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부품번호 | PJ3842B 기능 |
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기능 | High Performance Current Mode Controller | ||
제조업체 | ETC | ||
로고 | |||
PJ3842B
High Performance Current Mode Controller
The PJ3842B series is high performance fixed frequency
current mode controllers. This is specifi cally designed
for Off-Line and DC-to-DC convert er applications offering
the designer a cost effective solution with minimal external
components.This integrated circuits feature a trimmed
oscillator for precis e 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.
FEATURES
• Trimmed Oscillator Discharge Current for Precise Duty
Cycle Control
• Current Mode Operation to 500KHz
• Automatic Feed Forward Compensation
• Latching PWM for Cycle-By-Cycl e Current Limiting
• Internally Trimmed Reference with Undervoltage
Lockout
• High Current Totem Pole Output
• Input Undervoltage Lockout with Hystersis
• Low Start-Up and Operating Current
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.
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 PJ3842B has UVLO thresholds of 16V (on) and
10V (off), ideally suited for off-line converters.
DIP-8
SOP-8
P in: 1. Compensation
2. Voltage Feedback
3. Current Sense
4. RT/CT
5. Gnd
6. Output
7. Vcc
8. Vref
ORDERING INFORMATION
Device
PJ3842BCD
PJ3842BCS
Operating Temperature
-20℃ TO +85℃
Package
DIP-8
SOP-8
SIMPLIFIED BLOCK DIAGRAM
The document contains information on a new product.Specifications and information herein are subject to change without notice.
1-15 2002/01.ver.A
PJ3842B
High Performance Current Mode Controller
FIGURE 1- OUTPUT DEAD TIME versus
OSCILLATOR FREQ UENCY
FIGURE 2- TIMING RESISTOR versus
OSCILLATOR FREQ UENCY
FIGURE 3-OSCILLATOR DISCHARGE CURRENT
versus TEMPERATURE
FIGURE 4-MAXIMUM OUTPUT DUTY CYCLE
versus TIMING RESISTOR
FIGURE 5-ERROR AMP SMALL SIGNAL
TRANSIENT RESPONSE
FIGURE 6-ERROR AMP LARGE SIGNAL
TRANSIENT RESPONSE
4-15 2002/01.ver.A
4페이지 PJ3842B
High Performance Current Mode Controller
FIGURE 17-REPRESENTATIVE BLOCK DIAGRAM
Pin numbers adjacent to terminals are for the 8 pin dual-in-line package.
Pin numbers in parenthesis are for the SOP-14 package.
FIGURE 18-TIMING DIAGRAM
UNDERVOLTAGE LOCKOUT
Two undervoltage lockout comparators have been
incorporat ed to guarantee that the IC is fully functional before
the output stage is enabled. The positive power supply
terminal (VCC) and the referen ce output (Vref) are each
monitored by separate comparators.Each has built-in
hysteresis to prevent erratic output behavior as their
respective thresholds are crossed. The large hysteresis and
low start-up current of the PJ3842B makes it ideally suited in
off-line converter applications where effi cient bootstrap start -
up technique (Figure 33). 36 V zener is connected as a shunt
regulator from VCC to ground.Its purpose is to protect the IC
from excessive voltage that can occur during system start-up.
The minimum operating voltage for the PJ3842B is 11V.
7-15 2002/01.ver.A
7페이지 | |||
구 성 | 총 15 페이지수 | ||
다운로드 | [ PJ3842B.PDF 데이터시트 ] |
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구매 문의 | 일반 IC 문의 : 샘플 및 소량 구매 ----------------------------------------------------------------------- IGBT, TR 모듈, SCR 및 다이오드 모듈을 포함한 광범위한 전력 반도체를 판매합니다. 전력 반도체 전문업체 상호 : 아이지 인터내셔날 사이트 방문 : [ 홈페이지 ] [ 블로그 1 ] [ 블로그 2 ] |
부품번호 | 상세설명 및 기능 | 제조사 |
PJ3842B | High Performance Current Mode Controller | ETC |
PJ3842B | (PJ3842B / PJ3843B) High Performance Current Mode Controller | Promax-Johnton Semiconductor |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |