UC1843-HIREL PWM controller Datasheet

UC1843-HIREL Datasheet, PDF, Equivalent


Part Number

UC1843-HIREL

Description

current-mode PWM controller

Manufacture

etcTI

Total Page 11 Pages
Datasheet
Download UC1843-HIREL Datasheet


UC1843-HIREL
UC1843-HiRel
www.ti.com .................................................................................................................................................. SLUS896A – AUGUST 2009 – REVISED AUGUST 2009
CURRENT MODE PWM CONTROLLER (KNOWN GOOD DIE)
FEATURES
1
–55°C to 125°C Known Good Die
Controlled Baseline
Optimized For Off-line and DC-to-DC
Converters
Low Start-Up Current (<1 mA)
Automatic Feed Forward Compensation
Pulse-by-Pulse Current Limiting
Enhanced Load Response Characteristics
Under-Voltage Lockout With Hysteresis
Double Pulse Suppression
High Current Totem Pole Output
Internally Trimmed Bandgap Reference
500-kHz Operation
Low RO Error Amp
xxx
DESCRIPTION
The UC1843 family of control devices provides the
necessary features to implement off-line or dc-to-dc
fixed frequency current mode control schemes with a
minimal external parts count. Internally implemented
circuits include under-voltage lockout featuring start
up current less than 1 mA, a precision reference
trimmed for accuracy at the error amp input, logic to
insure latched operation, a PWM comparator which
also provides current limit control, and a totem pole
output stage designed to source or sink high peak
current. The output stage, suitable for driving
N-Channel MOSFETs, is low in the off state. The
under-voltage lockout threshold is 8.4 V and
maximum duty cycle range is around 100%.
BLOCK DIAGRAM
Vcc 7 12
GROUND 5 9
47
RT/CT
VFB 2 3
COMP 1 1
CURRENT
SENSE
3
5
A/B
34 V
UVLO
5V
S/R REF
2.50 V
OSC
Error
Amp
VREF
Good
Logic
Internal
BIAS
2R
R
T
S
R
1 V CURRENT
SENSE
COMPARATOR
PWM
LATCH
8 14
VREF
5V
50 mA
7 11
VC
6 10
OUTPUT
58
POWER
GROUND
TA
–55°C to 125°C
ORDERING INFORMATION(1)
PACKAGE (2)
ORDERABLE PART NUMBER
KGD
UC1843KGD1
TOP-SIDE MARKING
NA
(1) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI
website at www.ti.com.
(2) Package drawings, thermal data, and symbolization are available at www.ti.com/packaging.
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2009, Texas Instruments Incorporated

UC1843-HIREL
UC1843-HiRel
SLUS896A – AUGUST 2009 – REVISED AUGUST 2009 .................................................................................................................................................. www.ti.com
BARE DIE INFORMATION
DIE THICKNESS
15 mils.
BACKSIDE FINISH
Silicon with backgrind
BACKSIDE
POTENTIAL
GND
BOND PAD
METALLIZATION COMPOSITION
Al-Si-Cu (0.5%)
a
b
c
d
DESCRIPTION
COMP
VFB
ISENSE
RT/CT
GROUND
GROUND
OUTPUT
VCC
VCC
VREF
NC
NC
NC
NC
NC
PAD NUMBER
1
2
3
4
5
6
7
8
9
10
TESTPAD
TESTPAD
TESTPAD
TESTPAD
TESTPAD
Origin
BOND PAD COORDINATES (in Mils)
a
78.70
70.60
39.40
18.60
17.80
17.40
32.60
47.50
54.60
68.70
87.10
87.10
87.10
87.10
87.10
b
63.40
63.40
63.40
61.20
11.70
3.90
6.40
6.40
6.40
6.40
6.30
12.60
18.00
24.30
30.60
c
82.90
74.80
43.60
22.60
22.00
21.80
36.80
51.70
58.80
72.90
90.80
90.80
90.80
90.80
90.80
d
67.60
67.60
67.60
65.60
15.90
8.10
10.60
10.60
10.60
10.60
10.30
16.60
22.00
28.30
34.60
2 Submit Documentation Feedback
Copyright © 2009, Texas Instruments Incorporated
Product Folder Link(s): UC1843-HiRel


Features UC1843-HiRel www.ti.com ............... ....................................... ....................................... ....................................... .............. SLUS896A – AUGUST 2009 – REVISED AUGUST 2009 CURRENT MODE P WM CONTROLLER (KNOWN GOOD DIE) FEATURE S 1 • –55°C to 125°C Known Good D ie • Controlled Baseline • Optimize d For Off-line and DC-to-DC Converters • Low Start-Up Current (<1 mA) • Au tomatic Feed Forward Compensation • P ulse-by-Pulse Current Limiting • Enha nced Load Response Characteristics • Under-Voltage Lockout With Hysteresis Double Pulse Suppression • High Cu rrent Totem Pole Output • Internally Trimmed Bandgap Reference • 500-kHz O peration • Low RO Error Amp xxx DESC RIPTION The UC1843 family of control de vices provides the necessary features t o implement off-line or dc-to-dc fixed frequency current mode control schemes with a minimal external parts count. In ternally implemented circuits include under-voltage lockout featuring start up current less than .
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