MC33285 Datasheet, PDF (3/5 Pages) Freescale Semiconductor, Inc – Automotive Dual High Side TMOS Driver

MC33285
Freescale Semiconductor, Inc.
Turn On Characteristics
The power FETs are turned on by charging their gate capacities with a current flowing out of pin OUT1 and OUT2.
During PWM, the values of table below are guaranteed. They are measured with 8nF on OUT1 and 16nF on OUT2.
- test condition : V_IN : ramp 0V to 2.5V or 2.5V to 5V.
Figure 1. Turn-on Behaviour
5V
IN
2.5V
V_CCP
THRIN2
IN
THRIN1
V_OUT1
V_VCC +7V
V_OUT2
20ms
V_OUT2
2.5V
IN
0V
V O U T 1_max
V_OUT1
0V
0 ton1
ton2 ton3
5V
IN
2.5V
VOUT2 _max
V_OUT2
0V
0
ton1 ton2 ton3
Voltage V _VCC
7V < V_VCC < 10V
10V < V_VCC < 20V
20V < V_VCC < 40V
Table 1 Turn on behaviour
Minimum V_OUT1,OUT2
after t_on1 = 100µsec
Minimum V _OUT1,OUT2
after t_on2 = 1.0msec
V_VCC - 0.7V
V_VCC - 0.7V
V_VCC - 0.7V
V_VCC + 5.95V
V_VCC + 9.35V
Minimum V_OUT1,OUT2
after t_on3 = 1.5msec
V_VCC + 7V
V_VCC + 11V
The output voltages at OUT1 and OUT2 are limited by controlling the current sources I _on1, I_on2 to avoid currrent flowing
through the external or the internal zener diode .
If Vcc + Vth (threshold voltage) is reached , the current sources are turned off.
- threshold V _TH1 for OUT1 output voltage control : 7V < V_TH1 < Vz
- threshold VTH2 for OUT2 output voltage control : 7V < V_TH2 < 15V
Turn off characteristics
The power FETs on OUT1 and OUT2 are turned off by discharging the gate capacity with the constant discharge current
I_OUToff .
- discharge current I_OUTxoff : IOUTxoff = 110µA
condition : V_OUTx > 0.5V ( V_IN < V_THRxIN )
Test conditions for switching off the power FETs :
- 1. IN open
- 2. Stages disabled via pin IN
- 3. Stage OUT1 disabled by an over current error
MC33285
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