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Propagation Delay Test

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NOTE: This is a work in progress, not meant to be of use to anyone. This circuit is used as a coil driver, with overcurrent protection. As drawn, current limit is about 4A. If the current is exceeded, the driver is shut off until the next rising edge of the command signal.


This is for testing the propagation delays throughout a coil driver circuit. This uses a P-channel Mosfet as the high side driver. The gate is driven by means of an N-channel mosfet. This allows the output to be controlled using standard TTL level signals. The target is to have an end to end delay of less than 1 uS.


Current sensing is done on the high side. There is a current limit set by means of R1. R6 can be used, but with caution - consult the datasheet for the current sense amplifier.

If the current limit is reached, then the output is turned off. The output will be reactivated on the next rising edge of the input signal.

UPDATE August 10, 2021: Assembled board with corrections as outlined in previous updates. The overall delay measures about 200nS.  I used a pot for the current limit, as mentioned on the schematic. I used a through hole resistor for R3 since I forgot to reduce the footprint to a 0805. 





PCB_Propagation delay test


ID Name Designator Footprint Quantity
1 330uF C1 CAP-TH_BD10.0-P5.00-D1.0-FD 1
2 0.1u C2,C3,C4,C5 C0805 4
3 1.0uF C6 C0805 1
4 10nF C7 C0805 1
5 1SMB5913BT3G D1 SMB_L4.6-W3.6-LS5.3-RD 1
6 S1G-E3/61T D2,D3 SMA_L4.4-W2.6-LS5.0-RD 2
7 1SMB5936BT3G D4 SMB_L4.6-W3.6-LS5.3-RD 1
8 HDR-F-2.54_1x2 H1,H2 HDR-F-2.54_1X2 2
9 Wurth H.D. 2 pin Terminal J1,J2 WURTH DUAL 2 PIN CONN 2
10 5017 J6,J10,U2,U4,U8,U12,U14,U15,U16 TEST-SMD_L3.4-P1.8 9
11 SQD50P06-15L-GE3 Q1 TO-252-2_L6.6-W6.1-P4.57-LS9.9-BR-CW 1
12 51k R1 R0805 1
13 10k R2 R0805 1
14 3 to 6 ohm R3 R2010 1
15 910 R4 R2010 1
16 LVK24R050DER R5 LVK24R050DER 1
18 240 R7 R2010 1
19 SN74LVC1G175DBVR U1 SOT-23-6_L2.9-W1.6-P0.95-LS2.8-BR 1
20 MC74VHC1G08DTT1G U3 TSOP-5_L3.0-W1.5-P0.95-LS2.8-BL 1
21 INA301A1QDGKRQ1 U5 VSSOP-8_L3.0-W3.0-P0.65-LS5.0-BL 1
22 S-352T U7 S-352T 1
23 TLP2710(TP,E U9 TLP2710 1
24 IRLM220ATF U11 SOT-233-4 1
25 LM2940IMP-5.0 U13 SOT-223-4_L6.5-W3.5-P2.30-LS7.0-BR 1




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