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参数资料
| 型号： | NCP1015ST100T3G |
| 厂商： | ON Semiconductor |
| 文件页数： | 7/22页 |
| 文件大小： | 0K |
| 描述： | IC OFFLINE SWIT SMPS CM SOT223 |
| 标准包装： | 1 |
| 输出隔离： | 隔离 |
| 频率范围： | 90kHz ~ 110kHz |
| 输入电压： | 8.1 V ~ 10 V |
| 输出电压： | 700V |
| 功率（瓦特）： | 19W |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | TO-261-4，TO-261AA |
| 供应商设备封装： | SOT-223 |
| 包装： | 标准包装 |
| 其它名称： | NCP1015ST100T3GOSDKR |
NCP1015
APPLICATION INFORMATION
Introduction
The NCP1015 offers a complete current ? mode control
solution (actually an enhanced NCP1200 controller section)
together with a high ? voltage power MOSFET in a
monolithic structure. The component integrates everything
needed to build a rugged and low ? cost Switch ? Mode Power
Supply (SMPS) featuring low standby power. The quick
selection table details the differences in operating
frequency.
? No need for an auxiliary winding: ON Semiconductor
Very High Voltage Integrated Circuit technology lets
you supply the IC directly from the high ? voltage dc
rail. We call it Dynamic Self ? Supply (DSS). This
solution simplifies the transformer design and ensures a
better control of the SMPS in difficult output
averaged version to help you closing the loop.
Ready ? to ? use templates can be downloaded in
OrCAD’s PSpice, and INTUSOFT’s IsSpice4 from ON
Semiconductor web site, NCP1015 related section.
Dynamic Self ? Supply
When the power supply is first powered from the mains
outlet, the internal current source (typically 8 mA) is biased
and charges up the V CC capacitor from the drain pin. Once
the voltage on this V CC capacitor reaches the V CC(off) level
(typically 8.5 V), the current source turns off and pulses are
delivered by the output stage: the circuit is awake and
activates the power MOSFET. Figure 12 details the internal
circuitry:
conditions, e.g. constant current operations. However,
for improved standby performance, an auxiliary
winding can be connected to the V CC pin to disable the
DSS operation.
? Short ? circuit protection: by permanently monitoring
the feedback line activity, the IC is able to detect the
presence short ? circuit, immediately reducing the output
power for a total system protection. Once the short has
disappeared, the controller resumes and goes back to
Vref OFF = 8.5 V
Vref ON = 7.5 V
Vref Latch = 4.7 V
+
-
Internal Supply
Drain
Startup Source
V CC
normal operation.
? Low standby ? power: If SMPS naturally exhibit a good
efficiency at nominal load, they begin to be less
efficient when the output power demand diminishes. By
skipping un ? needed switching cycles, the NCP1015
+
Vref
V CC(off)
+200 mV
(8.7 V Typ.)
+
CV CC
drastically reduces the power wasted during light load
conditions. An auxiliary winding can further help
decreasing the standby power to extremely low levels
by invalidating the DSS operation. Typical
measurements show results below 80 mW @ 230 Vac
for a typical 7 W universal power supply.
? No acoustic noise while operating: Instead of skipping
cycles at high peak currents, the NCP1015 waits until
the peak current demand falls below a fixed 0.25 of the
maximum limit. As a result, cycle skipping can take
place without having a singing transformer. You can
thus select cheap magnetic components free of noise
problems.
? SPICE model: a dedicated model to run transient
cycle ? by ? cycle simulations is available but also an
Figure 12. The Current Source Regulates V CC
by Introducing a Ripple
Being loaded by the circuit consumption, the voltage on
the V CC capacitor goes down. When the DSS controller
detects that V CC has reached 7.5 V (V CC(on) ), it activates the
internal current source to bring V CC toward 8.5 V and stops
again: a cycle takes place whose low frequency depends on
the V CC capacitor and the IC consumption. A 1 V ripple
takes place on the V CC pin whose average value equals
(V CC(off) + V CC(on) ) / 2. Figure 13 shows a typical operation
of the DSS.
http://onsemi.com
7
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