参数资料
| 型号： | CS5157HGD16 |
| 厂商： | ON Semiconductor |
| 文件页数： | 10/16页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR BUCK SYNC 5BIT 16-SOIC |
| 产品变化通告： | Product Obsolescence 11/Feb/2009 Product Obsolescence 30/Dec/2003 |
| 标准包装： | 48 |
| 应用： | 控制器，Intel Pentium? II |
| 输入电压： | 4.25 V ~ 20 V |
| 输出数： | 2 |
| 输出电压： | 1.3 V ~ 2.05 V，2.1 V ~ 3.5 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-SOIC |
| 包装： | 管件 |
CS5157H
Short Circuit Protection
A lossless hiccup mode short circuit protection feature is
provided, requiring only the Soft?Start capacitor to
implement. If a short circuit condition occurs (V FFB < 1.0 V),
the V FFB low comparator sets the FAULT latch. This causes
the MOSFET to shut off, disconnecting the regulator from it’s
input voltage. The Soft?Start capacitor is then slowly
discharged by a 2.0 m A current source until it reaches it’s
lower 0.7 V threshold. The regulator will then attempt to
restart normally, operating in it’s extended off time mode with
a 50% duty cycle, while the Soft?Start capacitor is charged
with a 60 m A charge current.
If the short circuit condition persists, the regulator output
will not achieve the 1.0 V low V FFB comparator threshold
before the Soft?Start capacitor is charged to it’s upper 2.5 V
threshold. If this happens the cycle will repeat itself until the
short is removed. The Soft?Start charge/discharge current
ratio sets the duty cycle for the pulses (2.0 m A/60 m A = 3.3%),
while actual duty cycle is half that due to the extended off time
mode (1.65%).
This protection feature results in less stress to the
regulator components, input power supply, and PC board
traces than occurs with constant current limit protection (see
Figures 12 and 13).
If the short circuit condition is removed, output voltage
will rise above the 1.0 V level, preventing the FAULT latch
from being set, allowing normal operation to resume.
M 50.0 m s
Trace 4? 5.0 V from PC Power Supply (2.0 V/div.)
Trace 2? Inductor Switching Node (2.0 V/div.)
Figure 13. Startup with Regulator Output Shorted
Overvoltage Protection
Overvoltage protection (OVP) is provided as result of the
normal operation of the V 2 control topology and requires no
additional external components. The control loop responds
to an overvoltage condition within 100 ns, causing the top
MOSFET to shut off, disconnecting the regulator from it’s
input voltage. The bottom MOSFET is then activated,
resulting in a “crowbar” action to clamp the output voltage
and prevent damage to the load (see Figures 14 and 15 ). The
regulator will remain in this state until the overvoltage
condition ceases or the input voltage is pulled low. The
bottom FET and board trace must be properly designed to
implement the OVP function.
M 25.0 ms
Trace 4? 5.0 V Supply Voltage (2.0 V/div.)
Trace 3? Soft?Start Timing Capacitor (1.0 V/div.)
Trace 2? Inductor Switching Node (2.0 V/div.)
Figure 12. CS5157H Demonstration Board Hiccup
Mode Short Circuit Protection. Gate Pulses are
Delivered While the Soft?Start Capacitor Charges, and
Cease During Discharge
M 10.0 m s
Trace 4? 5.0 V from PC Power Supply (5.0 V/div.)
Trace 1? Regulator Output Voltage (1.0 V/div.)
Trace 2? Inductor Switching Node (5.0 V/div.)
Figure 14. OVP Response to an Input?to?Output
Short Circuit by Immediately Providing 0% Duty
Cycle, Crow?Barring the Input Voltage to Ground
http://onsemi.com
10
相关PDF资料 |
PDF描述 |
|---|---|
| ESA24DTAT | CONN EDGECARD 48POS R/A .125 SLD |
| X5168V14T1 | IC SUPERVISOR CPU 16K EE 14TSSOP |
| EMA24DTAT | CONN EDGECARD 48POS R/A .125 SLD |
| GBB60DHFR-S578 | CONN EDGECARD 120POS .050 SMD |
| RSC18DRTS-S93 | CONN EDGECARD 36POS DIP .100 SLD |
相关代理商/技术参数 |
参数描述 |
|---|---|
| CS5157HGD16G | 功能描述:DC/DC 开关控制器 5-Bit Synchronous Dual N-Channel Buck RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| CS5157HGDR16 | 功能描述:DC/DC 开关控制器 5-Bit Synchronous RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| CS5157HGDR16G | 功能描述:DC/DC 开关控制器 5-Bit Synchronous Dual N-Channel Buck RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| CS-5158D16 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Voltage-Mode SMPS Controller |
| CS-5158DR16 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Voltage-Mode SMPS Controller |
发布紧急采购，3分钟左右您将得到回复。