ZDS1009 Datasheet, PDF (1/5 Pages) Zetex Semiconductors – COMPLEMENTARY CURRENT MIRROR

SM-8 COMPLEMENTARY CURRENT MIRROR
ZDS1009
DESCRIPTION
The ZDS1009 current mirror has been developed The device functions by sensing the voltage developed
specifically for high side, current sense plus level across an external (user defined) high side current
translation applications and as such will find a broad sense resistor, and by an arrangement of current
applications base including battery charge mirrors refer this sensed voltage, with or without
management, DC motor control and over current multiplication, to a low side referenced signal. This
monitoring functions. It is of particular interest for signal can then be used, for example, to close the
current sense applications for feedback purposes in fast control loop to a controller IC, for a DC-DC converter
battery chargers for Li-Ion cell based systems.
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
V=
sense
IR ⁴
2_R
1
For balance R3=R4
eg
R2=100mΩ
R1=R3=R4=100Ω
Vsense sensitivity = 100mV/A
CONNECTION DIAGRAM
ISSUE 2 - JANUARY 2000
1