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Evaluation Board for LD7535
--- 10W (5V, 2A) Adapter
Tested by Reviewed by Approved by Simon Hsu
William Tang
Frank Shih
Total pages
Revision
Date
21 01 Dec.05,’05
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Contents
Ⅰ. Schematic (3)
Ⅱ.BOM (4)
Ⅲ. Test Report (5)
Ⅳ. Gerber file (16)
Ⅴ. Transformer specification (18)
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Ⅱ. BOM
P/N Component Value Original
R1A N/A R1B N/A R2A 2.2M Ω, 1206 R2B 2.2M Ω, 1206 R4A 39K Ω, 1206 R4B 39K Ω, 1206 R6 2.2Ω, 1206 R7 10Ω, 1206 RS1 2.49Ω, 1206, 1% RS2 2.49Ω, 1206, 1% RT 100K Ω, 0805, 1% R51A 100Ω, 1206 R51B 100Ω, 1206 R52 2.49K Ω, 0805, 1% R53 2.49K Ω, 0805, 1% R54 220Ω, 0805 R55 5.1K Ω, 0805 R56A N/A (note) R56B 1K Ω, 1206 NTC1 08SP005 FL1 UU9.8
T1 EI-22 (note)
TF-EE220-013
L51 2.7µH
P/N Component Value Note
C1 22µF, 400V L-tec C2 10µF, 50V C3 2.2uF, 50V C4 1000pF, 1000V, 1206 Holystone
C5 0.01µF, 16V, 0805 C51
1000pF, 50V, 0805
C52 1000µF, 10V C54 470µF, 10V C55 0.022µF, 16V, 0805
CX1 0.1µF X-cap
CY1 2200pF Y-cap D1A 1N4007 D1B 1N4007 D1C 1N4007 D1D 1N4007 D2 PS102R D3 1N4148 D4 1N4007 Q1 2N60B CR51 SB540 ZD51 6V2C IC1
LD7535
SOT-26 IC2 EL817B IC51 KA431, 1% F1 250V, 1A Z1 N/A
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Ⅰ. EXECUTIVE SUMMARY...............................................................................6 1. I NPUT V OLTAGE & F REQUENCY ........................................................................7 2. O UTPUT L OADS ..................................................................................................7 3. T URN O N D ELAY T IME .......................................................................................7 4. G REEN M ODE C ONSUMPTION ...........................................................................8 5. O PERATING E FFICIENCY ....................................................................................8 6. L INE /L OAD R EGULATION ..................................................................................9 7. O UTPUT D YNAMIC R ESPONSE ...........................................................................9 8. P EAK TO P EAK O UTPUT R IPPLE AND N OISE .....................................................11 9. O VER C URRENT P ROTECTION .........................................................................14 10. O UTPUT S HORT P ROTECTION (14)
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Ⅰ. EXECUTIVE SUMMARY
Office Taipei IC LD7535 Model Name LD7535 10W demo board (2 stage start up)
Version 03
TEST Result
Comments
3. Turn On Delay Time
Pass 4. Green Mode Power Consumption Pass 5. Operating Efficiency Pass 6. Line/Load Regulation Pass 7. Output Dynamic Response
Pass 8. Peak to Peak Output Ripple and Noise Pass 9. Over Current Protection Pass 10 Output Short Protection
Pass
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1. Input Voltage & Frequency
The unit shall be capable of operating as a universal AC input power supply accepting AC inputs. The power supply shall operate between the following two voltages (90V to 2V). The supply will be designed to operate for a Table 1.
Table 1
2. Output Loads
The loads and regulation for each of the outputs are shown in Table. 2.
Output V oltage Output Current Parameter
Minimum Typical Maximum Minimum Maximum
+5V 4.75V 5.0V 5.25V 0A 2.0A
Load Regulation / / ±1% 0A 2.0A
Load Dynamic 4.75V 5.0V 5.25V / 0~100%
Table 2
3. Turn On Delay Time
Turn on delay time will be less than 2.5 seconds at full load. Turn on delay time is measured as the delay between input voltage being applied at 0o phase angle and when the outputs arrive within 10% of their operating value. Turn on delay time is measured using an input voltage of 90V AC(rms) and input frequency of 60Hz.
Test Conditions: Input: 90Vac Output: 2A
Ambient Temperature : 25℃ Test Result: PASS
Input
T turn on delay (s)90Vac
1.36 Table 3
Minimum Normal Maximum
90Vac 110Vac 2Vac
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Turn on Time Test Fig.1Vin : 90Vac O/P: Max Load
CH1 : AC Input V oltage CH2 : +5V Reading : 1.36s
4. Green Mode Consumption
The input power of power supply shall remain less than 300mW under output at no load conditions.
Test Condition:
Input : 90Vac/2Vac Output : No Load
Ambient Temperature: 25℃ Test Result: PASS
V in (Vac) I in (mA rms ) Pin (mW)V o (Vdc)90 5.168 116.3 5.007 2 10.122 161.7 5.007
Table 4
5. Operating Efficiency
The operating efficiency is defined to be the percent ratio of the output power to the input power when the input and output (voltage and current) are within the min and max values as specified in tables 1 and table 2. Operating efficiency shall be calculated by measuring the output power of the supply and remain minimum 75%.
