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UC3965 Datasheet

  • UC3965

  • Precision Reference with Low Offset Error Amplifier

  • 4頁(yè)

  • TI

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application
INFO
available
UC1965
UC2965
UC3965
Precision Reference with Low Offset Error Amplifier
FEATURES
鈥?/div>
Accessible 2.5V Precision Reference
鈥?/div>
0.4% Initial Reference Accuracy
鈥?/div>
1% Reference Accuracy over Line,
Load, and Full Temperature Range
鈥?/div>
Low 1mV Offset Error Amplifier
鈥?/div>
Supports Closed Loop Soft Start
鈥?/div>
2X Inverting Amplifier / Buffer Output
鈥?/div>
4.1V Undervoltage Lockout
鈥?/div>
ICC 2mA at 5V
鈥?/div>
8-Pin SOIC or DIL Package
DESCRIPTION
The UC3965 is suitable for applications needing greater precision and
more functionality than the TL431 type shunt regulators. The wide range
VCC input capability enables the device to be biased from the secondary
side output voltage rail, resulting in closed loop soft start.
The UC3965 includes an accessible 2.5V precision reference which offers
0.4% initial and 1% reference accuracy over line, load, and full tempera-
ture range with a low offset error amplifier, a 2X inverting amplifier/buffer,
and an undervoltage lockout circuit. The IC is ideally suited for applica-
tions where high precision PWM power supply regulation is required.
Typically, the error amplifier is configured to compare a fraction of the to
be regulated power supply voltage to the on-chip 2.5V reference. The 2X
amplifier/buffer output is then used to drive a PWM controller or regulator.
The UC3965 is also capable of driving an optocoupler diode for isolated
applications.
BLOCK DIAGRAM
OFFSET
1
8
COMP
VCC
2
UVLO
5k
+
OB
鈥?/div>
VCC
7.5k
VREF
2.5V
7
VFB
VOUT
3
15k
鈥?/div>
EA
+
5k
6
VREF
GND
4
2k
5
NI
UDG-98055
SLUS300A - APRIL 1999

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