UC1843-SP PWM controller Datasheet

UC1843-SP Datasheet, PDF, Equivalent


Part Number

UC1843-SP

Description

current-mode PWM controller

Manufacture

etcTI

Total Page 14 Pages
Datasheet
Download UC1843-SP Datasheet


UC1843-SP
UC1843-SP
www.ti.com
QML CLASS V, CURRENT-MODE PWM CONTROLLER
Check for Samples: UC1843-SP
SLUS981 – MARCH 2010
FEATURES
1
• QML-V Qualified, SMD 5962-86704
• Rad-Tolerant: 50 kRad (Si) TID (ELDRS Free) (1)
• 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
(1) Radiation tolerance is a typical value based upon initial device
qualification with dose rate = 10 mrad/sec. Radiation Lot
Acceptance Testing is available - contact factory for details.
JG PACKAGE
(TOP VIEW)
COMP
V
FB
I
SENSE
R /C
TT
1
2
3
4
8V
REF
7V
CC
6 OUTPUT
5 GROUND
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
34 V
UVLO
5V
S/R REF
2.50 V
47
RT/CT
OSC
Error
Amp
VREF
Good
Logic
2R
Internal
BIAS
T
S
VFB 2 3
COMP 1 1
CURRENT
SENSE
3
5
R
R
1 V CURRENT
SENSE
COMPARATOR
Note 1: A/B A = DIL−8 Pin Number. B = SO−14 and CFP−14 Pin Numbe.r
PWM
LATCH
8 14
VREF
5V
50 mA
7 11
VC
6 10
OUTPUT
58
POWER
GROUND
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 © 2010, Texas Instruments Incorporated

UC1843-SP
UC1843-SP
SLUS981 – MARCH 2010
www.ti.com
TA
–55°C to 125°C
ORDERING INFORMATION(1)
PACKAGE (2)
KGD
JG
ORDERABLE PART NUMBER
5962-8670410V9A (3)
5962-8670410VPA (3)
JG 5962-8670402VPA
FK 5962-8670402VXA
TOP-SIDE MARKING
NA
8670410VPA / UC1843-SP
8670402VPA / UC1843
5962-8670402VXA /
UC1843LQMLV
(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
(3) Radiation tolerant version
BARE DIE INFORMATION
DIE THICKNESS
15 mils.
BACKSIDE FINISH
Silicon with backgrind
BACKSIDE
POTENTIAL
Insulated
BOND PAD
METALLIZATION COMPOSITION
AlCu (0.5%)
a
b
c
d
DESCRIPTION
COMP
VFB
ISENSE
RT/CT
PWR GROUND
GROUND
OUTPUT
VC
VCC
VREF
NC
NC
NC
NC
NC
Origin
Table 1. BOND PAD COORDINATES (in Mils)
PAD NUMBER
1
2
3
4
5
6
7
8
9
10
TESTPAD
TESTPAD
TESTPAD
TESTPAD
TESTPAD
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
Product Folder Link(s): UC1843-SP
Copyright © 2010, Texas Instruments Incorporated


Features UC1843-SP www.ti.com QML CLASS V, CURR ENT-MODE PWM CONTROLLER Check for Sampl es: UC1843-SP SLUS981 – MARCH 2010 FEATURES 1 • QML-V Qualified, SMD 596 2-86704 • Rad-Tolerant: 50 kRad (Si) TID (ELDRS Free) (1) • Controlled Bas eline • Optimized For Off-line and DC -to-DC Converters • Low Start-Up Curr ent (<1 mA) • Automatic Feed Forward Compensation • Pulse-by-Pulse Current Limiting • Enhanced Load Response Ch aracteristics • Under-Voltage Lockout With Hysteresis • Double Pulse Suppr ession • High Current Totem Pole Outp ut • Internally Trimmed Bandgap Refer ence • 500-kHz Operation • Low RO E rror Amp xxx (1) Radiation tolerance is a typical value based upon initial dev ice qualification with dose rate = 10 m rad/sec. Radiation Lot Acceptance Testi ng is available - contact factory for d etails. JG PACKAGE (TOP VIEW) COMP V FB I SENSE R /C TT 1 2 3 4 8V REF 7V CC 6 OUTPUT 5 GROUND DESCRIPTION The U C1843 family of control devices provides the necessary features to implement off-line or dc-t.
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