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UC2845BD1 +BOM

Current Mode PWM

Produttore:

ST
ProduttorePart #:

UC2845BD1
Scheda dati:

UC2845BD1 Scheda dati (PDF)
Part Life Cycle Code:

Active
Pin Count:

8
Reach Compliance Code:

compliant
ECCN Code:

EAR99
EDA/CAD Modelli:

Richiedi modelli CAD gratuiti per UC2845BD1

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UC2845BD1 Descrizione generale

The UC284xB family of control ICs provides the necessary features to implement off-line or DC to DC fixed frequency current mode control schemes with a minimal external parts count. Internally implemented circuits include a trimmed oscillator for precise DUTY CYCLE CONTROL under voltage lockout featuring start-up current less than 0.5mA, a precision reference trimmed for accuracy at the error amp input, logic to insure 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, suitable for driving N-Channel MOSFETs, is low in the off-state.Differences between members of this family are the under-voltage lockout thresholds and maximum duty cycle ranges. The UC2842B and UC2844B have UVLO thresholds of 16V (on) and 10V (off), ideally suited off-line applications The corresponding thresholds for the UC2843B and UC2845B are 8.5V and 7.9V. The UC2842B and UC2843B can operate to duty cycles approaching 100%. A range of the zero to < 50 % is obtained by the UC2844B and UC2845B by the addition of an internal toggle flip flop which blanks the output off every other clock cycle.

Caratteristiche principali

LOW START-UP AND OPERATING CURRENT
UNDERVOLTAGE LOCKOUT WITH HYSTERESIS
INTERNALLY TRIMMED REFERENCE WITH UNDERVOLTAGE LOCKOUT
CURRENT LIMITING
TRIMMED OSCILLATOR FOR PRECISE FREQUENCY CONTROL
CURRENT MODE OPERATION TO 500kHz
OSCILLATOR FREQUENCY GUARANTEED AT 250kHz
LATCHING PWM FOR CYCLE-BY-CYCLE
HIGH CURRENT TOTEM POLE OUTPUT
AUTOMATIC FEED FORWARD COMPENSATION

Specifiche

Source Content uid	UC2845BD1	Part Life Cycle Code	Active
Pin Count	8	Reach Compliance Code	compliant
ECCN Code	EAR99	HTS Code	8542.39.00.01
Factory Lead Time	45 Weeks	Analog IC - Other Type	SWITCHING CONTROLLER
Control Mode	CURRENT-MODE	Control Technique	PULSE WIDTH MODULATION
Input Voltage-Max	30 V	Input Voltage-Min	8.2 V
Input Voltage-Nom	15 V	JESD-30 Code	R-PDSO-G8
JESD-609 Code	e3	Length	4.9 mm
Moisture Sensitivity Level	3	Number of Functions	1
Number of Terminals	8	Operating Temperature-Max	85 °C
Operating Temperature-Min	-25 °C	Output Current-Max	1 A
Peak Reflow Temperature (Cel)	260	Qualification Status	Not Qualified
Seated Height-Max	1.75 mm	Surface Mount	YES
Switcher Configuration	SINGLE	Switching Frequency-Max	500 kHz
Technology	BIPOLAR	Temperature Grade	COMMERCIAL EXTENDED
Terminal Finish	Matte Tin (Sn) - annealed	Terminal Form	GULL WING
Terminal Pitch	1.27 mm	Terminal Position	DUAL
Time@Peak Reflow Temperature-Max (s)	30	Width	3.9 mm

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