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UC3846N Current Mode PWM Controller IC 40V 500mA DIP-16
UC3846N – Current Mode PWM Controller, 40V, 500mA Peak Output, 500kHz, 5.1V ±1% Ref, UVLO, Soft-Start, Shutdown, 16-Pin PDIP (DIP-16). 0°C to +70°C.
35.00 EGP
Buy NowUC3846N Current Mode PWM Controller IC 40V 500mA DIP-16
The UC3846N is a member of UCx846/7 family of current-mode PWM control devices, packaged in a 16-pin PDIP (through-hole) package. It provides all of the necessary features to implement off-line or DC-to-DC fixed-frequency, current-mode control schemes while maintaining a minimum external parts count.
Internally implemented circuits include an undervoltage lockout featuring start-up current less than 1 mA, a precision reference trimmed for accuracy at the error amplifier input, logic to ensure 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 is suitable for driving either N-channel MOSFETs or bipolar transistor switches and is low in the OFF state.
Features
- Automatic feedforward compensation
- Programmable pulse-by-pulse current limiting
- Automatic symmetry correction in push-pull configuration
- Enhanced load response characteristics
- Parallel operation capability for modular power systems
- Differential current sense amplifier with wide common-mode range
- Double-pulse suppression
- 500-mA (peak) totem-pole outputs
- ±1% bandgap reference
- Undervoltage lockout
- Soft-start capability
- Shutdown terminal (complete shutdown with auto-restart or latched shutdown)
- 500-kHz operation
- Outputs LOW in the OFF state (suitable for driving N-channel MOSFETs or bipolar transistor switches)
- Start-up current less than 1 mA
Specifications
| Specification | Value |
|---|---|
| Product Information | |
| Part Number | UC3846N |
| Manufacturer | Texas Instruments (TI) |
| Product Family | UCx846/7 Current Mode PWM Controller |
| Package | PDIP (N) – 16 Pins, Through Hole |
| Body Size (Nominal) | 6.35 mm × 19.3 mm |
| Operating Temperature Range | 0°C to +70°C |
| RoHS Compliant | Yes (Lead Finish: NIPDAU) |
| Shipping Packaging | Tube, 25 pcs |
| Product Status | NRND (Not Recommended for New Designs) |
| Absolute Maximum Ratings | |
| Supply Voltage (VIN, Pin 15) | 40 V |
| Collector Supply Voltage (VC, Pin 13) | 40 V |
| Output Current, Source or Sink (Pins 11, 14) | 500 mA |
| Analog Inputs (Pins 3, 4, 5, 6, 16) | –0.3 V to +VIN |
| Reference Output Current (Pin 2) | –30 mA |
| Sync Output Current (Pin 10) | –5 mA |
| Error Amplifier Output Current (Pin 7) | –5 mA |
| Soft Start Sink Current (Pin 1) | 50 mA |
| Oscillator Charging Current (Pin 9) | 5 mA |
| Power Dissipation @ TA = 25°C | 1000 mW |
| Power Dissipation @ TC = 25°C | 2000 mW |
| Storage Temperature | –65°C to +150°C |
| Reference (VREF) | |
| Output Voltage (TJ = 25°C, IO = 1 mA) | 5.10 V typ (5.00 V to 5.20 V) |
| Line Regulation (VIN = 8 V to 40 V) | 5 mV typ / 20 mV max |
| Load Regulation (IL = 1 mA to 10 mA) | 3 mV typ / 15 mV max |
| Total Output Variation (Line, Load, Temp.) | 4.95 V to 5.25 V |
| Short Circuit Output Current | –10 mA to –45 mA |
| Oscillator | |
| Initial Accuracy (TJ = 25°C) | 43 kHz typ (39 kHz to 47 kHz) |
| Voltage Stability (VIN = 8 V to 40 V) | –1% to 2% |
| Temperature Stability | –1% |
| Maximum Operation | 500-kHz operation (waveform clarity in excess of 1 MHz) |
| Error Amplifier | |
| Input Offset Voltage | 0.5 mV typ / 10 mV max |
| Input Bias Current | –0.6 µA typ / –2 µA max |
| Common Mode Range | 0 V to (VIN – 2 V) |
| Open Loop Voltage Gain | 105 dB typ / 80 dB min |
| Unity Gain Bandwidth | 1.0 MHz typ / 0.7 MHz min |
| CMRR (VCM = 0 V to 38 V) | 100 dB typ / 75 dB min |
| PSRR (VIN = 8 V to 40 V) | 105 dB typ / 80 dB min |
| Current Sense Amplifier | |
| Amplifier Gain | 2.75 V typ (2.5 V to 3.0 V) |
| Maximum Differential Input Signal | 1.2 V max |
| Input Common Mode Range | 0 V to (VIN – 3 V) |
| Input Offset Voltage | 5 mV typ / 25 mV max |
| Delay to Outputs | 200 ns typ / 500 ns max |
| Current Limit Adjust & Shutdown | |
| Current Limit Offset | 0.5 V typ (0.45 V to 0.55 V) |
| Shutdown Threshold Voltage | 350 mV typ (250 mV to 400 mV) |
| Shutdown Input Voltage Range | 0 V to VIN |
| Shutdown Delay to Outputs | 300 ns typ / 600 ns max |
| Output Stage | |
| Collector-Emitter Voltage | 40 V |
| Output Low Level (ISINK = 100 mA) | 0.4 V typ / 2.1 V max |
| Output High Level (ISOURCE = 100 mA) | 12 V min / 13.5 V max |
| Rise Time (CL = 1 nF) | 50 ns typ / 300 ns max |
| Fall Time (CL = 1 nF) | 50 ns typ / 300 ns max |
| Undervoltage Lockout (UVLO) & Supply | |
| Start-Up Threshold | 8.0 V typ (7.7 V min) |
| Threshold Hysteresis | 0.75 V |
| Total Standby Supply Current | 17 mA typ / 21 mA max |
| ESD & Thermal Ratings | |
| ESD – Human Body Model (HBM) | ±2500 V |
| ESD – Charged Device Model (CDM) | ±1500 V |
| RθJA (Junction-to-Ambient) | 41.8 °C/W |
| RθJC(top) (Junction-to-Case) | 28.5 °C/W |
| RθJB (Junction-to-Board) | 21.8 °C/W |
Applications
- Telecommunication power converters
- Industrial power converters
- Off-line and DC-to-DC fixed-frequency, current-mode power supplies
- Parallel / modular power systems with equal current sharing
Package Content
- 1 x UC3846N Current Mode PWM Controller IC 40V 500mA DIP-16
DataSheet
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