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UCC1805J883B Datasheet(PDF) 4 Page - Texas Instruments

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Part # UCC1805J883B
Description  Low-Power BiCMOS Current-Mode PWM Controllers
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

UCC1805J883B Datasheet(HTML) 4 Page - Texas Instruments

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1
COMP
8
REF
2
FB
7
VCC
3
CS
6
OUT
4
RC
5
GND
1
COMP
8
REF
2
FB
7
VCC
3
CS
6
OUT
4
RC
5
GND
4
UCC1800, UCC1801, UCC1802, UCC1803, UCC1804, UCC1805
UCC2800, UCC2801, UCC2802, UCC2803, UCC2804, UCC2805
UCC3800, UCC3801, UCC3802, UCC3803, UCC3804, UCC3805
SLUS270E – MARCH 1999 – REVISED JUNE 2016
www.ti.com
Product Folder Links: UCC1800 UCC1801 UCC1802 UCC1803 UCC1804 UCC1805 UCC2800 UCC2801 UCC2802
UCC2803 UCC2804 UCC2805 UCC3800 UCC3801 UCC3802 UCC3803 UCC3804 UCC3805
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Copyright © 1999–2016, Texas Instruments Incorporated
7 Pin Configuration and Functions
UCC280x and UCC380x PW Package
8-Pin TSSOP
Top View
UCCx80x D, J, or N Package
8-Pin SOIC, CDIP, or PDIP
Top View
UCC1800 L Package
20-Pin LCC
Top View
Pin Functions
PIN
I/O
DESCRIPTION
NAME
TSSOP,
SOIC, DIL
LCC
COMP
1
2
O
COMP is the output of the error amplifier and the input of the PWM comparator.
The error amplifier in the UCCx80x family is a true, low output impedance, 2-MHz
operational amplifier. As such, the COMP terminal can both source and sink
current. However, the error amplifier is internally current-limited, so the user can
command zero duty cycle by externally forcing COMP to GND.
The UCCx80x family features built-in full-cycle soft start. Soft start is implemented
as a clamp on the maximum COMP voltage.
CS
3
7
I
CS is the input to the current sense comparators. The UCCx80x family has two
different current sense comparators: the PWM comparator and an overcurrent
comparator.
The UCCx80x family contains digital current sense filtering, which disconnects
the CS terminal from the current sense comparator during the 100-ns interval
immediately following the rising edge of the OUT pin. This digital filtering, also
called leading-edge blanking, means that in most applications, no analog filtering
(RC filter) is required on CS. Compared to an external RC filter technique, the
leading-edge blanking provides a smaller effective CS to OUT propagation delay.
Note, however, that the minimum non-zero On-time of the OUT signal is directly
affected by the leading-edge-blanking and the CS to OUT propagation delay.
The overcurrent comparator is only intended for fault sensing, and exceeding the
overcurrent threshold causes a soft-start cycle.
FB
2
5
I
FB is the inverting input of the error amplifier. For best stability, keep FB lead
length as short as possible and FB stray capacitance as small as possible.
GND
5
13
GND is reference ground and power ground for all functions on this part.
NC
1, 3, 4, 6,
8, 9, 11, 14,
16, 18, 19
No connection pins


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