DRV3201-Q1_16 Datasheet, PDF (40/60 Pages) Texas Instruments – DRV3201-Q1 3 Phase Motor Driver-IC for Automotive Safety Applications

DRV3201-Q1
SLVSBD6D – MAY 2012 – REVISED AUGUST 2015
www.ti.com
Typical Application (continued)
8.2.1.1 Design Requirements
The DRV3201-Q1 is optimized to work with the external components as shown in Figure 13, providing stable
operation for the input voltage.
8.2.1.2 Detailed Design Procedure
8.2.1.2.1 Power Consumption
The DRV3201-Q1 has been designed to drive six external power FETs with 250 nC gate charge at 30 kHz PWM
frequency. The necessary current for charging the gates of these external power FETs is delivered by the boost
converter. The three internal high-side gate-drivers and the three internal low-side gate-drivers are supplied out
of the boost converter. The following graphs show the total supply current consumption against the supply
voltage for varying boost load current.
200
I_Boost = 0mA
180
I_Boost = 5mA
I_Boost = 20mA
160
I_Boost = 30mA
I_Boost = 40mA
140
120
100
80
60
40
20
T_A = 25°C
0
0
5
10
15
20
25
30
Supply Voltage (V)
G001
Gate pins loaded with MOSFET IRFS3004PBF
Used 560mA current setting
Figure 14. Supply Current vs. Supply Voltage for Varying
Boost Load Current at T_A = 25°C
200
I_Boost = 0mA
180
I_Boost = 5mA
I_Boost = 20mA
160
I_Boost = 30mA
I_Boost = 40mA
140
120
100
80
60
40
20
T_A = 125°C
0
0
5
10
15
20
25
30
Supply Voltage (V)
G002
Gate pins loaded with MOSFET IRFS3004PBF
Used 560mA current setting
Figure 15. Supply Current vs. Supply Voltage for Varying
Boost Load Current at T_A = 125°C
In these graphs, the quiescent current consumption from the boost converter taken by the non-switching gate-
drivers is taken into account (see, parameter R_GSa2 in Electrical Characteristics). However, the current
consumption from the boost converter due to gate-driver switching is not taken into account. This gate-driver
switching current, which forms the actual load current of the boost converter, consists of two components: the
internal gate-driver switching currents, and the external FET gate charging currents.
The switching current from the internal gate-drivers (without the external power FETs) is given in parameter
V_GS,HS,high in Electrical Characteristics, for 30 kHz PWM frequency and all six gate-drivers.
The total load current Iboost is given by the sum of Equation 1 and Equation 2:
rivers switching. The expected current consumption from the boost converter due to switching gate-drivers
(without the external power FETs) can be calculated as follows:
l_boost,sw
=
f_PWM
g
#FETs g l_boost,swmax
30 kHZ g 6
=
f_PWM g #FETs g 3 mA
30 kHZ g 6
(1)
40
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