UC1844J
Current Mode PWM Controller 200mA 500kHz 8-Pin CDIP Tube
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Part Number : UC1844J
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Package/Case : CDIP
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Brands : TI
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Components Categories : Switching Regulator or Controllers
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Datesheet : UC1844J DataSheet (PDF)
Overview of UC1844J
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
The followings are basic parameters of the part selected concerning the characteristics of the part and categories it belongs to.
Source Content uid | UC1844J | Pbfree Code | Yes |
Rohs Code | No | Part Life Cycle Code | Active |
Ihs Manufacturer | TEXAS INSTRUMENTS INC | Part Package Code | DIP |
Package Description | DIP, DIP8,.3 | Pin Count | 8 |
Reach Compliance Code | not_compliant | ECCN Code | EAR99 |
HTS Code | 8542.39.00.01 | Samacsys Manufacturer | Texas Instruments |
Analog IC - Other Type | SWITCHING CONTROLLER | Control Mode | CURRENT-MODE |
Control Technique | PULSE WIDTH MODULATION | Input Voltage-Max | 30 V |
Input Voltage-Min | 11 V | Input Voltage-Nom | 15 V |
JESD-30 Code | R-GDIP-T8 | JESD-609 Code | e0 |
Length | 9.58 mm | Number of Functions | 1 |
Number of Terminals | 8 | Operating Temperature-Max | 125 °C |
Operating Temperature-Min | -55 °C | Output Current-Max | 1 A |
Output Voltage-Nom | 5 V | Package Body Material | CERAMIC, GLASS-SEALED |
Package Code | DIP | Package Equivalence Code | DIP8,.3 |
Package Shape | RECTANGULAR | Package Style | IN-LINE |
Peak Reflow Temperature (Cel) | NOT SPECIFIED | Qualification Status | Not Qualified |
Seated Height-Max | 5.08 mm | Supply Current-Max (Isup) | 25 mA |
Supply Voltage-Max (Vsup) | 30 V | Supply Voltage-Min (Vsup) | 12 V |
Surface Mount | NO | Switcher Configuration | BUCK-BOOST |
Switching Frequency-Max | 500 kHz | Technology | BICMOS |
Temperature Grade | MILITARY | Terminal Finish | Tin/Lead (Sn/Pb) |
Terminal Form | THROUGH-HOLE | Terminal Pitch | 2.54 mm |
Terminal Position | DUAL | Time@Peak Reflow Temperature-Max (s) | NOT SPECIFIED |
Width | 7.62 mm |
Warranty & Returns
Warranty, Returns, and Additional Information
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QA & Return Policy
Parts Quality Guarantee: 365 days
Returns for refund: within 90 days
Returns for Exchange: within 90 days
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