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Output Load Dynamic Response Fig.2
Vin : 90Vac
O/P : +5V= 0A→1A
CH1 : V O_+5V (offset 5V)
CH4 : I O_+5V
Reading : +5V Max=5.04V +5V Min=4.92V
Output Load Dynamic Response Fig.3
Vin : 90Vac
O/P : +5V= 1A→2A
CH1 : V O_+5V (offset 5V)
CH4 : I O_+5V
Reading : +5V Max=5.06V +5V Min=4.90V
Output Load Dynamic Response Fig.4
Vin : 90Vac
O/P : +5V= 0A→2A
CH1 : V O_+5V (offset 5V)
CH4 : I O_+5V
Reading : +5V Max=5.11V +5V Min=4.84V
Output Load Dynamic Response Fig.5
Vin : 2Vac
O/P : +5V= 0A→1A
CH1 : V O_+5V (offset 5V)
CH4 : I O_+5V
Reading : +5V Max=5.04V +5V Min=4.93V
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Output Load Dynamic Response Fig.6
Vin : 2Vac
O/P : +5V= 1A→2A
CH1 : V O_+5V (offset 5V)
CH4 : I O_+5V
Reading : +5V Max=5.06V +5V Min=4.90V
Output Load Dynamic Response Fig.7
Vin : 2Vac
O/P : +5V= 0A→2A
CH1 : V O_+5V (offset 5V)
CH4 : I O_+5V
Reading : +5V Max=5.11V +5V Min=4.85V 8. Peak to Peak Output Ripple and Noise
This refers to the peak-to-peak residual AC that remains on the DC power line after passing through all the filtering processes conducted within the power supply. The peak to peak output ripple and noise shall be considered to comprise of the complex envelope of the low frequency saw tooth voltage ripple and the high frequency switching noise. It shall be within 100mV and measured across output terminals using a single ended measurement with an oscilloscope (bandwidth limited to 20 MHz) and a high persistence display. Readings shall be made through the range of minimum to maximum load current.
Test Condition:
Input : 90Vac/2Vac (60Hz)
Output : Max/Min Load
Ambient Temperature : 25℃
Test Result: PASS
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Output Ripple/Noise Test Fig.8Vin : 90Vac O/P: +5V=0A CH1 : V P-P_+5V
Reading :7.00mV Output Noise Test Fig.9Vin : 90Vac O/P: +5V=0A CH1 : V P-P_+5V
Reading : 7.00mV
Output Ripple/Noise Test Fig.10Vin : 90Vac O/P: +5V=2A CH1 : V P-P_+5V
Reading : 30.2mV
Output Noise Test Fig.11Vin : 90Vac O/P: +5V=2A CH1 : V P-P_+5V
Reading : 30.2mV
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Output Ripple/Noise Test Fig.12
Vin : 2Vac
O/P: +5V=0A
CH1 : V P-P_+5V
Reading : 15.2mV
Output Noise Test Fig.13
Vin : 2Vac
O/P: +5V=0A
CH1 : V P-P_+5V
Reading : 12.0mV
Output Ripple/Noise Test Fig.14
Vin : 2Vac
O/P: +5V=2A
CH1 : V P-P_+5V
Reading : 35.8mV
Output Noise Test Fig.15
Vin : 2Vac
O/P: +5V=2A
CH1 : V P-P_+5V
Reading : 31.0mV
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9. Over Current Protection
The supply shall be designed with appropriate output over current protection. This protection shall be activated in the event of a short or long-term condition during which one or more of the output current load increases such that the primary current exceeds a predetermined limit. The
primary shall limit the total power without inflicting any damage to any internal supply components and shall be reversible pending removal of the cause of the condition and without any user intervention. Test Conditions:
Input: 90Vac/265Vac (60Hz) Ambient Temperature : 25℃ Test Result : PASS
Intput Result (A)
90Vac
2.84 265Vac
3.12 10. Output Short Protection
The supply shall be designed with appropriate output short circuit protection. This protection
shall be activated in the event of a short or long-term condition happened. The primary shall limit the total power without inflicting any damage to any internal supply components and shall be reversible pending removal of the cause of the condition and without any user intervention. Test Conditions:
Input: 90Vac/2Vac (60Hz) Ambient Temperature : 25℃ Test Result: PASS
Output Short Protection Fig.16Vin : 90Vac
Output : +5V=0A →Short CH1 : V +5V CH4 : I +5V Output Short Protection Fig.17Vin : 2Vac
Output : +5V=0A →Short CH1 : V +5V CH4 : I +5V
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Ⅳ. Gerber file:
Silkscreen Top
Silkscreen Bottom
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Bottom Layer
Solder mask Bottom
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Ⅴ. Transformer specification:
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