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PWM CONTROLLER. 3843CM Datasheet

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PWM CONTROLLER. 3843CM Datasheet
















3843CM CONTROLLER. Datasheet pdf. Equivalent













Part

3843CM

Description

CURRENT MODE PWM CONTROLLER



Feature


Data Sheet CURRENT MODE PWM CONTROLLER G eneral Description The AP3842C/3C/4C/5C are high performance fixed frequency c urrent-mode PWM controller series. Thes e integrated circuits are optimized for off-line and DC-DC converter applicati ons with minimum external components. T hey feature under-voltage lockout www.D ataSheet4U.com (UVLO) circuit with low start-up current, .
Manufacture

BCD Semiconductor

Datasheet
Download 3843CM Datasheet


BCD Semiconductor 3843CM

3843CM; trimmed oscillator for precise duty cycl e control, current sense comparator pro viding maximum current limiting and a t otem pole output stage for increasing o utput current. In addition, these ICs a lso feature accurate protection against over-temperature, over-current and max imal output power. The AP3842C and AP38 44C have UVLO thresholds of 16V(on) and 10V(off); The cor.


BCD Semiconductor 3843CM

responding thresholds for AP3843C and AP 3845C are 8.4 V(on) and 7.6V(off). The AP3842C and AP3843C can operate approac hing 100% duty cycle; AP3844C and AP384 5C can operate from zero to 50% duty cy cle. These ICs are available in SOIC-8 and DIP-8 packages. AP384XC Features · · · · · · · · Low Start-up Current: 50µA Robust VREF Line/Load Re gulation Low Line Regulatio.


BCD Semiconductor 3843CM

n : 4mV Low Load Regulation : 4mV High S tability of Reference Voltage over a Fu ll Temperature Range: 0.2mV/ oC Operati ng Frequency up to 500KHz High PWM Freq uency Stability over a Full Temperature Range: 2.5% High PWM Frequency Stabili ty under a Full Supply Voltage Range: 0 .2% Accurate Over-temperature Protectio n with Hysteresis UVLO with Hysteresis Applications · · .




Part

3843CM

Description

CURRENT MODE PWM CONTROLLER



Feature


Data Sheet CURRENT MODE PWM CONTROLLER G eneral Description The AP3842C/3C/4C/5C are high performance fixed frequency c urrent-mode PWM controller series. Thes e integrated circuits are optimized for off-line and DC-DC converter applicati ons with minimum external components. T hey feature under-voltage lockout www.D ataSheet4U.com (UVLO) circuit with low start-up current, .
Manufacture

BCD Semiconductor

Datasheet
Download 3843CM Datasheet




 3843CM
CURRENT MODE PWM CONTROLLER
General Description
Features
Data Sheet
AP384XC
The AP3842C/3C/4C/5C are high performance fixed
frequency current-mode PWM controller series.
These integrated circuits are optimized for off-line and
DC-DC converter applications with minimum external
www.DataSheet4U.ccoommponents. They feature under-voltage lockout
(UVLO) circuit with low start-up current, trimmed
oscillator for precise duty cycle control, current sense
comparator providing maximum current limiting and a
totem pole output stage for increasing output current.
In addition, these ICs also feature accurate protection
against over-temperature, over-current and maximal
output power.
The AP3842C and AP3844C have UVLO thresholds
of 16V(on) and 10V(off); The corresponding thresh-
olds for AP3843C and AP3845C are 8.4 V(on) and
7.6V(off).
· Low Start-up Current: 50µA
· Robust VREF Line/Load Regulation
Low Line Regulation : 4mV
Low Load Regulation : 4mV
· High Stability of Reference Voltage over a Full
Temperature Range: 0.2mV/ oC
· Operating Frequency up to 500KHz
· High PWM Frequency Stability over a Full Tem-
perature Range: 2.5%
· High PWM Frequency Stability under a Full Sup-
ply Voltage Range: 0.2%
· Accurate Over-temperature Protection with Hys-
teresis
· UVLO with Hysteresis
Applications
The AP3842C and AP3843C can operate approaching · Off-line Converter
100% duty cycle; AP3844C and AP3845C can operate · DC-DC Converter
from zero to 50% duty cycle.
· Voltage Adapter
· CRT Monitor Power Supply
These ICs are available in SOIC-8 and DIP-8 pack- · Desktop Power Supply
ages.
· DVD/STB Power Supply
SOIC-8
DIP-8
Sep. 2006 Rev. 1. 1
Figure 1. Package Types of AP3842C/3C/4C/5C
BCD Semiconductor Manufacturing Limited
1




 3843CM
CURRENT MODE PWM CONTROLLER
Pin Configuration
www.DataSheet4U.com
P/M Package
(DIP-8/SOIC-8)
COMP
VFB
ISENSE
RT/CT
18
27
36
45
VREF
VCC
OUTPUT
GND
Figure 2. Pin Configuration of AP3842C/3C/4C/5C (Top View)
Data Sheet
AP384XC
Pin Description
Pin Number
1
2
3
4
5
6
7
8
Pin Name
COMP
VFB
ISENSE
RT/CT
GND
OUTPUT
VCC
VREF
Function
This pin is the Error Amplifier output and is made available for loop compensation.
The inverting input of the Error Amplifier. It is normally connected to the switching
power supply output through a resistor divider.
A voltage proportional to inductor current is connected to this input. The PWM uses
this information to terminate the output switch conduction.
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 possi-
ble.
The combined control circuitry and power ground.
This output directly drives the gate of a power MOSFET. Peak currents up to 1.0 A are
sourced and sunk by this pin.
The positive supply of the control IC.
This is the reference output. It provides charging current for capacitor CT through
resistor RT.
Sep. 2006 Rev. 1. 1
BCD Semiconductor Manufacturing Limited
2




 3843CM
CURRENT MODE PWM CONTROLLER
Functional Block Diagram
Data Sheet
AP384XC
VCC 7
GND
www.DataSheet4U.com
5
RT/CT 4
VFB
COMP
ISENSE
2
1
3
34V
2.50V
OSC
ERROR
AMP
UVLO
S/R
5V
REF
INTERNAL
BIAS
8 VREF
VREF
GOOD
LOGIC
T
OUTPUT
6
OVER TEMP
PROTECT
2R
R 1V
(Note)
S
R
CURRENT
SENSE
COMPARATOR
PWN
LATCH
Note: Toggle flip-flop used
for 3844C/45C only
Figure 3. Functional Block Diagram of AP3842C/3C/4C/5C
Sep. 2006 Rev. 1. 1
BCD Semiconductor Manufacturing Limited
3




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