ZDS1009

ZDS1009 SM-8 COMPLEMENTARY CURRENT MIRROR DESCRIPTION The ZDS1009 current mirror has been developed specifically for high side, current sense plus level translation applications and as such will find a broad a p p li c ati ons bas e i nc l udi ng ba t t e ry ch a rg e management, DC motor control and over current monitoring functions. It is of particular interest for current sense applications for feedback purposes in fast battery chargers for Li-Ion cell based systems. The device functions by sensing the voltage developed across an external (user defined) high side current sense resistor, and by an arrangement of current mirrors refer this sensed voltage, with or without multiplication, to a low side referenced signal. This signal can then be used, for example, to close the control loop to a controller IC, for a DC-DC converter providing charge to a battery. FEATURES Excellent Temperature Tracking Characteristics Compact Cost Effective Solution Simplifies Circuit Implementation Broad application base from Single Cell Li-ion High Side Current sense chargers to Multi-cell Lead-Acid systems Only 4 Connections required SM-8 (8 LEAD SOT223) SCHEMATIC DIAGRAM TYPICAL APPLICATION CIRCUIT R Vsense = IR2 4 R1 For balance R3=R4 eg R2=100mΩ R1=R3=R4=100Ω Vsense sensitivity = 100mV/A CONNECTION DIAGRAM ISSUE 2 - JANUARY 2000 1 ZDS1009 ABSOLUTE MAXIMUM RATINGS. PARAMETER Maximum Operating Voltage Maximum Voltage (E1-E2,E3-E4) Peak Pulse Current Continuous Current (...