The UC1825 family of PWM control ICs is optimized for high frequency switched mode power supply applications. Particular care was given to minimizing propagation delays through the comparators and logic circuitry while maximizing bandwidth and slew rate of the error amplifier. This controller is designed for use in either current-mode or voltage mode systems with the capability for input voltage feed-forward.
Protection circuitry includes a current limit comparator with a 1V threshold, a TTL compatible shutdown port, and a soft start pin which will double as a maximum duty cycle clamp. The logic is fully latched to provide jitter free operation and prohibit multiple pulses at an output. An under-voltage lockout section with 800mV of hysteresis assures low start up current.
| UC1825 | UC2825 | UC3825 | |
| Topology | Boost, Flyback, Forward, Full-Bridge, Half-Bridge, Push-Pull | Boost, Flyback, Forward, Full-Bridge, Half-Bridge, Push-Pull | Boost, Buck, Flyback, Forward, Full-Bridge, Half-Bridge, Push-Pull |
| Control Method | Current Mode | Current Mode | Current Mode, Voltage Mode |
| Duty Cycle(Max)(%) | 50 | 50 | 50 |
| Frequency(Max)(kHz) | 1000 | 1000 | 1000 |
| UVLO Thresholds On/Off(V) | 9.2/8.4 | 9.2/8.4 | 9.2/8.4 |
| Pin/Package | 16CDIP, 16CFP, 20LCCC | 16PDIP, 16SOIC, 20PLCC | 16PDIP, 20PLCC, 16SOIC |
| Regulated Outputs(#) | 2 | 2 | 2 |
| Operating Temperature Range(°C) | -55 to 125 | -40 to 85 | 0 to 70 |
| Rating | Military | Catalog | Catalog |
| 器件 | 状态 | 温度 (oC) | 价格（美元） | 封装 | 引脚 | 封装数量 | 封装载体 | 丝印标记 |
| UC3825DW | ACTIVE | 0 to 70 | 1.75 | 1ku | SOIC (DW) | 16 | 40 | TUBE | UC3825DW |
| UC3825DWG4 | ACTIVE | 0 to 70 | 1.75 | 1ku | SOIC (DW) | 16 | 40 | TUBE | UC3825DW |
| UC3825DWTR | ACTIVE | 0 to 70 | 1.70 | 1ku | SOIC (DW) | 16 | 2000 | LARGE T&R | UC3825DW |
| UC3825DWTRG4 | ACTIVE | 0 to 70 | 1.70 | 1ku | SOIC (DW) | 16 | 2000 | LARGE T&R | UC3825DW |
| UC3825N | ACTIVE | 0 to 70 | 1.75 | 1ku | PDIP (N) | 16 | 25 | TUBE | UC3825N |
| UC3825NG4 | ACTIVE | 0 to 70 | 1.75 | 1ku | PDIP (N) | 16 | 25 | TUBE | UC3825N |
| UC3825Q | ACTIVE | 0 to 70 | 1.75 | 1ku | PLCC (FN) | 20 | 46 | TUBE | UC3825Q |
| UC3825QG3 | ACTIVE | 0 to 70 | 1.75 | 1ku | PLCC (FN) | 20 | 46 | TUBE | UC3825Q |
| UC3825QTR | ACTIVE | 0 to 70 | 1.70 | 1ku | PLCC (FN) | 20 | 1000 | LARGE T&R | UC3825Q |
| UC3825QTRG3 | ACTIVE | 0 to 70 | 1.70 | 1ku | PLCC (FN) | 20 | 1000 | LARGE T&R | UC3825Q |
| 器件 | 环保计划* | 铅/焊球涂层 | MSL 等级/回流焊峰 | 环保信息与无铅 (Pb-free) | DPPM / MTBF / FIT 率 |
| UC3825DW | Green (RoHS & no Sb/Br) | CU NIPDAU | Level-2-260C-1 YEAR | UC3825DW | |
| UC3825DWG4 | Green (RoHS & no Sb/Br) | CU NIPDAU | Level-2-260C-1 YEAR | UC3825DWG4 | UC3825DWG4 |
| UC3825DWTR | Green (RoHS & no Sb/Br) | CU NIPDAU | Level-2-260C-1 YEAR | UC3825DWTR | |
| UC3825DWTRG4 | Green (RoHS & no Sb/Br) | CU NIPDAU | Level-2-260C-1 YEAR | UC3825DWTRG4 | UC3825DWTRG4 |
| UC3825N | Green (RoHS & no Sb/Br) | CU NIPDAU | N/A for Pkg Type | UC3825N | |
| UC3825NG4 | Green (RoHS & no Sb/Br) | CU NIPDAU | N/A for Pkg Type | UC3825NG4 | UC3825NG4 |
| UC3825Q | Green (RoHS & no Sb/Br) | CU SN | Level-2-260C-1 YEAR | UC3825Q | |
| UC3825QG3 | Green (RoHS & no Sb/Br) | CU SN | Level-2-260C-1 YEAR | UC3825QG3 | |
| UC3825QTR | Green (RoHS & no Sb/Br) | CU SN | Level-2-260C-1 YEAR | UC3825QTR | |
| UC3825QTRG3 | Green (RoHS & no Sb/Br) | CU SN | Level-2-260C-1 YEAR | UC3825QTRG3 |
| 名称 | 型号 | 公司 | 工具/软件类型 |
| 音频的快速搜索选择工具 | AUDIO_SELECTION_TOOL | Texas Instruments | 免费评估工具 |
| UC3825 评估模块 | UC3825EVM | Texas Instruments | 开发电路板/EVM |
| 用于音频转换器的软件驱动程序 | CODECDRIVERS-SW | Texas Instruments | 应用软件 |