Datasheet > UC2879L

UC2879L

更新时间： 2024-11-01 23:38:55

品牌	Logo	应用领域
其他 - ETC		开关控制器
页数	文件大小	规格书
7页	373K
描述
Current/Voltage-Mode SMPS Controller

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UC2879L 数据手册

UC1879

UC2879

UC3879

Phase Shift Resonant Controller

FEATURES

DESCRIPTION

• Programmable Output Turn On

Delay; Zero Delay Available

The UC3879 controls a bridge power stage by phase shifting the switching

of one half-bridge with respect to the other. This allows constant frequency

pulse width modulation in combination with resonant, zero-voltage switching

for high efficiency performance. The UC3879 can be configured to provide

control in either voltage mode or current mode operation, with overcurrent

shutdown for fast fault protection.

• Compatible with Voltage Mode or

Current Mode Topologies

• Practical Operation at Switching

Frequencies to 300kHz

Independently programmable time delays provide dead-time at the turn-on

of each output stage, allowing time for each resonant switching interval.

• Four 100mA Totem Pole Outputs

• 10MHz Error Amplifier

With the oscillator capable of operating in excess of 600kHz, overall output

switching frequencies to 300kHz are practical. In addition to the standard

free running mode, with the CLKSYNC pin, the user may configure the

UC3879 to accept an external clock synchronization signal. Alternatively, up

to three units can be locked together with the operational frequency deter-

mined by the fastest device.

• Pin Programmable Undervoltage

Lockout

• Low Startup Current - 150µA

• Soft Start Control

Protective features include an undervoltage lockout and overcurrent protec-

tion. Additional features include a 10MHz error amplifier, a 5V precision ref-

erence, and soft start. The UC3879 is available in 20 pin N, J, DW, and Q

and 28 pin L packages.

• Outputs Active Low During UVLO

BLOCK DIAGRAM

UDG-94070-1

6/98

12 3 4 5 6 7

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