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UC1965J Scheda tecnica(PDF) 4 Page - Texas Instruments

Il numero della parte UC1965J
Spiegazioni elettronici  Precision Reference with Low Offset Error Amplifier
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UC1965
UC2965
UC3965
UNITRODE CORPORATION
7 CONTINENTAL BLVD. • MERRIMACK, NH 03054
TEL. (603) 424-2410 • FAX (603) 424-3460
For designs requiring input-output isolation, the UC3965
is used in secondary side output voltage sensing. As
shown in Fig. 1, the precision reference and low offset
error amplifier can be used in converters, such as the
isolated flyback, where the primary side error amplifier is
not used or simply not present. In this case, the
UCC3809 is used as the primary side controller.
The precision reference of the UC3965 is tied to the
non-inverting input of the device’s internal error amplifier.
The output voltage of the converter is resistively divided
and compared to this reference at the inverting input.
This error amplifier has a low 1mV input offset voltage
that insures accurate regulation of the output. The inter-
nal error amplifier drives the inverting input of the output
buffer (OB) which drives an optocoupler diode. The wide
range VCC voltage enables the device to be biased from
the secondary side output voltage rail, resulting in closed
loop soft start.
As the output voltage increases beyond its desired value,
the voltage difference at the error amplifier increases.
This results in less drive at the inverting input of the inter-
nal buffer, increasing its output drive to the optocoupler.
If the application does not require input-output isolation,
this buffer could be used to drive the PWM directly.
APPLICATION INFORMATION
For
additional
application
information
biasing
the
UC3965, please refer to the following publication:
[1] Application Note U-165,
Design Review: Isolated 50W
Flyback with the UCC3809 Primary Side Controller and
the UC3965 Precision Reference and Error Amplifier,by
Lisa Dinwoodie.
ADDITIONAL INFORMATION
8
7
6
5
1
2
3
4
EA
OB
UVLO
VREF
2.5V
VCC
15k
+
7.5k
5k
+
5k
2k
–V
OUT
+V
OUT
8
7
5
6
1
2
4
3
UCC3809
+V
IN
–V
IN
FB
REF
SS
RT1
RT2
VDD
OUT
GND
OFFSET
VCC
VOUT
GND
COMP
VFB
VREF
NI
Figure 1. Typical application diagram.
UDG-99080


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