33285_07 View Datasheet(PDF) - Freescale Semiconductor
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33285_07 Datasheet PDF : 13 Pages
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FUNCTIONAL DESCRIPTION
INTRODUCTION
FUNCTIONAL DESCRIPTION
INTRODUCTION
The power FETs are turned ON by charging their gate
capacities with a current flowing out of pins OUT1 and OUT2.
During PWM, the values of table below are guaranteed. They
are measured with 8.0 nF on OUT1 and 16 nF on OUT2. Test
condition VIN: ramp 0 V ≤ 2.5 V or 2.5 V ≤ 5.0 V.
5.0 V
IN
2.5 V
VCCP
VOUT2
20 ms
THRIN2
IN
THRIN1
VOUT1
VOUT2
VVCC + 7.0
2.5 V
IN
0V
VOUT1MAX
VOUT1
0V
0
tON1
tON2
tON3
5.0 V
IN
2.5 V
VOUT2MAX
VOUT2
0V 0
tON1 tON3
tON2
VOLTAGE VVCC
MINIMUM VOUT1, OUT2
AFTER TON1 = 100 µSEC
MINIMUM VOUT1,OUT2
AFTER TON2 = 1.0 µSEC
MINIMUM VOUT1,OUT2
AFTER TON3 = 1.5 µSEC
7.0 V < VVCC < 10 V
10 V < VVCC < 20 V
20 V < VVCC < 40 V
VVCC - 0.7 V
VVCC - 0.7 V
VVCC - 0.7 V
VVCC + 5.95 V
VVCC + 9.35 V
VVCC + 7.0 V
VVCC + 11 V
Figure 4. Turn On Behavior
Turn Off Characteristics
The output voltages at OUT1 and OUT2 are limited by
controlling the current sources ION1, ION2 to avoid current
flowing through the external or the internal zener diode.
When voltage power supply plus threshold voltage
(VCC + VTH) is reached, the current sources are turned OFF.
• Threshold VTH1 for OUT1 output voltage control is
7.0 V < VTH1 < VZ
• Threshold VTH2 for OUT2 output voltage control is
7.0 V < VTH2 < 15 V
The power FETs on OUT1 and OUT2 are turned OFF by
discharging the gate capacity with the constant discharge
current IOUTOFF.
• Discharge current IOUTxOFF is IOUTxOFF = 110 µA
condition: VOUT x > 0.5 V ( VIN < VTHRxIN )
• 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
Analog Integrated Circuit Device Data
Freescale Semiconductor
33285
7
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