MAX14871_14 Datasheet, PDF (4/15 Pages) Maxim Integrated Products – 4.5V to 36V Full-Bridge DC Motor Driver

MAX14871
4.5V to 36V Full-Bridge DC Motor Driver
AC Electrical Characteristics
(V_DD = 4.5V to 36V, T_A = T_MIN to T_MAX, unless otherwise noted. Typical values are at V_DD = 12V, T_A = +25°C)(Note 3)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP MAX
PWM Frequency
f_SW
EN = Low, Switching signal applied
at PWM
50
UNITS
kHz
Dead Time
M1, M2 Slew Rate
M1, M2 High-Side Propagation
Delay
t_DEAD
SR
t_PR
R_L = 1kΩ, C_L = 50pF, PWM/DIR ris-
ing, Figure 1
140
ns
200
V/μs
620
ns
M1, M2 Low-Side Propagation
Delay
t_PF
R_L = 1kΩ, C_L = 50pF, PWM/DIR fall-
ing, Figure 1
583
ns
Fixed Off-Time with Internal
VREF Current Regulation
PWM = High, EN = Low, V_SNS >
t_{OFF_D}
V_{SNS_IVR_THR}, VVREF < VVREF_
7.8
15
22
μs
TH, ^{TCOFF unconnected}
Current Regulation Minimum
On-Time
Overcurrent Blanking Time
t_{CR_BL}
t_{OC_BL}
PWM = High, EN = Low, V_SNS >
VSNS_IR_THR or VSNS_ER_THF
M1/M2 is shorted to V_DD or GND,
Figure 2
2.5
μs
1
μs
Overcurrent Autoretry Timeout
Enable Turn-on Delay
Enable Turn-off Delay
t_{OC_TO}
t_{EN_ON}
t_{EN_OFF}
PWM = High, EN = Low, I_M or I_M2 >
I_{M_OL}, Figure 2
PWM = High, R_L = 1kΩ, C_L = 50pF,
EN falling, M1/M2 rising to 10%,
Figure 3
PWM = High, R_L = 1kΩ, C_L = 50pF,
EN rising, M1/M2 falling to 90%,
Figure 3
2
ms
23
μs
50
μs
Note 2: All units are production tested at T_A = +25°C. Specifications over temperature are guaranteed by design.
Note 3: A_V is the fixed voltage gain of the internal current sense amplifier. It is the factor by which the V_SNS voltage is multiplied for
comparison with the external VREF voltage when using external VREF current regulation. See the Applications Information
section for more information.
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