- 您现在的位置：买卖IC网 > PDF目录13774 > NCP1522BSNT1G (ON Semiconductor)IC REG BUCK SYNC ADJ 0.6A 5TSOP PDF资料下载
参数资料
| 型号： | NCP1522BSNT1G |
| 厂商： | ON Semiconductor |
| 文件页数： | 9/14页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 0.6A 5TSOP |
| 标准包装： | 1 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.9 V ~ 3.3 V |
| 输入电压： | 2.7 V ~ 5.5 V |
| PWM 型： | 电压模式 |
| 频率 - 开关： | 3MHz |
| 电流 - 输出： | 600mA |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 6-TSOP（0.059"，1.50mm 宽）5 引线 |
| 包装： | 标准包装 |
| 供应商设备封装： | 5-TSOP |
| 其它名称： | NCP1522BSNT1GOSDKR |
NCP1522B
DC/DC OPERATION DESCRIPTION
Detailed Description
The NCP1522B uses a constant frequency, voltage mode
step ? down architecture. Both the main (P ? Channel
MOSFET) and synchronous (N ? Channel MOSFET)
switches are internal.
The output voltage is set by an external resistor divider
in the range of 0.9 V to 3.3 V and can source at least
600 mA.
The NCP1522B works with two modes of operation;
PWM/PFM depending on the current required. In PWM
mode, the device can supply voltage with a tolerance of
" 3% and 90% efficiency or better. Lighter load currents
cause the device to automatically switch into PFM mode to
reduce current consumption and extended battery life.
Additional features include soft ? start, undervoltage
protection, current overload protection, and thermal
shutdown protection. As shown in Figure 1, only six
external components are required. The part uses an internal
reference voltage of 0.6 V. It is recommended to keep
NCP1522B in shutdown mode until the input voltage is
2.7 V or higher.
PWM Operating Mode
In this mode, the output voltage of the device is regulated
by modulating the on ? time pulse width of the main switch
Q1 at a fixed 3 MHz frequency.
The switching of the PMOS Q1 is controlled by a
flip ? flop driven by the internal oscillator and a comparator
that compares the error signal from an error amplifier with
the sum of the sensed current signal and compensation
ramp.
The driver switches ON and OFF the upper side transistor
(Q1) and switches the lower side transistor in either ON
state or in current source mode.
At the beginning of each cycle, the main switch Q1 is
turned ON by the rising edge of the internal oscillator
clock. The inductor current ramps up until the sum of the
current sense signal and compensation ramp becomes
higher than the error amplifier ’s voltage. Once this has
occurred, the PWM comparator resets the flip ? flop, Q1 is
turned OFF while the synchronous switch Q2 is turned in
its current source mode. Q2 replaces the external Schottky
diode to reduce the conduction loss and improve the
efficiency. To avoid overall power loss, a certain amount of
dead time is introduced to ensure Q1 is completely turned
V OUT 10 mV/div
I Lx 100 mA/div
V Lx 2 V/div
200 ns/div
Figure 27. PWM Switching Waveform
(V IN = 3.6 V, V OUT = 1.2 V, I OUT = 600 mA)
PFM Operating Mode
Under light load conditions, the NCP1522B enters in low
current PFM mode operation to reduce power
consumption. The output regulation is implemented by
pulse frequency modulation. If the output voltage drops
below the threshold of PFM comparator, a new cycle will
be initiated by the PFM comparator to turn on the switch
Q1. Q1 remains ON during the minimum on time of the
structure while Q2 is in its current source mode. The peak
inductor current depends upon the drop between input and
output voltage. After a short dead time delay where Q1 is
switched OFF, Q2 is turned in its ON state. The negative
current detector will detect when the inductor current drops
below zero and sends the signal to turn Q2 to current source
mode to prevent a too large deregulation of the output
voltage. When the output voltage falls below the threshold
of the PFM comparator, a new cycle starts immediately.
V out
V Lx
OFF before Q2 is being turned ON.
Figure 28. PFM Switching Waveforms
(V IN = 3.6 V, V OUT = 1.2 V, I OUT = 0 mA, Temp = 25 _ C)
http://onsemi.com
9
相关PDF资料 |
PDF描述 |
|---|---|
| RSM12DTMS | CONN EDGECARD 24POS R/A .156 SLD |
| RCM28DTMH | CONN EDGECARD 56POS R/A .156 SLD |
| RBM25DTMH | CONN EDGECARD 50POS R/A .156 SLD |
| RBM25DTMD | CONN EDGECARD 50POS R/A .156 SLD |
| RCM28DTMD | CONN EDGECARD 56POS R/A .156 SLD |
相关代理商/技术参数 |
参数描述 |
|---|---|
| NCP1522BUEVB | 功能描述:电源管理IC开发工具 NCP1522 EVALUATION BOARD RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| NCP1522BUGEVB | 功能描述:电源管理IC开发工具 RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| NCP1523BFCT2G | 功能描述:直流/直流开关转换器 FORCED PWM NCP1523 RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| NCP1523BGEVB | 功能描述:电源管理IC开发工具 NCP1523B EVAL BRD RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| NCP1523FCT2G | 功能描述:直流/直流开关转换器 UBUMP DCDC RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
发布紧急采购，3分钟左右您将得到回复。