SLUSDD4B April   2019  – December 2020 UC1843B-SP

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 UVLO
      2. 7.3.2 Reference
      3. 7.3.3 Totem-Pole Output
    4. 7.4 Device Functional Modes
  8. 8 Application Information Disclaimer
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Switching Frequency
        2. 8.2.2.2 Transformer
        3. 8.2.2.3 RCD Diode Clamp
        4. 8.2.2.4 Output Diode
        5. 8.2.2.5 Output Filter and Capacitor
        6. 8.2.2.6 Compensation
        7. 8.2.2.7 Sense Resistor and Slope Compensation
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
      1. 10.1.1 Feedback Traces
      2. 10.1.2 Input/Output Capacitors
      3. 10.1.3 Compensation Components
      4. 10.1.4 Traces and Ground Planes
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Receiving Notification of Documentation Updates
    2. 11.2 Support Resources
    3. 11.3 Trademarks
    4. 11.4 Electrostatic Discharge Caution
    5. 11.5 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

5 Pin Configuration and Functions

GUID-E197D4D6-5842-4164-B474-B576A61560CB-low.svgFigure 5-1 HKU Package
10-Pin CFP
Top View
Table 5-1 Pin Functions
PIN I/O DESCRIPTION
NAME NO.
Comp 1 I Error amplifier output.
VFB 2 I Voltage feedback input to error amplifier.
ISENSE 3 I Current sense comparator input pin.
RT/CT 4 I RC time constant input to oscillator.
NC 5, 6 — No connect.
Gnd 7 — Ground.
Output 8 O Regulated output.
VCC 9 — Unregulated supply voltage.
VREF 10 O 5-V internally generated reference.
Table 5-2 Bare Die Information
DIE THICKNESS BACKSIDE FINISH BACKSIDE POTENTIAL BOND PAD METALLIZATION COMPOSITION BOND PAD THICKNESS
15 mils Backgrind Si - Finish Ground AlCu 2000 nm
GUID-20201001-CA0I-T0MD-PFDV-CBGLV8DVXJTJ-low.png Figure 5-2 UC1843B-SP Bare Die Pin Number Locations
Table 5-3 Bond Pad Coordinates in Microns
DESCRIPTION PAD NUMBER X MIN Y MIN X MAX Y MAX
COMP 1 55.88 1935.458 170.181 2052.3
VFB 2 55.88 1651.829 170.181 1768.671

ISENSE

3

55.88

925.028

170.181

1041.87

Rt/Ct

4

55.88

481.858

170.181

598.7

N/C

5

165.623

74.746

279.925

191.588

N/C

6

343.425

74.746

457.726

191.588

N/C

7

521.227

74.746

635.528

191.588

N/C

8

704.109

74.746

818.41

191.588

N/C

9

881.91

74.746

996.211

191.588

N/C

10

1062.932

74.746

1177.234

191.588

GND

11

1662.756

384.359

1777.057

501.201

GND

12

1449.69

481.858

1563.991

598.7

OUTPUT

13

1620.685

889.041

1734.986

1005.883

VCC

14

1620.685

1172.67

1734.986

1289.512

VCC

15

1620.685

1358.803

1734.986

1475.644

VREF

16

1620.685

1731.066

1734.986

1847.907

N/C

17

1523.03

2254.009

1637.331

2370.85

N/C

18

1345.228

2254.009

1459.529

2370.85

N/C

19

1162.346

2254.009

1276.647

2370.85

N/C

20

984.544

2254.009

1098.846

2370.85

N/C

21

806.742

2254.009

921.043

2370.85