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| 型号： | ZL2004ALNFT1 |
| 厂商： | Intersil |
| 文件页数： | 28/42页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK SYNC ADJ 32QFN |
| 标准包装： | 1,000 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | * |
| 占空比： | 95% |
| 电源电压： | 4.5 V ~ 14 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | * |
| 包装： | * |
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ZL2004
6. Power Management Functional Description
6.1 Input Undervoltage Lockout
The input undervoltage lockout (UVLO) prevents the
ZL2004 from operating when the input falls below a
preset threshold, indicating the input supply is out of
its specified range. The UVLO threshold (V UVLO ) can
be set between 4.5V and 10.8 V using the SS pin. The
simplest implementation is to connect the SS pin as
The UVLO voltage can also be set to any value
between 2.85 V and 16 V via the I 2 C/SMBus interface.
Once an input undervoltage fault condition occurs, the
device can respond in a number of ways as follows:
1. Continue operating without interruption.
2. Continue operating for a given delay period,
followed by shutdown if the fault still exists. The
device will remain in shutdown until instructed to
restart.
3. Initiate an immediate shutdown until the fault has
been cleared. The user can select a specific number
of retry attempts.
The default response from a UVLO fault is an
immediate shutdown of the device. The device will
continuously check for the presence of the fault
condition. If the fault condition is no longer present,
the ZL2004 will be re-enabled.
Please refer to Application Note AN33 for details on
how to configure the UVLO threshold or to select
specific UVLO fault response options via the
I 2 C/SMBus interface.
6.2 Output Overvoltage Protection
The ZL2004 offers an internal output overvoltage
protection circuit that can be used to protect sensitive
load circuitry from being subjected to a voltage higher
than its prescribed limits. A hardware comparator is
used to compare the actual output voltage (seen at the
VSEN pin) to a threshold set to 15% higher than the
target output voltage (the default setting). If the VSEN
voltage exceeds this threshold, the PG pin will de-
assert and the device can then respond in a number of
ways as follows:
1. Initiate an immediate shutdown until the fault has
been cleared. The user can select a specific number
of retry attempts.
28
2. Turn off the high-side MOSFET and turn on the
low-side MOSFET. The low-side MOSFET
remains ON until the device attempts a restart.
The default response from an overvoltage fault is to
immediately shut down. The device will continuously
check for the presence of the fault condition, and when
the fault condition no longer exists the device will be
re-enabled.
For continuous overvoltage protection when operating
from an external clock, the only allowed response is an
immediate shutdown.
Refer to AN33 for details on how to select specific
overvoltage fault response options.
6.3 Output Pre-Bias Protection
An output pre-bias condition exists when an externally
applied voltage is present on a power supply’s output
before the power supply’s control IC is enabled.
Certain applications require that the converter not be
allowed to sink current during start up if a pre-bias
condition exists at the output. The ZL2004 provides
pre-bias protection by sampling the output voltage
prior to initiating an output ramp.
If a pre-bias voltage lower than the target voltage exists
after the pre-configured delay period has expired, the
target voltage is set to match the existing pre-bias
voltage and both drivers are enabled. The output
voltage is then ramped to the final regulation value at
the ramp rate set by the SS pin.
FN6846.3
February 15, 2011
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ZL2004ALNFT1-01 | 功能描述:IC REG CTRLR BUCK SYNC ADJ 32QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:75 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:1MHz 占空比:81% 电源电压:4.3 V ~ 13.5 V 降压:是 升压:是 回扫:是 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:0°C ~ 70°C 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:管件 产品目录页面:1051 (CN2011-ZH PDF) 其它名称:296-2543-5 |
| ZL2004ALNN | 功能描述:IC REG CTRLR BUCK SYNC ADJ 32QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:100% 电源电压:8.2 V ~ 30 V 降压:无 升压:无 回扫:是 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:是 工作温度:0°C ~ 70°C 封装/外壳:8-DIP（0.300"，7.62mm） 包装:管件 产品目录页面:1316 (CN2011-ZH PDF) |
| ZL2004ALNN-01 | 功能描述:IC REG CTRLR BUCK SYNC ADJ 32QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:100% 电源电压:8.2 V ~ 30 V 降压:无 升压:无 回扫:是 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:是 工作温度:0°C ~ 70°C 封装/外壳:8-DIP（0.300"，7.62mm） 包装:管件 产品目录页面:1316 (CN2011-ZH PDF) |
| ZL2004ALNNT | 功能描述:IC REG CTRLR BUCK SYNC ADJ 32QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:100% 电源电压:8.2 V ~ 30 V 降压:无 升压:无 回扫:是 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:是 工作温度:0°C ~ 70°C 封装/外壳:8-DIP（0.300"，7.62mm） 包装:管件 产品目录页面:1316 (CN2011-ZH PDF) |
| ZL2004ALNNT-01 | 功能描述:IC REG CTRLR BUCK SYNC ADJ 32QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:100% 电源电压:8.2 V ~ 30 V 降压:无 升压:无 回扫:是 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:是 工作温度:0°C ~ 70°C 封装/外壳:8-DIP（0.300"，7.62mm） 包装:管件 产品目录页面:1316 (CN2011-ZH PDF) |
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