MC33023DW ON Semiconductor, MC33023DW Datasheet - Page 11

• Manufacturer Part Number: MC33023DW
• Description: IC CTRLR PWM SGL END HF 16-SOIC
• Manufacturer: ON Semiconductor

Specifications of MC33023DW

• Pwm Type: Voltage/Current Mode
• Number Of Outputs: 1
• Frequency - Max: 1MHz
• Duty Cycle: 90%
• Voltage - Supply: 10 V ~ 30 V
• Buck: No
• Boost: No
• Flyback: No
• Inverting: No
• Doubler: No
• Divider: No
• Cuk: No
• Isolated: Yes
• Operating Temperature: -40°C ~ 105°C
• Package / Case: 16-SOIC (0.300", 7.5mm Width)
• Frequency-max: 1MHz
• Duty Cycle (max): 90 %
• Output Voltage: 5.05 V to 5.15 V
• Output Current: 500 mA
• Mounting Style: SMD/SMT
• Switching Frequency: 1000 KHz
• Operating Supply Voltage: 30 V
• Maximum Operating Temperature: + 105 C
• Fall Time: 30 ns
• Minimum Operating Temperature: - 40 C
• Rise Time: 30 ns
• Synchronous Pin: Yes
• Topology: Flyback, Forward
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Amplifier from 0% to 90% duty cycle is from 2.25 V to 4.05 V.
DIP/SOIC
In voltage mode operation, the control range on the output of the Error
Pin
10
11
12
13
14
15
16
1
2
3
4
5
6
7
8
9
Feedback Input
Output Voltage
Figure 22. Voltage Mode Operation
C
Reference Input
Power Ground
T
Inverting Input
Current Limit/
Noninverting
Current Limit
Ramp Input
Error Amp
Error Amp
Error Amp
Soft−Start
Shutdown
Function
Ground
Output
Output
Clock
Input
V
V
R
C
V
V
CC
ref
ref
C
T
T
4
5
6
7
3
1
2
This pin is usually used for feedback from the output of the power supply.
This pin is used to provide a reference in which an error signal can be produced on the output of the
error amp. Usually this is connected to V
This pin is provided for compensating the error amp for poles and zeros encountered in the power
supply system, mostly the output LC filter.
This is a bidirectional pin used for synchronization.
The value of R
In conjunction with R
For voltage mode operation this pin is connected to C
connected through a filter to the current sensing element.
A capacitor at this pin sets the Soft−Start time.
This pin has two functions. First, it provides cycle−by−cycle current limiting. Second, if the current is
excessive, this pin will reinitiate a Soft−Start cycle.
This pin is the ground for the control circuitry.
This pin voltage sets the threshold for cycle−by−cycle current limiting.
This 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.
This is a separate power source connection for the outputs that is connected back to the power source
input. With a separate power source connection, it can reduce the effects of switching transient noise
on the control circuitry.
This is a high current totem pole output.
This pin is the positive supply of the control IC.
This is a 5.1 V reference. It is usually connected to the noninverting input of the error amplifier.
1.25 V
Oscillator
T
PIN FUNCTION DESCRIPTION
sets the charge current through timing Capacitor, C
T
, the timing Capacitor sets the switching frequency.
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11
to filter the leading edge spike caused by turn−on of a power MOSFET.
In current mode control, an RC filter should be placed at the ramp input
ref
Sense Element
From Current
, however an external reference can also be used.
Feedback Input
Output Voltage
Figure 23. Current Mode Operation
Description
T
. For current mode operation this pin is
C
T
V
ref
T
4
5
6
7
3
1
.
2
1.25 V
Oscillator