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UC3845D
Single ended 500KHz current mode PWM controller with 8.4V/7.6V UVLO 50% duty cycle, 0C to 70C
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Manufacturer:
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Mfr.Part #:
UC3845D
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Datasheet:
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Output Type:
Transistor Driver
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Function:
Step-Up, Step-Down, Step-Up/Step-Down
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Output Configuration:
Positive, Isolation Capable
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Topology:
Boost, Buck, Buck-Boost, Flyback, Forward
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EDA/CAD Models:
Availability: 3477 PCS
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UC3845D General Description
The UCx84x 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 undervoltage 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 a 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.
The UCx84x family offers a variety of package options, temperature range options, choice of maximum duty cycle, and choice of turnon and turnoff thresholds and hysteresis ranges. Devices with higher turnon or turnoff hysteresis are ideal choices for off-line power supplies, while the devices with a narrower hysteresis range are suited for DC-DC applications. The UC184x devices are specified for operation from –55°C to 125°C, the UC284x series is specified for operation from –40°C to 85°C, and the UC384x series is specified for operation from 0°C to 70°C.
Key Features
- 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
- Undervoltage 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
Specifications
Category | Integrated Circuits (ICs)Power Management (PMIC)DC DC Switching Controllers | Series | - |
Output Type | Transistor Driver | Function | Step-Up, Step-Down, Step-Up/Step-Down |
Output Configuration | Positive, Isolation Capable | Topology | Boost, Buck, Buck-Boost, Flyback, Forward |
Number of Outputs | 1 | Output Phases | 1 |
Voltage - Supply (Vcc/Vdd) | 12V ~ 28V | Frequency - Switching | Up to 500kHz |
Duty Cycle (Max) | 48% | Synchronous Rectifier | No |
Clock Sync | No | Serial Interfaces | - |
Control Features | Frequency Control | Operating Temperature | 0°C ~ 70°C (TA) |
Mounting Type | Surface Mount | Base Product Number | UC3845 |
Product Category | Switching Controllers | Output Voltage | 4.9 V to 5.1 V |
Output Current | 1 A | Minimum Operating Temperature | 0 C |
Maximum Operating Temperature | + 70 C | Mounting Style | SMD/SMT |
Operating Supply Voltage | 30 V | Product Type | Switching Controllers |
Factory Pack Quantity | 55 | Subcategory | PMIC - Power Management ICs |
Type | Current Mode PWM Controllers | Unit Weight | 0.011923 oz |
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Availability: 3477 PCS
+BOMQty. | Unit Price | Ext. Price |
---|---|---|
1+ | $1.347 | $1.35 |
10+ | $1.196 | $11.96 |
30+ | $1.088 | $32.64 |
100+ | $0.989 | $98.90 |
500+ | $0.945 | $472.50 |
1000+ | $0.926 | $926.00 |
The prices below are for reference only.
All bill of materials (BOM) can be sent via email to [email protected], or fill below form to Quote for UC3845D, guaranteed quotes back within 12hr.
Received all in full, as the seller-100 pieces. plus two pieces bonus. the seller recommend.