NCP1203. 1203P60 Datasheet

1203P60 Datasheet PDF


Part

1203P60

Description

NCP1203

Manufacture

ON Semiconductor

Page 14 Pages
Datasheet
Download 1203P60 Datasheet


1203P60 Datasheet
NCP1203
PWM Current−Mode
Controller for Universal
Off−Line Supplies Featuring
Standby and Short Circuit
Protection
Housed in SOIC−8 or PDIP−8 package, the NCP1203 represents a
major leap toward ultra−compact Switchmode Power Supplies and
represents an excellent candidate to replace the UC384X devices. Due
to its proprietary SMARTMOSt Very High Voltage Technology, the
circuit allows the implementation of complete off−line AC−DC
adapters, battery charger and a high−power SMPS with few external
components.
With an internal structure operating at a fixed 40 kHz, 60 kHz or
100 kHz switching frequency, the controller features a high−voltage
startup FET which ensures a clean and loss−less startup sequence. Its
current−mode control naturally provides good audio−susceptibility
and inherent pulse−by−pulse control.
When the current setpoint falls below a given value, e.g. the output
power demand diminishes, the IC automatically enters the so−called
skip cycle mode and provides improved efficiency at light loads
while offering excellent performance in standby conditions. Because
this occurs at a user adjustable low peak current, no acoustic noise
takes place.
The NCP1203 also includes an efficient protective circuitry which,
in presence of an output over load condition, disables the output
pulses while the device enters a safe burst mode, trying to restart.
Once the default has gone, the device auto−recovers. Finally, a
temperature shutdown with hysteresis helps building safe and robust
power supplies.
Features
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High−Voltage Startup Current Source
Auto−Recovery Internal Output Short−Circuit Protection
Extremely Low No−Load Standby Power
Current−Mode with Adjustable Skip−Cycle Capability
Internal Leading Edge Blanking
250 mA Peak Current Capability
Internally Fixed Frequency at 40 kHz, 60 kHz and 100 kHz
Direct Optocoupler Connection
Undervoltage Lockout at 7.8 V Typical
SPICE Models Available for TRANsient and AC Analysis
Pin to Pin Compatible with NCP1200
Applications
AC−DC Adapters for Notebooks, etc.
Offline Battery Chargers
Auxiliary Power Supplies (USB, Appliances, TVs, etc.)
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8
1
SOIC−8
D1, D2 SUFFIX
CASE 751
MARKING
DIAGRAMS
8
xxxxxx
ALYW
G
1
8
1
8
PDIP−8
N SUFFIX
CASE 626
xxxxxxxxx
AWL
YYWW
1
xx = Specific Device Code
A = Assembly Location
WL, L = Wafer Lot
Y, YY = Year
W, WW = Work Week
PIN CONNECTIONS
Adj 1
FB 2
CS 3
GND 4
8 HV
7 NC
6 VCC
5 Drv
(Top View)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 12 of this data sheet.
© Semiconductor Components Industries, LLC, 2004
October, 2004− Rev. 4
1
Publication Order Number:
NCP1203/D

1203P60 Datasheet
NCP1203
EMI
FILTER
UNIVERSAL
INPUT
*
+ Aux.
NCP1203
Adj HV
18
2 FB
7
3 CS VCC 6
GND Drv
45
+
*Please refer to the application information section
Figure 1. Typical Application Example
VOUT
+
PIN FUNCTION DESCRIPTION
Pin No. Pin Name
1 Adj
Function
Adjust the skipping peak current
2 FB Sets the peak current setpoint
3 CS
4 GND
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5 Drv
6 VCC
7 NC
8 HV
Current sense input
The IC ground
Driving pulses
Supplies the IC
Ensure a clean and lossless
startup sequence
Pin Description
This pin lets you adjust the level at which the cycle skipping process takes
place. Shorting this pin to ground, permanently disables the skip cycle
feature.
By connecting an optocoupler to this pin, the peak current setpoint is
adjusted accordingly to the output power demand. Skip cycle occurs when
FB falls below Vpin1.
This pin senses the primary current and routes it to the internal comparator
via an L.E.B.
The driver’s output to an external MOSFET.
This pin is connected to an external bulk capacitor of typically 22 mF.
This unconnected pin ensures adequate creepage distance.
Connected to the high−voltage rail, this pin injects a constant current into
the VCC capacitor during the startup sequence.
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2


Features Datasheet pdf NCP1203 PWM Current−Mode Controller fo r Universal Off−Line Supplies Featuri ng Standby and Short Circuit Protection Housed in SOIC−8 or PDIP−8 package , the NCP1203 represents a major leap t oward ultra−compact Switchmode Power Supplies and represents an excellent ca ndidate to replace the UC384X devices. Due to its proprietary SMARTMOSt Very H igh Voltage Technology, the circuit all ows the implementation of complete off line AC−DC adapters, battery charge r and a high−power SMPS with few exte rnal components. With an internal struc ture operating at a fixed 40 kHz, 60 kH z or 100 kHz switching frequency, the c ontroller features a high−voltage sta rtup FET which ensures a clean and loss −less startup sequence. Its current mode control naturally provides good a udio−susceptibility and inherent puls e−by−pulse control. When the curren t setpoint falls below a given value, e .g. the output power demand diminishes, the IC automatically enters the so−called skip cycle mode and provides improved efficiency.
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