NCV47551DAJGEVB_TEST_PROCEDURE - 676 KB

Test Procedure for the NCV47551DAJGEVB Evaluation Board
1. Connect the test setup as is shown in Figure 1. See Table 1 with required equipment.
- Letter F – Force line
- Letter S – Sense line
2. Select output current limit by connecting jumper J0 – J3.
- J0 – ILIM0 ~ 100 µA
- J1 – ILIM1 ~ 10 mA
- J2 – ILIM2 ~ 20 mA
- J3 – ILIM3 – RCSO3 position available for individual current limit setting by resistor from
range 127.5 Ω to 25.5 kΩ
3. Set Input Voltage and turn on Power Supply.
4. Enable chip by connecting external Voltage Source on appropriate EN jumper. Enable voltage
must be higher than 2.31 V.
5. Set load current (max 20 mA) and turn ON Load.
6. Monitor Output voltage, it’s given according to Equation 1.
(eq. 1)
7. Monitor CSO voltage on appropriate CSO connector. It should be max 2.55 V in steady state.
The CSO voltage is proportional to output current according to Equation 2.
(eq. 2)
8. Compare your results with measured results in Table 2.
2/7/2014
1
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Power Supply
Load
A - meter
V - meter
Voltage
Source
V - meter
Figure 1. Test Setup
Table 1: Required Equipment
Equipment
Power Supply
Voltage Source
Load
V - meter
A - meter
2/7/2014
Ranges
0 V – 45 V / 100 mA
0 V – 45 V
0 mA – 100 mA
0 V – 20 V
0 mA – 100 mA
2
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Figure 2. PCB Layout
Table 2: Measured Results
Value
Parameter
Test Conditions
Nominal
Measured
Output
Voltage
Vin = 13.5 V, Vout_nom = 5.1 V, Iout = 0.1 mA, RCSO = Short to ground
5.1
5.11
Vin = 13.5 V, Vout_nom = 5.1 V, Iout = 20 mA, RCSO = Short to ground
5.1
5.12
Vin = 13.5 V, Vout_nom = 5.1 V, Vout = 0 V, RCSO = 24.9 kΩ
0.102
0.11
Vin = 13.5 V, Vout_nom = 5.1 V, Vout = 0 V, RCSO = 249 Ω
10.2
10.6
Vin = 13.5 V, Vout_nom = 5.1 V, Vout = 0 V, RCSO = 127 Ω
20
20.8
Iout = 1 mA, R1 = 82 kΩ, R2 = 27 kΩ,
Cin = none, Cb = 10 nF, Cnoise = 10 nF,
f = 100 Hz, 0.5 Vp-p
80
86.4
Iout = 1 mA, R1 = 82 kΩ, R2 = 27 kΩ,
Cin = none, Cb = 10 nF, Cnoise = 10 nF,
f = 1 kHz, 0.5 Vp-p
70
Output
Current
PSRR
2/7/2014
Unit
V
mA
dB
3
89
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