NCP1015ST100T3G ON Semiconductor, NCP1015ST100T3G Datasheet - Page 7

• Manufacturer Part Number: NCP1015ST100T3G
• Description: IC OFFLINE SWIT SMPS CM SOT223
• Manufacturer: ON Semiconductor

Specifications of NCP1015ST100T3G

• Output Isolation: Isolated
• Frequency Range: 90 ~ 110kHz
• Voltage - Input: 8.5 ~ 10 V
• Voltage - Output: 700V
• Power (watts): 19W
• Operating Temperature: 0°C ~ 150°C
• Package / Case: TO-261-4, TO-261AA, SOT-223-4
• Duty Cycle (max): 72 %
• Mounting Style: SMD/SMT
• Switching Frequency: 1000 KHz
• Operating Supply Voltage: - 0.3 V to + 10 V
• Maximum Operating Temperature: + 150 C
• Minimum Operating Temperature: - 60 C
• Operating Temperature (max): 150C
• Pin Count: 3 +Tab
• Mounting: Surface Mount
• Package Type: SOT-223
• Case Length: 6.5mm
• Case Height: 1.57mm
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Introduction
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.
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•
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The NCP1015 offers a complete current−mode control
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
conditions, e.g. constant current operations. However,
for improved standby performance, an auxiliary
winding can be connected to the V
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
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
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
CC
pin to disable the
APPLICATION INFORMATION
http://onsemi.com
7
Dynamic Self−Supply
outlet, the internal current source (typically 8 mA) is biased
and charges up the V
the voltage on this V
(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:
the V
detects that V
internal current source to bring V
again: a cycle takes place whose low frequency depends on
the V
takes place on the V
(V
of the DSS.
When the power supply is first powered from the mains
Being loaded by the circuit consumption, the voltage on
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.
CC(off)
Figure 12. The Current Source Regulates V
CC
CC
Vref OFF = 8.5 V
Vref ON = 7.5 V
Vref
+
Vref
capacitor and the IC consumption. A 1 V ripple
capacitor goes down. When the DSS controller
+ V
Latch
CC(on)
CC
Internal Supply
= 4.7 V
+
-
has reached 7.5 V (V
by Introducing a Ripple
) / 2. Figure 13 shows a typical operation
(8.7 V Typ.)
CC
CC
+200 mV
CC
V
CC(off)
capacitor reaches the V
capacitor from the drain pin. Once
pin whose average value equals
CC
toward 8.5 V and stops
CC(on)
Startup Source
V
), it activates the
CC
Drain
CC(off)
+
CV
CC
CC
level