参数资料
| 型号： | NCP1308DR2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 7/16页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR FLYBACK PWM 8-SOIC |
| 标准包装： | 1 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 75kHz |
| 电源电压： | 11 V ~ 20 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： | 无 |
| 工作温度： | 0°C ~ 125°C |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 剪切带 (CT) |
| 其它名称： | NCP1308DR2GOSCT |
NCP1308
APPLICATION INFORMATION
INTRODUCTION
a noise-free operation with cheap transformer. This
The NCP1308 implements a standard current mode
architecture where the switch-off time is dictated by the
peak current setpoint, whereas the core reset detection
?
option also offers the ability to fix the maximum
switching frequency when entering light load conditions.
Overcurrent Protection (OCP): By continuously
triggers the turn-on event. This component represents the
ideal candidate where low part-count is the key parameter,
particularly in low-cost AC/DC adapters, consumer
electronics, auxiliary supplies, etc. Due to its
high-performance High-Voltage technology, the
NCP1308 incorporates all the necessary
components/features needed to build a rugged and reliable
Switch-Mode Power Supply (SMPS):
? Transformer Core Reset Detection: Borderline/critical
operation is ensured whatever the operating conditions
are. As a result, there are virtually no primary switch
turn-on losses and no secondary diode recovery
losses. The converter also stays a first-order system
and accordingly eases the feedback loop design.
? Quasi-Resonant Operation: By delaying the turn-on
event, it is possible to restart the MOSFET in the
minimum of the drain-source wave, ensuring reduced
EMI/video noise perturbations. In nominal power
conditions, the NCP1308 operates in Borderline
Conduction Mode (BCM) also called Critical
Conduction Mode (CCM).
? Dynamic Self-Supply (DSS): Due to its Very High
Voltage Integrated Circuit (VHVIC) technology, ON
Semiconductor 's NCP1308 allows for a direct pin
connection to the high-voltage DC rail. A dynamic
current source charges up a capacitor and thus
provides a fully independent V CC level to the
NCP1308. As a result, there is no need for an auxiliary
monitoring the FB line activity, NCP1308 enters burst
mode as soon as the power supply undergoes an
overload. The device enters a safe low power
operation that prevents from any lethal thermal
runaway. As soon as the default disappears, the power
supply resumes operation. Unlike other controllers,
overload detection is performed independently of any
auxiliary winding level. In presence of a bad coupling
between both power and auxiliary windings, the short
circuit detection can be severely affected. The DSS
naturally shields you against these troubles.
Dynamic Self-Supply
The DSS principle is based on the charge/discharge of the
V CC bulk capacitor from a low level up to a higher level.
We can easily describe the current source operation with
some simple logical equations:
POWER-ON: IF V CC < VCC OFF THEN Current Source
is ON, no output pulses
IF V CC decreasing > VCC ON THEN
Current Source is OFF, output is pulsing
IF V CC increasing < VCC OFF THEN
Current Source is ON, output is pulsing
Typical values are: VCC OFF = 12 V, VCC ON = 10 V
To better understand the operational principle, the
diagram in Figure 12 offers the necessary light:
winding to supply the IC, whose management is
always a problem in variable output voltage designs
(e.g. battery chargers).
? Overvoltage Protection (OVP): B y monitoring the
V CC pin via a 50 m s time constant filter, the NCP1308
goes into latched fault condition whenever an
overvoltage condition is detected. This occurs if V CC
goes above 16 V typically. The controller stays fully
latched in this position until the V CC is cycled down to
4 V, e.g. when the user unplugs the power supply from
the mains outlet and re-plugs it.
? Adjustable Skip Cycle Level: By offering the ability
to tailor the level at which the skip cycle takes place,
Vripple = 2V
VCC OFF= 12V
VCC ON= 10V
ON
OFF
Output pulses
the designer can make sure that the skip operation
only occurs at low peak current. This point guarantees
Figure 12. The Charge/Discharge Cycle over a 10 m F
V CC Capacitor
http://onsemi.com
7
相关PDF资料 |
PDF描述 |
|---|---|
| NCP1337DR2G | IC REG CTRLR FLYBK ISO PWM 7SOIC |
| NCP1338DR2G | IC REG CTRLR FLYBK ISO PWM 7SOIC |
| NCP1377BP | IC CTRLR PWM CM OVP UVLO 8DIP |
| NCP1378PG | IC REG CTRLR FLYBACK PWM 7-PDIP |
| NCP1379DR2G | IC CTLR QUASI CURRENT MODE 8SOIC |
相关代理商/技术参数 |
参数描述 |
|---|---|
| NCP1316 | 制造商:未知厂家 制造商全称:未知厂家 功能描述: |
| NCP1336 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Quasi-Resonant Current Mode Controller for High Power Universal Off-Line Supplies |
| NCP1336A | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Quasi-Resonant Current Mode Controller for High Power Universal Off-Line Supplies |
| NCP1336ADR2G | 功能描述:电流型 PWM 控制器 QUASI-RES CUR MODE CONTRL 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 |
| NCP1336B | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Quasi-Resonant Current Mode Controller for High Power Universal Off-Line Supplies |
发布紧急采购，3分钟左右您将得到回复。