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PDF PJ3842B Data sheet ( Hoja de datos )
| Número de pieza | PJ3842B | |
| Descripción | High Performance Current Mode Controller | |
| Fabricantes | ETC | |
| Logotipo |  |
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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
1 page  
PJ3842B
High Performance Current Mode Controller
FIGURE 7-ERROR AMP OPEN-LOOP GAIN AND
PHASE versus FREQ UENCY
FIGURE 8-CURRENT SENSE INPUT THRESHOLD
versus ERROR AMP OUTPUT VOLTAGE
FIGURE 9-REFERENCE VOLTAGE CHANGE
versus SOURCE CURRENT
FIGURE 10-REFERENCE SHORT CIRCUIT
CURRENT versus TEMPERATURE
FIGURE 11- REFERENCE LOAD REGULATION
FIGURE 12-REFERENCE LINE REGULATION
5-15 2002/01.ver.A
5 Page 
PJ3842B
High Performance Current Mode Controller
FIGURE 32-SLOPE COM PENSATION
The buffered oscillator ramp can resistively summed with either the voltage
feedback or current sense inputs to provide slope compensation.
FIGURE 33-27 W ATT OFF-LINE REGULATION
T1-Primary:45 Turns #26 AWG
Secondary ±12V :9 Turns #30 AWG (2 strands ) Bifiliar Wound
Secondary 5.0V: 4Turns (six strands) #26 Hexfiliar Wound
Secondary Feedback : 10 Turns #30 AWG (2 strands) Bifiliar Wound
Core: Ferroxcube EC35-3C8
Bobbin : Ferroxcube EC35PCB1
Gap :≌ 0.10” for a primary inductance of 1.0mH
L1-15μH at 5.0A, Coilcraft 27156.
L2.L3-25μH at 1.0A, Coilcraft 27157.
Line Regulation:5.0V
Vin=95 to 130 Vac
±12V
Load Regulation: 5.0V
Vin=115Vac, Iout =1.0A to 4.0A
±12V
Vin=115Vac,Iout=100mA to 300mA
Output Ripple: 5.0V
Vin=115Vac
±12V
Efficiency
Vin=115Vac
All outputs are at nominal load currents unless otherwise noted.
=50mV or ±0.5%
=24mV or ±0.1%
=300mV or ±3.0%
=60mV or ±0.25%
40mVp-p
80 Vp-p
70%
11-15
2002/01.ver.A
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet PJ3842B.PDF ] | |
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