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參數資料
| 型號： | PJ3845BCS |
| 元件分類： | 穩壓器 |
| 英文描述： | 1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | PLASTIC, SOP-8 |
| 文件頁數： | 1/14頁 |
| 文件大小： | 841K |
| 代理商： | PJ3845BCS |
PJ3844B / PJ3845B
High Performance Current Mode Controller
1-14
2002.rev. A
he PJ3844B , PJ3845 series are high performance fixed
frequency current mode controllers. This is specifically
designed for Off-Line and DC-to-DC converter
applications offering the designer a cost effective solution
with minimal external components.This integrated circuits
feature 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.
Also included are protective features consisting of input
and reference undervoltage lockouts each with hysteresis,
cycle-by-cycle current limiting , programmable output
deadtime, and a latch for single pulse metering. Allowing
output deadtimes to be programmed from 50% to 70%.
This device is available in 8-pin dual-in-line plastic
packages as well as the 8-pin plastic surface mount (SOP-8).
The SOP-8 package has separate power and ground pins for
the totem pole output stage.
The PJ3844B is tailored for lower voltage applications
having UVLO thresholds of 16V (on) 10V (off). ThePJ3845B
is tailored for lower voltage applications having UVLO
thresholds of 8.5V(on) and 7.6V(off).
Trimmed Oscillator Discharge Current for Precise Duty
Cycle Control
Current Mode Operation to 500KHz
Automatic Feed Forward Compensation
Latching PWM for Cycle-By-Cycle Current Limiting
Internally Trimmed Reference with Undervoltage
Lockout
High Current Totem Pole Output
Input Undervoltage Lockout with Hystersis
Low Start-Up and Operating Current
Device
Operating Temperature
(Ambient)
Package
PJ3844/3845BCD
DIP-8
PJ3844/3845BCS
SOP-8
The document contains information on a new product.Specifications and information herein are subject to change without notice.
T
DIP-8
SOP-8
SIMPLIFIED BLOCK DIAGRAM
Pin numbers adjacent to terminals are for the 8-pin dual-in-line package. Pin numbers in parenthesis are for the SOP-8 package.
FEATURES
Pin: 1. Compensation
5. Gnd
2. Voltage Feedback
6. Output
3. Current Sense
7. Vcc
4. RT/CT
8. Vref
ORDERING INFORMATION
-20℃ TO +850C
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| PJ431BCY | 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 2.495 V, PSSO3 |
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