF to REG2
’
s output. See the
Setting the Output
Voltage
section.
3
ILIM2
Current-Limit Adjustment for Regulator 2 (REG2). The PGND
–
LX2 current-limit threshold defaults to
100mV if ILIM2 is connected to V
L
. Connect a resistor (R
ILIM2
) from ILIM2 to GND to adjust the
REG2
’
s current-limit threshold (V
ITH2
) from 50mV (R
ILIM2
= 100k
) to 300mV (R
ILIM2
= 600k
). See
the
Setting the Valley Current Limit
section.
4
OSC
Oscillator Frequency Set Input. The controller generates the clock signal by dividing down the
oscillator, so the switching frequency equals half the synchronization frequency (f
SW
= f
OSC
/2).
Connect a resistor from OSC to GND (R
OSC
) to set the switching frequency from 100kHz (R
OSC
=
60k
) to 600kHz (R
OSC
= 10k
). The controller still requires R
OSC
when an external clock is
connected to SYNC. When using SYNC, set R
OSC
for one half of the SYNC input.
Input Supply Voltage. 4.75V to 23V.
2V Reference Output. Bypass to GND with a 0.22μF or greater ceramic capacitor.
Analog Ground
5
6
7
V+
REF
GND
8
CKO
Clock Output. Clock Output for external 2- or 4-phase synchronization (see
the
Clock Synchronization
(SYNC, CKO)
section).
9
SYNC
Synchronization Input or Clock Output Selection Input. SYNC has three operating modes. Connect
SYNC to a 200kHz to 1200kHz clock for external synchronization. Connect SYNC to GND for 2-phase
operation as a master controller. Connect SYNC to V
L
for 4-phase operation as a master controller
(see the
Clock Synchronization (SYNC, CKO)
section).
10
ILIM1
Current-Limit Adjustment for Regulator 1 (REG1). The PGND
–
LX1 current-limit threshold defaults to
100mV if ILIM1 is connected to V
L
. Connect a resistor (R
ILIM1
) from ILIM1 to GND to adjust REG1
’
s
current-limit threshold (V
ITH1
) from 50mV (R
ILIM1
= 100k
) to 300mV (R
ILIM1
= 600k
). See the
Setting the Valley Current Limit
section.
11
FB1
Feedback Input for Regulator 1 (REG1). Connect FB1 to a resistive-divider between REG1
’
s output
and GND to adjust the output voltage between 1V and 18V. To set the output voltage below 1V,
connect FB1 to a resistive voltage-divider from REF and REG1
’
s output. See the
Setting the Output
Voltage
section.
12
COMP1
Compensation Pin for Regulator 1 (REG1). Compensate REG1
’
s control loop by connecting a series
resistor (R
COMP1
) and capacitor (C
COMP1A
) to GND in parallel with a second compensation capacitor
(C
COMP1B
) as shown in Figure 1.
13
RST
Open-Drain Reset Output (MAX1876 only).
RST
is low when either output voltage is more than 10%
below its regulation point. After soft-start is completed and both outputs exceed 90% of their nominal
output voltage (V
FB
_ > 0.9V),
RST
becomes high impedance after a 140ms delay and remains high
impedance as long as both outputs maintain regulation. Connect a resistor between
RST
and the
logic supply for logic-level voltages.
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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 開關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(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 拓撲結(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(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 拓撲結(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(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 開關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(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 開關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(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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