Tri-M Systems HE104 technical manual Example, RC1 RC2 RC3 RC4 RC5

23 June 2005

HE104MAN-V8 Manual

Note: that only the ESR of the output capacitor is used in the formula. It is assumed that the capacitor is purely resistive at the frequencies about 20kHz. Worst case output ripple is at highest input voltage. Ripple voltage is independent of load (for continuous mode).

Example

Vout = 5V, Vin = 28V, L1 = 55uH, frequency = 50kNz and three 330uF capacitor with 27 mohm ESR in parallel.

Vp –p =	0.009 ∙ 5∙ (1- ( 5 ))
		28

55∙ 10E6 ∙ 0.5 ∙ 10E5

3.6Bus Termination (Optional)

AC bus termination is provided by 5 “RC” SOIC packages (3 only for 8-bit PC/104 bus HE 104s), RC1 to RC5 and discrete components C20 and C27. Each RC package contains 16 resistor/capacitor combinations of 47R and 47PF with a common bus connected to the signal ground.

	RC1	RC2	RC3	RC4	RC5
1	GND	GND	GND	GND	GND
2	*SMEMW	IRQ10	*BACK6	SA11	SA3
3	AEN	LA22	SD9	*Refresh	BALE
4	IOCHRDY	IRQ11	DRQ6	SA12	SA4
5	SD0	LA21	*DACK7	DRQ1	IRQ3
6	SD1	LA20	SD11	SA13	SA5
7	SRDY	IRQ15	DRQ7	*DACK1	*DACK2
8	SD2	LA19	SD12	SA14	SA6
9	SD3	LA18	-----	SA15	SA7
10	GND	GND	GND	GND	GND
11	GND	GND	GND	GND	GND
12	SD7	*MEMR	SD15	*IOW	IRQ6
13	SD6	LA17	SD14	SA17	SA9
14	SD5	LA18	SD13	*IOR	IRQ5
15	SD4	IRQ12	SD10	SA16	SA8
16	DRQ2	LA23	SD8	*DACK3	IRQ4
17	SA19	*IOCS16	DRQ5	DRQ3	DA2
18	*SMEMR	*SBHE	*MEMW	IRQ7	SA1
19	SA18	*MEMCS16	*DACK5	SA10	SA0
20	GND	GND	GND	GND	GND

In addition, the following signals are terminated with discrete components.

-	TC C1 (330pF)
-	Reset C20 (330pF)
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