M62055FP
1. Pin (3) (TC pin) Charging and Discharging Time
When an error is occurred in RD input, TC waveform is as shown in figure 1.
VTH1(H)
VO
0
output cutoff
VTH1(L)
↑ ≈0.9V
VTH2(H)
TC
VTH2(L)
0
tRST(1)
tWD
tRST(2)
tRST(1) = 0.406 ⋅ C ⋅ R1 + 300µs*1
tWD = 1.2 ⋅ C ⋅ R1 (Charging time)
Note: 1. Inside delay time (Typ)
Figure 1
VO = 3.0V
R1
3
C
The following formula can be obtained because tRST(2) is equal to the duration of VO cutoff.
tRST(2) = C ⋅ R*2 ⋅ ln
3
0.9
+ 300µs*3
= 40 ⋅ C + 300µs*3
Note: 2. R = Internal resistance
3. Inside delay time (Typ)
Figure 2
Al
C
cutoff Tr
Rev.2.00 Mar 10, 2006 page 5 of 9