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PDF PJ3843B Data sheet ( Hoja de datos )
| Número de pieza | PJ3843B | |
| Descripción | (PJ3842B / PJ3843B) High Performance Current Mode Controller | |
| Fabricantes | Promax-Johnton Semiconductor | |
| Logotipo |  |
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PJ3842B / PJ3843B
High Performance Current Mode Controller
T he PJ3842B and PJ3843B series are high performance
fixed frequency current mode controllers. This is
cycle-by-cycle current limiting, programmable output
deadtime, and a latch for single pulse metering.
specifically designed for Off-Line and DC-to-DC converter
This device is available in 8-pin dual-in-line plastic
applications offering the designer a cost effective solution packages as well as the 8-pin plastic surface mount (SOP-8).
with minimal external components.This integrated circuits The SOP-8 package has separate power and ground pins for
feature a trimmed oscillator for precise duty cycle control, a the totem pole output stage.
temperature compensated reference, high gain error amplifier,
The PJ3842B has UVLO thresholds of 16V (on) and 10V
current sensing comparator,and a high current totem pole (off), ideally suited for off-line converters. The PJ3843B is
output ideally suited for driving a power MOSFET.
tailored for lowervoltage applications having UVLO
Also included are protective features consisting of input thresholds of 8.5V (on) and 7.6V (off).
and reference undervoltage lockouts each with hysteresis,
FEATURES
• 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
• Undervoltage Lockout with Hystersis
• Low Start-Up and Operating Current
DIP-8
SOP-8
Pin：1. Compensation
Pin：2. Voltage Feedback
Pin：3. Current Sense
Pin：4. RT/CT
5. Gnd
6. Output
7. Vcc
8. Vref
ORDERING INFORMATION
Device
PJ3842/3843BCD
PJ3842/3843BCS
Operating Temperature
(Ambient)
Package
-20℃ TO +85℃
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.
1-14 2004/11.Rev B
1 page  
PJ3842B / PJ3843B
High Performance Current Mode Controller
FIGURE 7-ERROR AMP OPEN-LOOP GAIN AND FIGURE 8-CURRENT SENSE INPUT THRESHOLD
PHASE versus FREQUENCY
versus ERROR AMP OUTPUT VOLTAGE
FIGURE 9-REFERENCE VOLTAGE CHANGE versus FIGURE 10-REFERENCE SHORT CIRCUIT CURRENT
SOURCE CURRENT
versus TEMPERATURE
FIGURE 11- REFERENCE LOAD REGULATION
FIGURE 12-REFERENCE LINE REGULATION
5-14 2004/11.Rev B
5 Page 
PJ3842B / PJ3843B
High Performance Current Mode Controller
FIGURE 32-SLOPE COMPENSATION
The buffered oscillator ramp can resistively summed with either the voltage
feedback or current sense inputs to provide slope compensation.
FIGURE 33-27 WATT OFF-LINE REGULATION
T1-Primary:45 Turns #26 AWG
Secondary ±12V :9 Turns #30 AWG (2 strands ) Bifiliar Wound
L1-15μH at 5.0A, Coilcraft 27156.
Secondary 5.0V: 4 Turns (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
L2.L3-25μH at 1.0A, Coilcraft 27157.
Line Regulation：5.0V
Vin=95 to 130 Vac
=50mV or ±0.5%
Line Regulation：±12V
=24mV or ±0.1%
Load Regulation：5.0V
Vin=115Vac, Iout =1.0A to 4.0A
=300mV or ±3.0%
Load Regulation：±12V
Vin=115Vac,Iout=100mA to 300mA
=60mV or ±0.25%
Output Ripple：5.0V
Vin=115Vac
40mVp-p
Output Ripple：±12V
80 Vp-p
Efficiency
Vin=115Vac
70%
All outputs are at nominal load currents unless otherwise noted.
11-14
2004/11.Rev B
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet PJ3843B.PDF ] | |
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