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UC3702 PDF Datasheet ( 特性, スペック, ピン接続図 )

部品番号 UC3702
部品説明 Quad PWM Relay Driver
メーカ Unitrode
ロゴ Unitrode ロゴ 



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UC3702 Datasheet, UC3702 PDF,ピン配置, 機能
Quad PWM Relay Driver
UC1702
UC2702
UC3702
FEATURES
Maintains Constant Average
Relay Voltage With Varying
Supply Voltages
VBUS Voltages up to 42.5V
Up to 50mA per Relay
Integrated Schottky Flyback Diodes
Individual Relay Control Inputs
Short Circuit Protection
User Selectable Operating Center
Frequency and Relay Voltage
Global Reset
DESCRIPTION
The UC3702 Quad Relay Driver is intended to drive up to four relays from
logic inputs using an unregulated relay voltage supply. The relays are
driven from the Bus supply in a power efficient PWM converter fashion.
The relay coil is used as the inductive element. (See the application's sec-
tion concerning the relay selection.) VBUS must be higher then the rated
relay voltage. Short circuit protection is provided on chip with periodic retry.
The UC3702 requires a +5V logic supply as a reference. Two external re-
sistors program the effective relay voltage and a capacitor sets the nominal
operating frequency. Internal Schottky diodes eliminate the need for any
external power components.
In typical applications, the UC3702 grants the user the flexibility to choose
the most cost effective relay without the added burden of generating a sep-
arate relay supply voltage. The UC3702 will even function with a poorly
regulated supply VBUS, containing significant 100Hz or 120Hz ripple.
BLOCK DIAGRAM
SLUS368 - APRIL 1997
UDG-96009-1

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