- RS Stock No.:
- 661-5349
- Mfr. Part No.:
- UC3843N
- Brand:
- Texas Instruments
Available to back order for despatch 10/07/2024
Added
Price Each (In a Pack of 5)
£0.986
(exc. VAT)
£1.183
(inc. VAT)
Units | Per unit | Per Pack* |
5 - 120 | £0.986 | £4.93 |
125 - 495 | £0.678 | £3.39 |
500 - 1245 | £0.582 | £2.91 |
1250 - 2495 | £0.566 | £2.83 |
2500 + | £0.552 | £2.76 |
*price indicative |
- RS Stock No.:
- 661-5349
- Mfr. Part No.:
- UC3843N
- Brand:
- Texas Instruments
Technical Reference
Legislation and Compliance
Product Details
Flyback Controller, Current Control, UC18/UC28/UC38 Series, Texas Instruments
The isolated-flyback power supply controller provides Constant-Voltage (CV) and Constant-Current (CC) output regulation to improve transient response to large load steps. Primary-Side Regulation (PSR) eliminates the need for an Optocoupler.
The Texas Instruments UC3843 series of control integrated circuits provide the features that are necessary to implement off-line or DC-to-DC fixed-frequency current-mode control schemes, with a minimum number of external components. The internally implemented circuits include an under voltage lockout(UVLO), featuring a start-up current of less than 1 mA, and a precision reference trimmed for accuracy at the error amplifier input. Other internal circuits include logic to ensure latched operation, a pulse-width modulation (PWM) comparator that also provides current-limit control, and totem-pole output stage that is designed to source or sink high-peak current. The output stage, suitable for driving N-channel MOSFETs, is low when it is in the off state.
Optimized for off-line and DC-to-DC converters
Low start-up current (< 1 mA)
Automatic feedforward compensation
Pulse-by-pulse current limiting
Enhanced load-response characteristics
Under voltage lockout with hysteresis
Double-pulse suppression
High-current totem-pole output
Internally trimmed bandgap reference
Up to 500-kHz operation
Error amplifier with low output resistance
Low start-up current (< 1 mA)
Automatic feedforward compensation
Pulse-by-pulse current limiting
Enhanced load-response characteristics
Under voltage lockout with hysteresis
Double-pulse suppression
High-current totem-pole output
Internally trimmed bandgap reference
Up to 500-kHz operation
Error amplifier with low output resistance
Flyback Controllers, Texas Instruments
Current-Mode and Voltage-Mode PWM Controller
Primary-Side Regulation
Peak Power Mode
Low Power
Primary-Side Regulation
Peak Power Mode
Low Power
Specifications
Attribute | Value |
---|---|
Maximum Switching Frequency | 500 kHz |
Output Current | 1 A |
Control Method | Current |
Number of Outputs | 1 |
Fall Time | 50ns |
Mounting Type | Through Hole |
Package Type | PDIP |
Rise Time | 50ns |
Topology | Boost, Buck, Flyback, Forward |
Pin Count | 8 |
Maximum Duty Cycle | 100% |
Dimensions | 9.81 x 6.35 x 4.57mm |
Length | 9.81mm |
PWM Controller Type | Current Mode |
Width | 6.35mm |
Height | 4.57mm |
Maximum Operating Temperature | +70 °C |
Minimum Operating Temperature | 0 °C |