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PJ3842B 데이터시트 PDF




ETC에서 제조한 전자 부품 PJ3842B은 전자 산업 및 응용 분야에서
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부품번호 PJ3842B 기능
기능 High Performance Current Mode Controller
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PJ3842B 데이터시트, 핀배열, 회로
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
-20TO +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 pdf, 반도체, 판매, 대치품
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

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PJ3842B 전자부품, 판매, 대치품
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

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관련 데이터시트

부품번호상세설명 및 기능제조사
PJ3842B

High Performance Current Mode Controller

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(PJ3842B / PJ3843B) High Performance Current Mode Controller

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