DRV8701_15 Datasheet, PDF (15/42 Pages) Texas Instruments – DRV8701 Brushed DC Motor Full-Bridge Gate Driver

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DRV8701
SLVSCX5B – MARCH 2015 – REVISED JULY 2015
7.3.2 Half-Bridge Operation
The DRV8701 can be used to drive only a single half-bridge instead of a full H-bridge. To operate in this mode,
leave GH1 and GL1 disconnected. Also, connect a 1/10 W, 330-Ω 5% resistor from SH1 to GND.
PH/IN1
EN/IN2
nSLEEP
Control
Inputs
Gate
Drive
GH1
SH1
GL1
GH2
330
VM
nFAULT
SNSOUT
Logic
Outputs
Gate
Drive
+
A_V
-
SH2
GL2
SP
SN
SO
VREF
BDC
R_SENSE
Figure 20. Half-H Bridge Operation Mode
For the DRV8701E, this mode is controlled by tying the PH pin low. Table 3 gives the control scheme. EN = 1
enables the high-side FET, and EN = 0 enables the low-side FET. EN = 1 and PH = 1 is an invalid state.
nSLEEP
0
1
1
1
Table 3. DRV8701E (PH/EN) Control Interface for Half-H Bridge Mode
EN
PH
SH2
AVDD/DVDD
Description
X
X
High-Z
Disabled Sleep mode; disabled High-Z
0
X
L
Enabled Brake, low-side slow decay
1
0
H
Enabled Drive (Current SH2 → GND)
1
1
Invalid state
For the DRV8701P, Table 4 gives the control scheme. IN1 = 1 and IN2 = 0 is an invalid state.
nSLEEP
0
1
1
1
1
Table 4. DRV8701P (PWM) Control Interface for Half-H Bridge Mode
IN1
IN2
SH2
AVDD/DVDD
Description
X
X
High-Z
Disabled Sleep mode; disabled High-Z
0
0
High-Z
Enabled Coast; disabled High-Z
0
1
H
Enabled Drive (current SH2 → GND)
1
0
Invalid state
1
1
L
Enabled Brake; low-side slow decay
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