参数资料
型号: MAX34441ETL+
厂商: Maxim Integrated Products
文件页数: 25/53页
文件大小: 0K
描述: IC PS MANAGER PMBUS 5CH 40TQFN
产品培训模块: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
标准包装: 50
应用: 基站网络线路卡,服务器
电源电压: 2.7 V ~ 5.5 V
电流 - 电源: 2.5mA
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 40-WFQFN 裸露焊盘
供应商设备封装: 40-TQFN-EP(6x6)
包装: 托盘
其它名称: 90-34441+T00
PMBus 5-Channel Power-Supply Manager
and Intelligent Fan Controller
Fan Spin-Up
Figure 3 shows the fan spin-up process. When the fan is
spinning up, the number of revolutions is checked every
200ms for up to 2s. When the number of cumulated revo-
lutions is greater than or equal to the spin-up relaxation
criteria, the fan passes spin-up. If the fan has a locked
rotor output, fan spin-up passes when the locked rotor
signal is no longer asserted.
When spin-up passes, the device forces the fan PWM
with a 40% duty cycle. The 40% duty cycle is maintained
until the next temperature conversion is completed,
which occurs once a second. After the temperature con-
version, the device enters either manual mode operation
or automatic operation using MFR_FAN_LUT.
100%
90%
AUTOMATIC
SPIN-UP
ENABLED
SPIN-UP
CRITERIA MET
80%
70%
RAMP PWM TO TARGET PWM OR RPM
60%
50%
40%
AUTOMATIC
(CONSTRAINED BY THE RAMP BITS)
30%
20%
SPIN-UP
DISABLED
ALWAYS RETURN TO 40% DUTY
CYCLE AFTER AUTOMATIC SPIN-UP
BEFORE BEGINNING PWM RAMP
(EVEN IF BEYOND 1 SECOND)
INITIAL TARGET PWM OR
RPM DETERMINED AFTER
TEMPERATURE CONVERSION
10%
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
TIME (SECONDS)
Figure 3. Fan Spin-Up
25
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MAX34440ETL+ IC PS MANAGER PMBUS 6CH 40TQFN
相关代理商/技术参数
参数描述
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