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UC3842D

Description
Switching Regulator/Controller, Current-mode, 0.2A, 500kHz Switching Freq-Max, BIPolar, PDSO14,
CategoryPower/power management    The power supply circuit   
File Size70KB,8 Pages
ManufacturerPhilips Semiconductors (NXP Semiconductors N.V.)
Websitehttps://www.nxp.com/
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UC3842D Overview

Switching Regulator/Controller, Current-mode, 0.2A, 500kHz Switching Freq-Max, BIPolar, PDSO14,

UC3842D Parametric

Parameter NameAttribute value
Is it Rohs certified?incompatible
package instructionSOP, SOP14,.25
Reach Compliance Codeunknown
control modeCURRENT-MODE
JESD-30 codeR-PDSO-G14
JESD-609 codee0
Number of terminals14
Maximum operating temperature70 °C
Minimum operating temperature
Maximum output current0.2 A
Package body materialPLASTIC/EPOXY
encapsulated codeSOP
Encapsulate equivalent codeSOP14,.25
Package shapeRECTANGULAR
Package formSMALL OUTLINE
Certification statusNot Qualified
surface mountYES
Maximum switching frequency500 kHz
technologyBIPOLAR
Temperature levelCOMMERCIAL
Terminal surfaceTin/Lead (Sn/Pb)
Terminal formGULL WING
Terminal pitch1.27 mm
Terminal locationDUAL
Base Number Matches1
Philips Semiconductors Linear Products
Product specification
Current-mode PWM controller
UC3842
DESCRIPTION
The UC3842 is available in an 8-Pin mini-DIP the necessary
features to implement off-line, fixed-frequency current-mode control
schemes with a minimal external parts count. This technique results
in improved line regulation, enhanced load response characteristics,
and a simpler, easier to design control loop. Topological advantages
include inherent pulse-by-pulse current limiting.
Protection circuitry includes built-in undervoltage lock-out and
current limiting. Other features include fully-latched operation, a 1%
trimmed bandgap reference, and start-up current less than 1mA.
These devices feature a totem-pole output designed to source and
sink high peak current from a capacitive load, such as the gate of a
power MOSFET. Consistent with N-channel power devices, the
output is low in the OFF-state.
PIN CONFIGURATIONS
N Package
COMP
V
FB
I
SENSE
R
T
/C
T
1
2
3
4
TOP VIEW
8
7
6
5
V
REF
V
CC
OUTPUT
GROUND
D Package
COMP
1
2
3
4
5
6
7
TOP VIEW
14
V
REF
13
NC
12
V
CC
11
V
C
10
OUTPUT
9
8
GROUND
POWER GROUND
FEATURES
NC
V
FB
NC
I
SENSE
NC
R
T
/C
T
Low start-up current (≤1mA)
Automatic feed-forward compensation
Pulse-by-pulse current limiting
Enhanced load response characteristics
Undervoltage lock-out with hysteresis
Double pulse suppression
High current totem-pole output
Internally-trimmed bandgap reference
400kHz operation, guaranteed min
BLOCK DIAGRAM
APPLICATIONS
Off-line switched mode power supplies
DC-to-DC converters UC3842
7(11)
(12)7
V
CC
34V
(9)5
GND
16V
2.5V
INTERNAL
BIAS
6V
UVLO
S/R
5V
REF
V
8(14)
REF
5.0V
50mA
(7)4
R
T
/C
T
OSC
6(10)
OUTPUT
ERROR
AMP
V
FB
COMP
CURRENT
SENSE
NOTE:
Pin numbers in parentheses refer to the D package.
(3)2
(1)1
(5)3
+
S
2R
R
R
1V
CURRENT
SENSE
COMPARATOR
PWM
LATCH
5(8)
August 31, 1994
1100
853-0614 13721

UC3842D Related Products

UC3842D UC3842N
Description Switching Regulator/Controller, Current-mode, 0.2A, 500kHz Switching Freq-Max, BIPolar, PDSO14, Switching Regulator/Controller, Current-mode, 0.2A, 500kHz Switching Freq-Max, BIPolar, PDIP8,
Is it Rohs certified? incompatible incompatible
package instruction SOP, SOP14,.25 DIP, DIP8,.3
Reach Compliance Code unknown unknown
control mode CURRENT-MODE CURRENT-MODE
JESD-30 code R-PDSO-G14 R-PDIP-T8
JESD-609 code e0 e0
Number of terminals 14 8
Maximum operating temperature 70 °C 70 °C
Maximum output current 0.2 A 0.2 A
Package body material PLASTIC/EPOXY PLASTIC/EPOXY
encapsulated code SOP DIP
Encapsulate equivalent code SOP14,.25 DIP8,.3
Package shape RECTANGULAR RECTANGULAR
Package form SMALL OUTLINE IN-LINE
Certification status Not Qualified Not Qualified
surface mount YES NO
Maximum switching frequency 500 kHz 500 kHz
technology BIPOLAR BIPOLAR
Temperature level COMMERCIAL COMMERCIAL
Terminal surface Tin/Lead (Sn/Pb) Tin/Lead (Sn/Pb)
Terminal form GULL WING THROUGH-HOLE
Terminal pitch 1.27 mm 2.54 mm
Terminal location DUAL DUAL
Base Number Matches 1 1
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