The UTC UC3842A/3843A provide the necessary functions to implement off-line or DC to DC fixed frequency current mode , controlled switching circuits with a minimal external part count SOP-8 FEATURES *Low external part count. *Low start up current ( Typical 0.12mA ) *Automatic feed forward compensation *Pulse-by-Pulse current limiting *Under-voltage lockout .
*Low external part count.
*Low start up current ( Typical 0.12mA )
*Automatic feed forward compensation
*Pulse-by-Pulse current limiting
*Under-voltage lockout with hysteresis
*Double pulse Suppression
*High current totem pole output to drive MOSFET directly
*Internally trimmed band gap reference
*500kHz operation
DIP-8
BLOCK DIAGRAM
7
Vcc
Vref
8
Internal Bias 1/2Vref
5V REF
S/R
5 GND
Vref Good Logic 1/3Vref U.V.L.O CURRENT SENSE COMPARATOR R PWM LATCH S
7
Vcc
VFB COMP
2 1
ERROR AMPLIFIER 1V
6
OUTPUT
CURRENT SENSE 3
RT/CT
4
5 GND
OSCILLATOR
ABSOLUTE MAXIMUM RATINGS(Ta=25°C)
P.
No. | Partie # | Fabricant | Description | Fiche Technique |
---|---|---|---|---|
1 | UTC3842 |
YOUWANG ELECTRONICS |
Current Mode PWM Controller | |
2 | UTC3843A |
UNISONIC TECHNOLOGIES |
PWM Controller | |
3 | UTC3843D |
YOUWANG |
PWM CONTROLLER | |
4 | UTC3843E |
YOUWANG |
PWM CONTROLLER | |
5 | UTC386 |
Hangzhou Silan Microelectronics |
LOW VOLTAGE AUDIO POWER AMPLIFIER | |
6 | UTC31001 |
Unisonic Technologies |
TELEPHONE TONE RINGER | |
7 | UTC31002 |
Unisonic Technologies |
TELEPHONE TONE RINGER | |
8 | UTC31002A |
Unisonic Technologies |
TELEPHONE TONE RINGER | |
9 | UTC31101 |
YOUWANG ELECTRONICS |
Voice Compander | |
10 | UTC317 |
YOUWANG ELECTRONICS |
3-TERMINAL 1.5A POSITIVE ADJUSTABLE VOLTAGEREGULATOR | |
11 | UTC317B |
YOUWANG ELECTRONICS |
3-TERMINAL 1.5A POSITIVE ADJUSTABLE VOLTAGEREGULATOR | |
12 | UTC317TB |
YOUWANG ELECTRONICS |
3-TERMINAL 1.5A POSITIVE ADJUSTABLE VOLTAGEREGULATOR |