Created on: 2/11/2014
PMP9311 Rev A1 Test Results
LM2842
Cap-Drop
TI reference design number: PMP9311 Rev A1
Input: 230VAC
Output: 3.3VDC @ 85mA
AC–DC Converter Test Results
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Power Management Solutions
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PMP9311 Rev A1 Test Results
Table of Contents
1. Circuit Description ....................................................................................................... 3
2. Fabrication .................................................................................................................. 3
3.1 Efficiency ................................................................................................................... 5
3.2 LM2842 Cap-Drop Efficiency Data ............................................................................ 5
3.3 LM2842 Cap-Drop VINAC at 50 Hz vs. IOUT (mA) .................................................... 6
4. Thermal ....................................................................................................................... 7
Top View...................................................................................................................... 7
5. Power Up ................................................................................................................... 8
5.1 Power Up at 230VAC Input – No Load Power Up at 230VAC Input – Zoom .......... 8
5.2 Power Up at 230VAC Input – 85mA Power Up at 230VAC Input – Zoom .............. 8
6. Switch Node Voltage and Output Ripple Voltage ....................................................... 9
6.1 230VAC Input – 85mA Load .................................................................................... 9
7. Transient Response ................................................................................................. 10
7.1 230VAC Input – 42mA to 85mA, 100mA/µs, 100 Hz, 50% duty cycle. .................. 10
8. Short Circuit Test....................................................................................................... 11
8.1 230VAC input - No Load
230VAC input – 85mA Load....................................... 11
9. Short Circuit Recovery Test ...................................................................................... 12
9.1 230VAC input - No Load
230VAC input – 85mA Load....................................... 12
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Power Management Solutions
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PMP9311 Rev A1 Test Results
1. Circuit Description
PMP9311 is a Capacitor Drop circuit that utilizes the LM2842 Buck Regulator. The EVM is intended to
work with an input of 230VAC (50 Hz). The output voltage is set to 3.3VDC at 85mA. Switching Frequency of the EVM is programed to 550 kHz. The EVM includes an external UVLO Circuit. PMP9311 is
suitable for 8VA 3-phase e-meters applications.
2. Fabrication
The LM2842 Cap-Drop circuit is a two layer board with overall dimensions of 1.925” (49mm) x 4.2”
(106mm). The copper weight is 1oz each layer.
Top Layer
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PMP9311 Rev A1 Test Results
Bottom Layer
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PMP9311 Rev A1 Test Results
3.1 Efficiency
All Efficiency measurements taken at Vin of 42V DC connected to C8
3.2 LM2842 Cap-Drop Efficiency Data
Vin
(VDC)
39.5
39.5
39.3
39.2
39.1
39.1
39.1
38.8
38.6
38.4
38.0
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Iin
(mADC)
1.00
2.96
4.40
5.20
6.02
6.82
7.63
8.46
9.28
10.23
11.10
Vout
(VDC)
3.30
3.27
3.26
3.26
3.26
3.26
3.26
3.25
3.25
3.25
3.25
Iout
(mADC)
0.00
7.77
16.15
24.77
33.16
41.76
50.24
58.70
67.18
75.78
84.26
Efficiency
(%)
Pin
(mW)
Pout
(mW)
Losses
(mW)
0.00%
21.75%
30.43%
39.61%
45.94%
51.08%
54.90%
58.12%
60.90%
62.62%
64.92%
39
117
173
204
235
267
298
328
358
393
422
0
25
53
81
108
136
164
191
218
246
274
39
91
120
123
127
130
134
137
140
147
148
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Created on: 2/11/2014
PMP9311 Rev A1 Test Results
3.3 LM2842 Cap-Drop VINAC at 50 Hz vs. IOUT (mA)
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PMP9311 Rev A1 Test Results
4. Thermal
4.1 Steady State Temperature - 230VAC in, 3.3VDC out at a load of 85mA
Top View
The RIN resistors are the warmest component on the PCB and display a temperature rise of 14°C
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PMP9311 Rev A1 Test Results
5. Power Up
5.1 Power Up at 230VAC Input – No Load
Power Up at 230VAC Input – Zoom
Channel 1 VINDC
Channel 2 Enable
Channel 3 VOUT
Channel 4 IINAC
5.2 Power Up at 230VAC Input – 85mA Power Up at 230VAC Input – Zoom
Channel 1 VINDC
Channel 2 Enable
Channel 3 VOUT
Channel 4 IINAC
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PMP9311 Rev A1 Test Results
6. Switch Node Voltage and Output Ripple Voltage
6.1 230VAC Input – 85mA Load
Less than 11mV p-p Ripple
Channel 2 VSW
Channel 3 VOUT
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PMP9311 Rev A1 Test Results
7. Transient Response
7.1 230VAC Input – 42mA to 85mA, 100mA/µs, 100 Hz, 50% duty cycle.
Cursors indicate ~7.9mV of deviation across the output capacitor.
Channel 2 VOUT
Channel 4 IOUTDC
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Created on: 2/11/2014
PMP9311 Rev A1 Test Results
8. Short Circuit Test
8.1 230VAC input - No Load
230VAC input – 85mA Load
Channel 2 VOUT
Channel 4 IOUT
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Power Management Solutions
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PMP9311 Rev A1 Test Results
9. Short Circuit Recovery Test
9.1 230VAC input - No Load
230VAC input – 85mA Load
Channel 2 VOUT
Channel 4 IOUT
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