Anterwell Technology Ltd.
Anterwell Technology Ltd.
Large Original stock of IC Electronics Components, Transistors, Diodes etc.
High Quality, Reasonable Price, Fast Delivery.
Anterwell Technology Ltd.
Large Original stock of IC Electronics Components, Transistors, Diodes etc.
High Quality, Reasonable Price, Fast Delivery.
Product Details:
Payment & Shipping Terms:
|
| Supply Voltage (low Impedance Source): | 30 V | Output Current: | ±1 A |
|---|---|---|---|
| Output Energy (capacitive Load): | 5 µJ | Error Amplifier Output Sink Current: | 10 MA |
| Storage Temperature Range: | – 65 To 150 °C | Junction Operating Temperature: | – 40 To 150 °C |
| High Light: | electronic chip board,electronic components ic |
||
HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER
FEATURES
■ TRIMMED OSCILLATOR DISCHARGE CURRENT
■ 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 HYSTERESIS
■ LOW START-UP CURRENT (< 0.5mA) DOUBLE PULSE SUPPRESSION
Figure 1. Package Table 1. Order Codes
| Part Number | Package |
|
UC2842AD1; UC3842AD1; UC2843AD1; UC3843AD1; UC2844AD1; UC3844AD1; UC2845AD1; UC3845AD1 |
SO-8 |
|
UC2842AN; UC3842AN; UC2843AN; UC3843AN; UC2844AN; UC3844AN; UC2845AN; UC3845AN |
DIP-8 |
DESCRIPTION
The UC384xA family of control ICs provides the necessary features to implement off-line or DC to DC fixed frequency current mode control schemes with a minimal external parts count. Internally implemented circuits include a trimmed oscillator for precise DUTY CYCLE CONTROL under voltage lockout featuring start-up current less than 0.5mA, a precision reference trimmed for accuracy at the error amp input, logic to insure latched operation, a PWM comparator which also provides current limit control, and a totem pole output stage designed to source or sink high peak current. The output stage, suitable for driving N-Channel MOSFETs, is low in the off-state.
Differences between members of this family are the under-voltage lockout thresholds and maximum duty cycle ranges. The UC3842A and UC3844A have UVLO thresholds of 16V (on) and 10V (off), ideally suited off-line applications The corresponding thresholds for the UC3843A and UC3845A are 8.5 V and 7.9V. The UC3842A and UC3843A can operate to duty cycles approaching 100%. A range of the zero to < 50 % is obtained by the UC3844A and UC3845A by the addition of an internal toggle flip flop which blanks the output off every other clock cycle.
Figure 2. Block Diagram (toggle flip flop used only in UC3844A and UC3845A)
Table 2. Absolute Maximum Ratings
| Symbol | Parameter | Value | Unit |
| Vi | Supply Voltage (low impedance source) | 30 | V |
| Vi | Supply Voltage (Ii < 30mA) | Self Limiting | |
| IO | Output Current | ±1 | A |
| EO | Output Energy (capacitive load) | 5 | µJ |
| Analog Inputs (pins 2, 3) | – 0.3 to 5.5 | V | |
| Error Amplifier Output Sink Current | 10 | mA | |
| Ptot | Power Dissipation at Tamb ≤ 25 °C (DIP-8) | 1.25 | W |
| Ptot | Power Dissipation at Tamb ≤ 25 °C (SO-8) | 800 | mW |
| Tstg | Storage Temperature Range | – 65 to 150 | °C |
| TJ | Junction Operating Temperature | – 40 to 150 | °C |
| TL | Lead Temperature (soldering 10s) | 300 | °C |
* All voltages are with respect to pin 5, all currents are positive into the specified terminal.
High Power Rectifier Diode 1N4756A , Silicon Planar Zener Diodes
Bridge Type Rectifier Diode 1N4007 50 to 1000 Volts 1.0 Ampere
1N4742A Silicon Planar Zener Diodes for Stabilized Power Supply
Power Programmable IC Chips XC6SLX100-3FGG484C Spartan-6 Family Overview
128K Bytes Sound IC Chip Programming ATMEGA128-16AU 8 Bit Microcontroller
EMC Programmable IC Chips Compliant Slew Rate Limited EI , Timer IC Chip
SMD Power Mosfet Module L7812CV TO-220 Power Trans Electronic Compoents
2SD1594 3 Pin Transistor NEC NPN Power Transistor Switching High Speed
2N5459 Power Mosfet Transistor N-Channel To-92 Original Stock FSC
