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AZ3842MM Datasheet(PDF) 2 Page - Advanced Analog Technology, Inc.

Part # AZ3842MM
Description  CURRENT MODE PWM CONTROLLER
Download  13 Pages
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Manufacturer  AAT [Advanced Analog Technology, Inc.]
Direct Link  http://www.aatech.com.tw
Logo AAT - Advanced Analog Technology, Inc.

AZ3842MM Datasheet(HTML) 2 Page - Advanced Analog Technology, Inc.

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CURRENT MODE PWM CONTROLLER
AZ3842/3/4/5
Advanced Analog Circuits
Data Sheet
2
March 2003
Rev: 1.0
Figure 2. Pin Configuration of AZ3842/3/4/5 (Top View)
P/M Package
(DIP-8/SOIC-8)
(SOIC-14)
Pin Configuration
COMP
ISENSE
VFB
RT/CT
8
VREF
7
VCC
6
OUTPUT
5
GND
1
2
3
4
N/C
VFB
N/C
ISENSE
N/C
RT/CT
COMP
14
VREF
13
N/C
12
VCC
11
PWR VC
10
OUTPUT
9
GND
8
PWR GND
1
2
3
4
5
6
7
Pin Description
Pin Number
Pin Name
Function
8-pin
14-pin
1
1
COMP
This pin is the Error Amplifier output and is made available for loop compensation.
23
VFB
The inverting input of the Error Amplifier. It is normally connected to the switching
power supply output through a resistor divider.
35
ISENSE
A voltage proportional to inductor current is connected to this input. The PWM uses
this information to terminate the output switch conduction.
47
RT/CT
The Oscillator frequency and maximum Output duty cycle are programmed by con-
necting resistor RT to VREF and capacitor CT to ground. Operation to 500 kHz is pos-
sible.
5
GND
The combined control circuitry and power ground.
6
10
OUTPUT
This output directly drives the gate of a power MOSFET. Peak currents up to 1.0 A
are sourced and sunk by this pin.
712
VCC
The positive supply of the control IC.
814
VREF
This is the reference output. It provides charging current for capacitor CT through
resistor RT.
8
PWR 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.
11
PWR VC
The Output high state (VOH) is set by the voltage applied to this pin. With a separate
power source connection, it can reduce the effects of switching transient noise on the
control circuitry.
9
GND
This pin is the control circuitry ground return and is connected back to the power
source ground.
2,4,6,13
N/C
No connection. These pins are not internally connected.
M Package


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