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What is HY3843?

This electronic component, produced by the manufacturer "Hooyi", performs the same function as "(HY3842 / HY3845) PWM controller".


HY3843 Datasheet PDF - Hooyi

Part Number HY3843
Description (HY3842 / HY3845) PWM controller
Manufacturers Hooyi 
Logo Hooyi Logo 


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HY3842/43/44/45
DESCRIPTION
The HY3842D-N/3843D-N/3844D-N/3845D-N, are fixed frequency
current mode PWM controller. They are specially designed for OFFLine and DC to DC
converter applications with a minimal external components. Internally implemented circuits
include a trimmed oscillator for precise duty cycle control, a temperature compensated
reference, high gain error amplifier, current sensing comparator, and a high current totem pole
output ideally suited for driving a power MOSFET. Protection circuitry
includes built under voltage lockout and current limiting.
The HY3842D-N, HY3844D-N, have UVLO thresholds of 16 V (on) and 10 V (off).
The corresponding thresholds for the HY3843D-N/3845D- N are 8.4V (on) and 7.6V (off).
The HY3842D-N, HY3843D-N, can operate within 100% duty cycle. The HY3844D-N,
HY3845D-N, can operate within 50% duty cycle.
The HY384XD-N have Start-Up Current 0.17mA (typ).
PIN CONNECTION
(TOP VIEW)
FEATURES
Low Start-Up and Operating Current
High Current Totem Pole Output
Under voltage Lockout With Hysteresis
Operating Frequency Up To 500KHz
BLOCK DIAGRAM
(toggle flip flop used only in HY3844, HY3845)
Absolute Maximum Ratings
Characteristic
Supply Voltage (low impedance source)
Output Current
Input Voltage (Analog Inputs pins 2,3)
Error Amp Output Sink Current
Power Dissipation (TA=250C)
Storage Temperature Range
Lead Temperature (soldering 5 sec.)
Symbol
VCC
IO
VI
ISINK (E.A)
PO
Tstg
TL
Value
30
±1
0.3 to 5.5
10
1
-65 to150
260
1
Unit
V
A
V
mA
W
oC
oC
www.hooyi-semi.com
Free Datasheet http://www.nDatasheet.com

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HY3843 equivalent
HY3842/43/44/45
SCR must be selected for a holding current of less than 0.5mA.
The simple two transistor circuit can be used in place of the SCR as shown.
Figure 5. Latched Shutdown
Figure 6. Error Amplifier Compensation
5
www.hooyi-semi.com
Free Datasheet http://www.nDatasheet.com


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HY3843 datasheet


1. Datasheet PDF - PWM controller

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Featured Datasheets

Part NumberDescriptionMFRS
HY3842The function is (HY3842 / HY3845) PWM controller. HooyiHooyi
HY3843The function is (HY3842 / HY3845) PWM controller. HooyiHooyi
HY3844The function is (HY3842 / HY3845) PWM controller. HooyiHooyi

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