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The UC284xB 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 UC2842B and UC2844B have UVLO thresholds of 16V (on) and 10V (off), ideally suited off-line applications The corresponding thresholds for the UC2843B and UC2845B are 8.5V and 7.9V. The UC2842B and UC2843B can operate to duty cycles approaching 100%. A range of the zero to < 50 % is obtained by the UC2844B and UC2845B by the addition of an internal toggle flip flop which blanks the output off every other clock cycle.
主要特性
- LOW START-UP AND OPERATING CURRENT
- UNDERVOLTAGE LOCKOUT WITH HYSTERESIS
- INTERNALLY TRIMMED REFERENCE WITH UNDERVOLTAGE LOCKOUT
- CURRENT LIMITING
- TRIMMED OSCILLATOR FOR PRECISE FREQUENCY CONTROL
- CURRENT MODE OPERATION TO 500kHz
- OSCILLATOR FREQUENCY GUARANTEED AT 250kHz
- LATCHING PWM FOR CYCLE-BY-CYCLE
- HIGH CURRENT TOTEM POLE OUTPUT
- AUTOMATIC FEED FORWARD COMPENSATION
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样片和购买
| 产品型号 | 封装 | 包装类型 | 供货状态 | 预算价格(US$) | 数量 | ECCN (US) | Country of Origin | 从分销商订购 | 从ST订购 |
|---|---|---|---|---|---|---|---|---|---|
| UC2842BN | DIP-8 | Tube |
Active
|
0.3312 | 1000 | EAR99 | - | 查看供货情况 | 立即购买 |
| UC2842BD1 | SO-8 | Tube |
Active
|
0.3312 | 1000 | EAR99 | MOROCCO | 查看供货情况 | 立即购买 |
| UC2842BD1013TR | SO-8 | Tape And Reel |
Active
|
0.3312 | 1000 | EAR99 | MOROCCO | 查看供货情况 | 立即购买 |
(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office or our Distributors
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| 产品型号 | 供货状态 | 封装 | 等级规格 | 符合RoHS级别 | 材料声明** |
|---|---|---|---|---|---|
| UC2842BD1 |
Active
|
SO-8 | 工业 | Ecopack2 | |
| UC2842BD1013TR |
Active
|
SO-8 | 工业 | Ecopack2 | |
| UC2842BN |
Active
|
DIP-8 | 工业 | Ecopack2 |
(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.
