lb11600jv Sanyo Semiconductor Corporation, lb11600jv Datasheet - Page 22
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lb11600jv
Manufacturer Part Number
lb11600jv
Description
Brushless Motor Predriver Ic For Automotive Applications
Manufacturer
Sanyo Semiconductor Corporation
Datasheet
1.LB11600JV.pdf
(30 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
lb11600jv-MPB-E
Manufacturer:
SANYO/三洋
Quantity:
20 000
The time (n times the PWMIN period) required for the potential, which is increased by the V2 potential difference (∆V)
on each input pulse, to exceed the threshold voltage (Vth = 1.25V) is the reset period (Trest).
<PWMRE Reset Time Setting Example>
Since ∆V (0.644) is added on each PWMIN input pulse, and
the threshold voltage (1.25V) will be exceeded on the second pulse.
From the formula for the on time: t1' = CR × ln ((V0 – Ipwmre × R)/(V1 - Ipwmre × R))
Since the potential difference with respect to 1.25V due to the rise potential V2 of the second PWMIN pulse is 1.25 -
0.664 = 0.586V, 1.25V will be exceeded in the on duty state. Therefore,
Thus the reset time Trest will be one PWMIN period plus t1'.
V2 + ∆V + ∆V⋅⋅⋅ ≥ 1.25V
Trest ≤ TPWMIN × n (s)
V CC = 5V, PWMIN = 25kHz, on duty ratio = 20%
PWMRE:
PWMIN = 25kHz = 40µs
t1 = 40µs × 0.2 = 8µs
V1 = (V0 - Ipwmre × R) × e-t1/RC + Ipwmre × R
V2 = V1 × e-t2/RC
V2 + ∆V = 0.664 + 0.664 ≥ 1.25V
t1' = 2200pF × 180kΩ × ln ((0.664 – 200µA × 180kΩ) / (1.25 – 200µA × 180kΩ))
Trest = 40µs + 6.622µs = 46.622µs (s)
= 396µs × ln (35.336/34.75) = 6.622µs (s)
= (0 - 200µA × 180kΩ) × 0.98 + (200µA × 180kΩ)
= - 35.28 + 36 = 0.72 (V)
= 0.72 × 0.922 = 0.664 (V)
C = 2200pF, R = 180kΩ
t2 = 40µs × 0.8 = 32µs
LB11600JV
No.8321-22/30