PJ3843B Просмотр технического описания (PDF) - Promax Johnton
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PJ3843B Datasheet PDF : 14 Pages
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PJ3842B / PJ3843B
High Performance Current Mode Controller
FIGURE 21-33 WATT OFF-LINE FLYBACK CONVERTER
WITH SOFT-START AND PRIMARY POWER LIMITING
TEST
CONDITIONS
Line Regulation 5.0V
Line Regulation± 12V
Line Regulation 5.0V
Line Regulation± 12V
Line Regulation 5.0V
Line Regulation± 12V
Efficiency
Vin=95 to 135 Vac, Io=3.0A
Vin=95 to 135 Vac, Io=±0.75A
Vin=115 Vac, Io=1.0 to 4.0A
Vin=115 Vac, Io=±0.4 to ±0.9A
Vin=115 Vac, Io=3.0A
Vin=115 Vac, Io=±0.75A
Vin=115 Vac, Io 5.0V=3.0A
Vin=115 Vac, Io ±12=±0.75A
RESULTS
20mV 0.40%
52mV 0.26%
476mV 9.5%
300mV 2.5%
45 mVp-p P.A.R.D.
75 mV p-p P.A.R.D.
74%
T1
Coilcraft 11-464-16, 0.025” gap in each
leg
Baobbin：
Coilcraft 37-573
Windings：
Primary, 2 each:
75 turns #26 Awg Bifilar wound
Feedback：
15 turns #26 Awg
Secondary , 5.0V：
6 turns #22 Awg Bifiar wound
Secondary , 5.0V：
14 turns #24 Awg Bifiar wound
L1
Coilcraft Z7156. 15μF @ 5.0A
L2,L3
Coilcraft Z7157. 25μF @ 1.0A
PIN FUNCTION DESCRIPTION
Pin No.
1
Function
Compensation
2
Voltage Feedback
3
Current Sense
4
RT/CT
5
Gnd
6
Output
7
Vcc
8
Vref
Description
This pin is the Error Amplifier output and is made available for loop compensation
This is the inverting input of the Error Amplifier. It is normally connected to the
switching power supply output through a resistor divider.
A voltage proportional to inductor current is connected to this input.
The PWM uses this information to terminate the output switch conduction.
The Oscillator Frequency and maximum Output duty are programmed by connecting
resistor RT to Vref and capacitor CT to ground operation to 500kHz is possible.
This pin is the combined control circuitry and power ground (8-pin package only).
This output directly drives the gate of a power MOSFET.Peak current up to 1.0A are
soured and sunk by this pin.
This pin is the positive supply of the control IC.
This pin is the reference output . It provides charging current for capacitor CT
through resistor RT.
12-14
2004/11.Rev B
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