PJ3842B Ver la hoja de datos (PDF) - Unspecified
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PJ3842B Datasheet PDF : 15 Pages
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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
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