33486A Datasheet, PDF (21/30 Pages) Freescale Semiconductor, Inc – Dual High-Side Switch for H-Bridge Applications

FUNCTIONAL DESCRIPTION
FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
Table 5. TRUTH TABLE
Standard H-Bridge Conditions IN1
Normal Operation
X
0
1
0
1
IN2 WAKE OUT1 OUT GLS1 GLS2 ST
X
0
Z
Z
L
L
1
0
1
L
L
H
H
1
0
1
H
L
L
H
1
1
1
L
H
H
L
1
1
1
H
H
L
L
1
Comment
Standby Mode
Brake to Ground
Direction 1
Direction 2
Not Recommended
(9)
Undervoltage
X
X
1
L
L
H
H
1
(10)
Overvoltage
X
X
1
L
L
H
H
1
(10)
Overtemperature High-Side 1
H
L
1
L
L
H
H
0
(11)
Overtemperature High-Side 2
L
H
1
L
L
H
H
0
(11)
Overcurrent High-Side 1
1
X
1
Z
X
L
X
0
(12)
Overcurrent High-Side 2
X
1
1
X
Z
X
L
0
(12)
Overcurrent Low-Side 1
X
X
1
Z
Z
L
L
0
(13)
Overcurrent Low-Side 2
X
X
1
Z
Z
L
L
0
(13)
Legend
0, L = Low level.
1, H = High level.
X = Don’t care.
Z = High impedance.
Notes
9. In H-Bridge configuration it is not advisable to short the motor to V_BAT . If an overvoltage condition occurred in this mode, it would
damage the 33486A. The current recirculation in the low-side MOSFET is a preferred solution, with IN1 = 0 and IN2 = 0.
10. Once the overvoltage condition or undervoltage condition is removed, the H-Bridge recovers its normal operation mode.
11. When the thermal shutdown is reached on one of the high-side MOSFETs, both high sides are turned off with the motor tied to ground.
When the overtemperature condition is finished, the H-Bridge recovers it previous normal operation mode.
12. The high-side MOSFET HSn that experienced an overcurrent is latched off. The corresponding output OUTn is open. Once the high-
side overcurrent condition is removed, the input INn must be reset in order to recover the normal operation mode.
13. When a short to V_BAT of one of the low-side MOSFETs occurs, both outputs are opened to prevent the motor from running. Once the
low-side overcurrent is removed, the input INn of the output that experienced the fault must be reset in order to recover the normal
operation mode. Figure 22, Overload on Low-Side 1, page 18, shows an example. If an overload happens in low-side 1, OUT1 and
OUT2 are both put in high impedance. IN2 must be reset to recover normal mode.
Analog Integrated Circuit Device Data
Freescale Semiconductor
33486A
21