R2A25107KFP Datasheet, PDF (17/24 Pages) Renesas Technology Corp – Intelligent Power Device for MOSFET Pre-drive

R2A25107KFP
Preliminary
Motor Over-Current Detection Circuit
This IC contains a motor over-current detection circuit. Figure 8 shows the block diagram of this circuit and figure 9
shows the timing chart when over-current is detected.
This circuit monitors the MCS pin voltage. If the MCS voltage exceeds the over-current detection threshold voltage
(Vth_MCS) of 1.1 V typical, motor over-current detection signal (ILIM) is output to the MCU by the time the motor over-
current detection filtering time (t_FLT) of 3 s max. has elapsed.
When motor over-current is detected, the over-current detection output remains low until a high level signal pulse (with
a pulse width longer than the over-current detection latch clear pulse width, t_MCR of 1 s min.) is applied to the MCR
pin.
<R2A25107KFP>
+B
*T
I*T
HIGH SIDE
PREDRIVER
*
I*B
PRE INPUT
MATRIX
MUTE
*B
MCU
LOW SIDE
PREDRIVER
*G
MCD
OVER-CURRENT
+
–
DETECTION
MCR
MCS
SGND
Figure 8 Block Diagram of Motor Over-Current Detection Circuit
VMCS
0V
VCC
VMCD
0V
VCC
VMCR
0V
Vth_MCS
T_FLT
10%
Vhys_MCS
90%
T_DLY
50%
90%
T_DLY
50%
T_MCR
Figure 9 Timing Chart of Motor Over-Current Detection Circuit
R07DS0689EJ0100 Rev.1.00
Mar 22, 2012
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