UC2825

AKTIV

Verbesserter zweiseitiger 30V/1,5A-PWM-Controller mit 1 MHz mit 9,2V/8,4V UVLO, 80 % Tastverhältnis,

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Datenblatt

document-pdfAcrobat High Speed PWM Controller datasheet (Rev. A) (Englisch)

UC2825

AKTIV

Datenblatt

Jetzt bestellen

Produktdetails

Vin (max) (V)

12

Operating temperature range (°C)

-40 to 85

Control mode

Current, Feedforward

Topology

Boost, Flyback, Forward, Full bridge, Half bridge, Push pull

Rating

Catalog

Duty cycle (max) (%)

80

Vin (max) (V)

12

Operating temperature range (°C)

-40 to 85

Control mode

Current, Feedforward

Topology

Boost, Flyback, Forward, Full bridge, Half bridge, Push pull

Rating

Catalog

Duty cycle (max) (%)

80

PDIP (N)

16

181.42 mm² 19.3 x 9.4

SOIC (DW)

16

106.09 mm² 10.3 x 10.3

Compatible with Voltage or Current Mode Topologies
Practical Operation Switching Frequencies to 1MHz
50ns Propagation Delay to Output
High Current Dual Totem Pole Outputs (1.5A Peak)
Wide Bandwidth Error Amplifier
Fully Latched Logic with Double Pulse Suppression
Pulse-by-Pulse Current Limiting
Soft Start / Max. Duty Cycle Control
Under-Voltage Lockout with Hysteresis
Low Start Up Current (1.1mA)

Compatible with Voltage or Current Mode Topologies
Practical Operation Switching Frequencies to 1MHz
50ns Propagation Delay to Output
High Current Dual Totem Pole Outputs (1.5A Peak)
Wide Bandwidth Error Amplifier
Fully Latched Logic with Double Pulse Suppression
Pulse-by-Pulse Current Limiting
Soft Start / Max. Duty Cycle Control
Under-Voltage Lockout with Hysteresis
Low Start Up Current (1.1mA)

The UC1825 family of PWM control ICs is optimized for high frequency switched mode power supply applications. Particular care was given to minimizing propagation delays through the comparators and logic circuitry while maximizing bandwidth and slew rate of the error amplifier. This controller is designed for use in either current-mode or voltage mode systems with the capability for input voltage feed-forward.

Protection circuitry includes a current limit comparator with a 1V threshold, a TTL compatible shutdown port, and a soft start pin which will double as a maximum duty cycle clamp. The logic is fully latched to provide jitter free operation and prohibit multiple pulses at an output. An under-voltage lockout section with 800mV of hysteresis assures low start up current. During under-voltage lockout, the outputs are high impedance.

These devices feature totem pole outputs designed to source and sink high peak currents from capacitive loads, such as the gate of a power MOSFET. The on state is designed as a high level.

The UC1825 family of PWM control ICs is optimized for high frequency switched mode power supply applications. Particular care was given to minimizing propagation delays through the comparators and logic circuitry while maximizing bandwidth and slew rate of the error amplifier. This controller is designed for use in either current-mode or voltage mode systems with the capability for input voltage feed-forward.

Protection circuitry includes a current limit comparator with a 1V threshold, a TTL compatible shutdown port, and a soft start pin which will double as a maximum duty cycle clamp. The logic is fully latched to provide jitter free operation and prohibit multiple pulses at an output. An under-voltage lockout section with 800mV of hysteresis assures low start up current. During under-voltage lockout, the outputs are high impedance.

These devices feature totem pole outputs designed to source and sink high peak currents from capacitive loads, such as the gate of a power MOSFET. The on state is designed as a high level.

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Alle anzeigen 3

	Typ	Titel	Datum
*	Data sheet	High Speed PWM Controller datasheet (Rev. A)	24 Feb 2004
	Application note	Qualifier TJ = TA Defined	03 Nov 2010
	Application note	U-110 1.5 Mhz Current Mode IC Controlled 50-Watt Power Supply	05 Sep 1999

Design und Entwicklung

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