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HY3844のメーカーはHooyiです、この部品の機能は「(HY3842 / HY3845) PWM controller」です。 |
部品番号 | HY3844 |
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部品説明 | (HY3842 / HY3845) PWM controller | ||
メーカ | Hooyi | ||
ロゴ | |||
このページの下部にプレビューとHY3844ダウンロード(pdfファイル)リンクがあります。 Total 9 pages
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 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
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Free Datasheet http://www.nDatasheet.com
1 Page PIN FUNCTION
N FUNCTION
1 COMP
2 VFB
3 ISENSE
4 RT/CT
5 GROUND
6 OUTPUT
7 VCC
8 Vref
HY3842/43/44/45
DESCRIPTION
This pin is the Error Amplifier output and is made for loop compensation.
This is 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 connecting resistor RT
to Vref and capacitor CT to ground.
This pin is the combined control circuitry and power ground.
This output directly drives the gate of a power MOSFET. Peak currents up to 1A are sourced and sink
by this pin.
This pin is the positive supply of the integrated circuit.
This is the reference output. It provides charging current for capacitor CT through resistor RT .
APPLICATION INFORMATION
Figure 1. Error Amp Configuration
HY3842 HY3843
HY3844 HY3845
Figure 2. Under voltage Lockout
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3
Free Datasheet http://www.nDatasheet.com
3Pages HY3842/43/44/45
Figure 7. External Clock Synchronization
Figure 8. Soft-Start Circuit
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6
Free Datasheet http://www.nDatasheet.com
6 Page | |||
ページ | 合計 : 9 ページ | ||
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PDF ダウンロード | [ HY3844 データシート.PDF ] |
データシートを活用すると、その部品の主な機能と仕様を詳しく理解できます。 ピン構成、電気的特性、動作パラメータ、性能を確認してください。 |
部品番号 | 部品説明 | メーカ |
HY3842 | (HY3842 / HY3845) PWM controller | Hooyi |
HY3843 | (HY3842 / HY3845) PWM controller | Hooyi |
HY3844 | (HY3842 / HY3845) PWM controller | Hooyi |
HY3845 | (HY3842 / HY3845) PWM controller | Hooyi |