圖片僅供參考
| FLYiNG 零件編號 | ICUC3849BGS08RUTC |
| FLYiNG 庫存現貨 | 10 |
| 製造商 | UTC |
| 製造商零件編號 | UC3849BG-S08-R |
| 說明 | LINEAR UC3849BG-S08-R SOP-8 |
| 無鉛狀態 / RoHS 指令狀態 | RoHS / Halogen Free |
| 積體電路 | LOW COST POWER-SAVING MODE PWM CONTROLLER FOR FLYBACK CONVERTERS |
| 原廠料號 | UC3849BG-S08-R |
| 電源電壓Vdd | 9~24V |
| 工作溫度 | -40~125°C |
| 封裝／外殼 | SOP-8 |
| 安裝類型 | SMD 表面黏著式 |
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UC3849B LINEAR INTEGRATED CIRCUIT
LOW COST POWER-SAVING MODE PWM CONTROLLER FOR FLYBACK CONVERTERS
DESCRIPTION
The UC3849B is a high performance current mode PWM controller ideally suited for low standby power. Low VDD startup current make the power reliable on startup design and a large value resistor could be used in the startup circuit to minimize the standby power. At no load condition, the IC operates in power-saving mode for lower standby power, decreasing frequency for Higher conversion efficiency at light load condition.
The UC3849B contains protection with automatic recovery including OLP (over load protection), programming OTP (over temperature protection), OVP (over voltage protection), UVLO (VDD over voltage clamp and under voltage lockout).To protect the power MOSFET, Gate-drive output is fixed up to 16V max. The UC3849B contains protection OCP (cycle-by-cycle current limiting).
The internal slope compensation improves system stability at high PWM duty cycle output. Leading-edge blanking on current sense input removes the signal glitch, which offering minimal external component count in the design. Excellent EMI performance is achieved with UTC proprietary frequency hopping technique (ZL201020615247.1) together with soft driver control. Audio noise is eliminated due to switch frequency more than 20kHz during operation.
The UC3849B has such applications as: battery charger, power adaptor, set-top box power supplies, ink jet printers, open-frame SMPS.
FEATURES
UC3849B 線性集成電路
用於反激式轉換器的低成本省電模式 PWM 控制器
描述
UC3849B 是一款高性能電流模式 PWM 控制器，非常適合低待機功耗。 低 VDD 啟動電流使電源在啟動設計上可靠，並且可以在啟動電路中使用大阻值電阻以最大限度地降低待機功耗。 在無負載條件下，IC 以省電模式運行以降低待機功耗，降低頻率以在輕負載條件下提高轉換效率。
UC3849B 包含自動恢復保護功能，包括 OLP（過載保護）、編程 OTP（過溫保護）、OVP（過壓保護）、UVLO（VDD 過壓箝位和欠壓鎖定）。為了保護功率 MOSFET，Gate- 驅動輸出固定為最大 16V。 UC3849B 包含保護 OCP（逐週期電流限制）。
內部斜率補償提高了高 PWM 佔空比輸出時的系統穩定性。 電流檢測輸入端的前沿消隱消除了信號毛刺，從而最大限度地減少了設計中的外部元件數量。 UTC專有的跳頻技術（ZL201020615247.1）和軟驅動控制實現了出色的EMI性能。 由於工作期間超過 20kHz 的開關頻率，音頻噪聲被消除。
UC3849B 的應用包括：電池充電器、電源適配器、機頂盒電源、噴墨打印機、開架式 SMPS。
特徵
無衝突金屬聲明書
UC3849B LINEAR INTEGRATED CIRCUIT
LOW COST POWER-SAVING MODE PWM CONTROLLER FOR FLYBACK CONVERTERS
DESCRIPTION
The UC3849B is a high performance current mode PWM controller ideally suited for low standby power. Low VDD startup current make the power reliable on startup design and a large value resistor could be used in the startup circuit to minimize the standby power. At no load condition, the IC operates in power-saving mode for lower standby power, decreasing frequency for Higher conversion efficiency at light load condition.
The UC3849B contains protection with automatic recovery including OLP (over load protection), programming OTP (over temperature protection), OVP (over voltage protection), UVLO (VDD over voltage clamp and under voltage lockout).To protect the power MOSFET, Gate-drive output is fixed up to 16V max. The UC3849B contains protection OCP (cycle-by-cycle current limiting).
The internal slope compensation improves system stability at high PWM duty cycle output. Leading-edge blanking on current sense input removes the signal glitch, which offering minimal external component count in the design. Excellent EMI performance is achieved with UTC proprietary frequency hopping technique (ZL201020615247.1) together with soft driver control. Audio noise is eliminated due to switch frequency more than 20kHz during operation.
The UC3849B has such applications as: battery charger, power adaptor, set-top box power supplies, ink jet printers, open-frame SMPS.
FEATURES
- UTC proprietary frequency hopping technology for Improved EMI performance.
- Power-saving mode for high light-load and standby efficiency
- Soft Start
- Dynamic peak current limiting for constant output power
- Built-in synchronized slope compensation
- OLP,OVP and VDD clamp for higher security
- Programming OTP for higher security
- Fixed switch frequency 65kHz
- Gate output voltage clamped at 15V
- Low start-up current
- Cycle-by-cycle Current Limiting
- Under voltage lockout (UVLO)
- Few external components required
UC3849B 線性集成電路
用於反激式轉換器的低成本省電模式 PWM 控制器
描述
UC3849B 是一款高性能電流模式 PWM 控制器，非常適合低待機功耗。 低 VDD 啟動電流使電源在啟動設計上可靠，並且可以在啟動電路中使用大阻值電阻以最大限度地降低待機功耗。 在無負載條件下，IC 以省電模式運行以降低待機功耗，降低頻率以在輕負載條件下提高轉換效率。
UC3849B 包含自動恢復保護功能，包括 OLP（過載保護）、編程 OTP（過溫保護）、OVP（過壓保護）、UVLO（VDD 過壓箝位和欠壓鎖定）。為了保護功率 MOSFET，Gate- 驅動輸出固定為最大 16V。 UC3849B 包含保護 OCP（逐週期電流限制）。
內部斜率補償提高了高 PWM 佔空比輸出時的系統穩定性。 電流檢測輸入端的前沿消隱消除了信號毛刺，從而最大限度地減少了設計中的外部元件數量。 UTC專有的跳頻技術（ZL201020615247.1）和軟驅動控制實現了出色的EMI性能。 由於工作期間超過 20kHz 的開關頻率，音頻噪聲被消除。
UC3849B 的應用包括：電池充電器、電源適配器、機頂盒電源、噴墨打印機、開架式 SMPS。
特徵
- UTC 專有的跳頻技術可改善 EMI 性能。
- 高輕載和待機效率的省電模式
- 慢啟動
- 用於恆定輸出功率的動態峰值電流限制
- 內置同步斜率補償
- OLP、OVP 和 VDD 箝位以實現更高的安全性
- 編程 OTP 以獲得更高的安全性
- 固定開關頻率 65kHz
- 柵極輸出電壓箝位在 15V
- 低啟動電流
- 逐週期電流限制
- 欠壓鎖定 (UVLO)
- 需要很少的外部元件
