150mA USB LDO Regulators with ±15kV TVS
and µP Reset
200kΩ
JENNINGS
RELAY
RF3D-26S
80µH
HIGH
VOLTAGE
2µF
4kV
20Ω
D+/D-
TVS
DEVICE
UNDER
TEST
0.2µF
LEAKAGE
RELAY
IP 100%
AMPERES
50%
0
0 8µs
t1
40µs
t2
TIME
Figure 2. Surge Current Test Circut
12
10
COUT = 0
D+ OR D- TO GND
8
6 8/40µs PULSE WIDTH
4
2
0
0 2 4 6 8 10 12 14 16 18 20
VOLTAGE (V)
Figure 4. Surge Current I/V Characteristic (COUT = 0)
12
10 8/40µs PULSE WIDTH
8
6
COUT = 10µF
4 D+ OR D- TO GND
2
0
0 2 4 6 8 10 12 14 16 18
VOLTAGE (V)
Figure 6. Surge Current I/V Characteristic (COUT = 10µF)
Figure 3. Test Circuit Surge Current Waveform (Short-Circuit
Load)
12
10 8/40µs PULSE WIDTH
8
6
COUT = 1µF
4 D+ OR D- TO GND
2
0
0 2 4 6 8 10 12 14 16 18
VOLTAGE (V)
Figure 5. Surge Current I/V Characteristic (COUT = 1µF)
10 ______________________________________________________________________________________