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PDF PJ3845B Data sheet ( Hoja de datos )
| Número de pieza | PJ3845B | |
| Descripción | (PJ3844B / PJ3845B) High Performance Current Mode Controller | |
| Fabricantes | Promax-Johnton Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de PJ3845B (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
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PJ3844B / PJ3845B
High Performance Current Mode Controller
T he PJ3844B , PJ3845 series are high performance fixed
frequency current mode controllers. This is specifically
cycle-by-cycle current limiting , programmable output
deadtime, and a latch for single pulse metering. Allowing
designed for Off-Line and DC-to-DC converter applications output deadtimes to be programmed from 50% to 70%.
offering the designer a cost effective solution with minimal
This device is available in 8-pin dual-in-line plastic
external components.This integrated circuits feature a packages as well as the 8-pin plastic surface mount (SOP-8).
trimmed oscillator for precise duty cycle control, a The SOP-8 package has separate power and ground pins for
temperature compensated reference, high gain error amplifier, the totem pole output stage.
current sensing comparator,and a high current totem pole
The PJ3844B is tailored for lower voltage applications
output ideally suited for driving a power MOSFET.
having UVLO thresholds of 16V (on) 10V (off). ThePJ3845B
Also included are protective features consisting of input is tailored for lower voltage applications having UVLO
and reference undervoltage lockouts each with hysteresis, thresholds of 8.5V(on) and 7.6V(off).
FEATURES
y Trimmed Oscillator Discharge Current for Precise Duty
Cycle Control
y Current Mode Operation to 500KHz
y Automatic Feed Forward Compensation
y Latching PWM for Cycle-By-Cycle Current Limiting
y Internally Trimmed Reference with Undervoltage Lockout
y High Current Totem Pole Output
y Input Undervoltage Lockout with Hystersis
y 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
ORDERING INFORMATION
5. Gnd
6. Output
7. Vcc
8. Vref
Device
PJ3844/3845BCD
PJ3844/3845BCS
Operating Temperature
(Ambient)
-20℃ TO +850C
Package
DIP-8
SOP-8
SIMPLIFIED BLOCK DIAGRAM
Pin numbers adjacent to terminals are for the 8-pin dual-in-line package. Pin numbers in parenthesis are for the SOP-8 package
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  
PJ3844B / PJ3845B
High Performance Current Mode Controller
FIGURE 7-REFERENCE VOLTAGE CHANGE versus
SOURCE CURRENT
FIGURE 8-REFERENCE SHORT CIRCUIT CURRENT
versus TEMPERATURE
FIGURE 9-REFERENCE LOAD REGULATION
FIGURE 10-REFERENCE LINE REGULATION
FIGURE 11- OUTPUT SATURATION VOLTAGE versus FIGURE 12-OUTPUT WAVEFORM
LOAD CURRENT
5-14 2004/11. Rev B
5 Page 
PJ3844B / PJ3845B
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 PJ3845B.PDF ] | |
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