NCP1203
PWM Current鈭扢ode
Controller for Universal
Off鈭扡ine Supplies Featuring
Standby and Short Circuit
Protection
Housed in SO-8 or DIP8 package, the NCP1203 represents a major
leap toward ultra- compact Switch- Mode Power Supplies and
represents an excellent candidate to replace the UC384X devices.
Thanks 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
start-up FET which ensures a clean and loss-less start-up sequence.
Its current-mode control naturally provides good audio-susceptibility
and inherent pulse-by-pulse control.
When the current set point 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
http://onsemi.com
MARKING
DIAGRAMS
8
8
1
SO-8
D1, D2 SUFFIX
CASE 751
1
8
PDIP-8
N SUFFIX
CASE 626
1
1
XXXXXXXXX
AWL
YYWW
XXXXXX
ALYW
8
xx
A
WL, L
YY, Y
WW, W
= Specific Device Code
= Assembly Location
= Wafer Lot
= Year
= Work Week
PIN CONNECTIONS
Adj 1
FB 2
CS 3
Gnd 4
(Top View)
8 HV
7 NC
6 V
CC
5 Drv
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High-Voltage Start-Up 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
ORDERING INFORMATION
Device
NCP1203P60
NCP1203D60R2
NCP1203P40
NCP1203D40R2
NCP1203P100
NCP1203D100R2
Package
PDIP8
SO-8
PDIP8
SO-8
PDIP8
SO-8
Shipping
50 Units/Tube
2500/Tape & Reel
50 Units/Tube
2500/Tape & Reel
50 Units/Tube
2500/Tape & Reel
Applications
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AC/DC Adapters for Notebooks, etc.
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Offline Battery Chargers
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Auxiliary Power Supplies (USB, Appliances, TVs, etc.)
漏
Semiconductor Components Industries, LLC, 2003
1
February, 2003- Rev. 3
Publication Order Number:
NCP1203/D
NCP1203/D相關(guān)型號(hào)PDF文件下載
-
型號(hào)
版本
描述
廠商
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