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MC33065DW-L View Datasheet(PDF) - Motorola => Freescale

Part Name
Description
Manufacturer
MC33065DW-L Datasheet PDF : 14 Pages
1 2 3 4 5 6 7 8 9 10 Next Last
MC34065–H, L MC33065–H, L
Figure 17. External Clock Synchronization
Figure 18. External Duty Cycle Clamp and
Multi–Unit Synchronization
15
External
Sync
Input
220pF
1
3
RT
CT
2
4
5
R
Bias
R
20k
Osc.
+
EA1
2R
1.0V
R
The external diode clamp is required if the negative Sync current
is greater than –5.0 mA.
Vref
15
8
4
RA
6
5.0k
+
7
1
R
5
5.0k
Q
3
3
2
+
S
2
5.0k
MC1455
R
Bias
R
20k
Osc.
1
RB
C
1.08
f=
(RA + RB)C
4
+
5
EA1
2R
1.0V
R
To additional MC34065s
Dmax Drive Output 1 =
RB
RA + RB
Dmax Drive Output 2 =
RA
RA + RB
PIN FUNCTION DESCRIPTION
Pin
Function
1
Sync Input
Description
A narrow rectangular waveform applied to this input will synchronize the oscillator. A dc voltage
within the range of 2.4 V to 5.5 V will inhibit the oscillator.
2
CT
Timing capacitor CT connects from this pin to ground setting the free–running oscillator frequency
range.
3
RT
Resistor RT connects from this pin to ground precisely setting the charge current for CT. RT must be
between 4.0 k and 16 k.
4
Voltage Feedback 1
This pin is the inverting input of Error Amplifier 1. It is normally connected to the switching power
supply output through a resistor divider.
5
Compensation 1
This pin is the output of Error Amplifier 1 and is made available for loop compensation.
6
Current Sense 1
A voltage proportional to the inductor current is connected to this input. PWM 1 uses this information
to terminate conduction of output switch Q1.
7
Drive Output 1
This pin directly drives the gate of a power MOSFET Q1. Peak currents up to 400 mA are sourced
and sunk by this pin.
8
Gnd
This pin is the control circuitry ground return and is connected back to the source ground.
9
Drive Gnd
This pin is a separate power ground return that is connected back to the power source. It is used to
reduce the effects of switching transient noise on the control circuitry.
10
Drive Output 2
This pin directly drives the gate of a power MOSFET Q2. Peak currents up to 400 mA are sourced
and sunk by this pin.
11
Current Sense 2
A voltage proportional to inductor current is connected to this input. PWM 2 uses this information to
terminate conduction of output switch Q2.
12
Compensation 2
This pin is the output of Error Amplifier 2 and is made available for loop compensation.
13
Voltage Feedback 2
This pin is the inverting input of Error Amplifier 2. It is normally connected to the switching power
supply output through a resistor divider.
14
Drive Output 2 Enable A logic low at this input disables Drive Output 2.
15
Vref
16
VCC
This is the 5.0 V reference output. It can provide bias for any additional system circuitry.
This pin is the positive supply of the control IC. The minimum operating voltage range after startup is
11 V to 15.5 V for the –H suffix, 8.2 V to 9.5 V for the –L suffix.
MOTOROLA ANALOG IC DEVICE DATA
9
 

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