HY3842 Datasheet PDF - Hooyi
Part Number | HY3842 | |
Description | (HY3842 / HY3845) PWM controller | |
Manufacturers | Hooyi | |
Logo | ||
There is a preview and HY3842 download ( pdf file ) link at the bottom of this page. Total 9 Pages |
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DESCRIPTION
The HY3842D-N/3843D-N/3844D-N/3845D-N, are fixed frequency
current mode PWM controller. They are specially designed for OFF−Line 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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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
Preview 5 Page |
Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for HY3842 electronic component. |
Information | Total 9 Pages | |
Link URL | [ Copy URL to Clipboard ] | |
Download | [ HY3842.PDF Datasheet ] |
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