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| 型号： | NCP1587ADR2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 6/16页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 8-SOIC |
| 标准包装： | 2,500 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 220kHz |
| 占空比： | 80% |
| 电源电压： | 4.5 V ~ 13.2 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： | 0°C ~ 70°C |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
NCP1587, NCP1587A
DETAILED OPERATING DESCRIPTION
General
The NCP1587 and NCP1587A are PWM controllers
intended for DC ? DC conversion from 5.0 V & 12 V buses.
The devices have a 1 A internal gate driver circuit designed
to drive N ? channel MOSFETs in a synchronous ? rectifier
buck topology. The output voltage of the converter can be
precisely regulated down to 800 mV ± 1.0% when the V FB
pin is tied to V OUT . The switching frequency, is internally set
to 275 kHz (NCP1587) and 200 kHz (NCP1587A). A high
gain operational transconductance error amplifier (OTA) is
used.
Duty Cycle and Maximum Pulse Width Limits
In steady state DC operation, the duty cycle will stabilize
at an operating point defined by the ratio of the input to the
output voltage. The devices can achieve an 80% duty cycle.
There is a built in off ? time which ensures that the bootstrap
supply is charged every cycle. Both parts can allow a 12 V
to 0.8 V conversion at 275 kHz (NCP1587) and 200 kHz
(NCP1587A).
Input Voltage Range (V CC and BST)
The input voltage range for both V CC and BST is 4.5 V to
13.2 V with respect to GND and PHASE, respectively.
Although BST is rated at 13.2 V with respect to PHASE, it
can also tolerate 26.4 V with respect to GND.
External Enable/Disable
When the Comp pin voltage falls or is pulled externally
below the 400 mV threshold, it disables the PWM Logic and
the gate drive outputs. In this disabled mode, the operational
transconductance amplifier (EOTA) output source current is
reduced and limited to the Soft ? Start mode of 10 m A.
Normal Shutdown Behavior
Normal shutdown occurs when the IC stops switching
because the input supply reaches UVLO threshold. In this
case, switching stops, the internal SS is discharged, and all
GATE pins go low. The switch node enters a high impedance
state and the output capacitors discharge through the load
with no ringing on the output voltage.
External Soft ? Start
The NCP1587/A features an external soft ? start function,
which reduces inrush current and overshoot of the output
voltage. Soft ? start is achieved by using the internal current
source of 10 m A (typ), which charges the external integrator
capacitor of the transconductance amplifier. Figure 8 is a
typical soft ? start sequence. This sequence begins once V CC
surpasses its UVLO threshold and OCP programming is
complete. During soft ? start, as the Comp Pin rises through
400 mV, the PWM Logic and gate drives are enabled. When
the feedback voltage crosses 800 mV, the EOTA will be
given control to switch to its higher regulation mode output
current of 120 m A.
4.2 V
V CC
0.9 V
Comp
V fb
BG
TG
V out
550 mV
50 mV
OCP
Program
ming
0.8 V
POR
UVLO
SS
NORMAL
Figure 8. Soft ? Start Implementation
http://onsemi.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| NCP1587DR2G | 功能描述:电压模式 PWM 控制器 BUCK CONTROLLER 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 |
| NCP1587EDR2G | 功能描述:电流型 PWM 控制器 BUCK CONTROLLER RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| NCP1587GDR2G | 制造商:ON Semiconductor 功能描述:BUCK CONVERTER - Tape and Reel 制造商:ON Semiconductor 功能描述:REEL / BUCK CONVERTER |
| NCP1588MTR2G | 功能描述:IC REG CTRLR BUCK PWM VM 10-DFN 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) |
| NCP1589AMNTWG | 功能描述:电压模式 PWM 控制器 BUCK REGULATOR 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 |
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