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MC34065 Datasheet(PDF) 4 Page - ON Semiconductor

Part No. MC34065
Description  HIGH PERFORMANCE DUAL CHANNEL CURRENT MODE CONTROLLER
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

MC34065 Datasheet(HTML) 4 Page - ON Semiconductor

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MC34065 MC33065
4
MOTOROLA ANALOG IC DEVICE DATA
PIN FUNCTION DESCRIPTION
Pin
Function
Description
1
Sync Input
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 1.0 A 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 1.0 A 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
This is the 5.0 V reference output. It can provide bias for any additional system circuitry.
16
VCC
This pin is the positive supply of the control IC. The minimum operating voltage range after startup
is 11 V to 15.5 V.
Figure 1. Timing Resistor versus
Oscillator Frequency
Figure 2. Maximum Output Duty Cycle
versus Oscillator Frequency
4.0
6.0
8.0
10
14
16
fosc, OSCILLATOR FREQUENCY (Hz)
12
3.3 nF
500 pF
220 pF
330 pF
5.0 nF
1.0 nF
10 k
30 k
50 k
300 k 500 k
100 k
1.0 M
100 pF
fosc, OSCILLATOR FREQUENCY (Hz)
38
40
42
44
48
50
46
Output 2
Output 1
10 k
30 k
50 k
300 k 500 k
100 k
1.0 M
VCC =15 V
RT = 4.0 k to 16 k
CL =15 pF
TA = 25°
CT =
10 nF
VCC =15V
TA =25°C
2.2 nF


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