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| 型号： | ZL2004EVK1 |
| 厂商： | Intersil |
| 文件页数： | 15/42页 |
| 文件大小： | 0K |
| 描述： | KIT EVAL FOR ZL2004 |
| 标准包装： | 1 |
| 系列： | * |
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ZL2004
5.3 Start-up Procedure
The ZL2004 follows a specific internal start-up
procedure after power is applied to the VDD pin. Table
10 describes the start-up sequence.
If the device is to be synchronized to an external clock
source, the clock frequency must be stable prior to
asserting the EN pin. The device requires
approximately 5-10 ms to check for specific values
stored in its internal memory. If the user has stored
values in memory, those values will be loaded. The
device will then check the status of all multi-mode pins
and load the values associated with the pin settings.
Once this process is completed, the device is ready to
accept commands via the I 2 C/SMBus interface and the
device is ready to be enabled. Once enabled, the device
requires approximately 2 ms before its output voltage
may be allowed to start its ramp-up process. If a soft-
start delay period less than 2 ms has been configured
(using PMBus commands), the device will default to a
2 ms delay period (with an accuracy of approx ±0.25
ms). If a delay period greater than 2 ms is configured,
the device will wait for the configured delay period
prior to starting to ramp its output.
After the delay period has expired, the output will
begin to ramp towards its target voltage according to
the pre-configured soft-start ramp time that has been
set using the SS pin.
Table 10. ZL2004 Start-up Sequence
5.4 Soft Start Delay and Ramp Times
Soft Start Delay and Ramp Times
In some applications, it may be necessary to set a delay
from when an enable signal is received until the output
voltage starts to ramp to its target value. In addition,
the designer may wish to precisely set the time
required for V OUT to ramp to its target value after the
delay period has expired. These features may be used
as part of an overall inrush current management
strategy or to precisely control how fast a load IC is
turned on. The ZL2004 gives the system designer
several options for precisely and independently
controlling both the delay and ramp time periods.
The soft-start delay period begins when the EN pin is
asserted and ends when the delay time expires. The
soft-start delay period is set using the SS pin.
The soft-start ramp timer enables a precisely controlled
ramp to the nominal V OUT value that begins once the
delay period has expired. The ramp-up is guaranteed
monotonic and its slope may be precisely set using the
SS pin.
The soft start delay and ramp times can be set to
Step #
1
2
3
4
Step Name
Power Applied
Internal Memory
Check
Multi-mode Pin
Check
Device Ready
Description
Input voltage is applied to the ZL2004’s VDD pin
The device will check for values stored in its internal
memory. This step is also performed after a Restore
command.
The device loads values configured by the multi-
mode pins.
The device is ready to accept an enable signal.
Time Duration
Depends on input supply
ramp time
Approx 5-10 ms (device
will ignore an enable signal
or PMBus traffic during this
period)
The device requires approximately 2 ms following an
5
Pre-ramp Delay
enable signal and prior to ramping its output.
Additional pre-ramp delay may be configured using
Approximately 2 ms
the Delay pins.
15
FN6846.3
February 15, 2011
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ZL2005 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Digital-DC? Integrated Power Management and Conversion IC |
| ZL2005ALNF | 制造商:Intersil Corporation 功能描述:DIGITAL DC-DC CONTROLLER W/ DRIVERS - TRAY100 - Trays 制造商:Intersil Corporation 功能描述:IC REG CNTRLR BUCK PWM 36-QFN 制造商:Intersil Corporation 功能描述:Digital DC-DC Controller w/ Drivers - BULK 50 |
| ZL2005ALNFT | 功能描述:电压模式 PWM 控制器 DIGTL DC-DC CNTRLR W/DRVRS TR100 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 |
| ZL2005ALNFT1 | 功能描述:电压模式 PWM 控制器 DIGTL DC-DC CNTRLR W/DRVRS TR1K 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 |
| ZL2005P | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Digital-DC? Controller with Drivers and POLA/DOSA Trim |
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