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TDA7278STN/a181avaiHIGH-EFFICIENCY CD ACTUATOR DRIVER


TDA7278 ,HIGH-EFFICIENCY CD ACTUATOR DRIVERABSOLUTE MAXIMUM RATINGS (25°C)Pin Name Min Max UnitHIN 1, HIN 2, HIN 3, HIN 4 -0.4 8 VHOUT 1A, HOU ..
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TDA7278
HIGH-EFFICIENCY CD ACTUATOR DRIVER
TDA7278
HIGH-EFFICIENCY CD ACTUATOR DRIVER
WIDE OPERATIVE SUPPLY RANGE (1.6 to
5V) LOW VOLTAGE OPERATION CAPABIL-
ITY
4 LOAD DRIVING VOLTAGES PWM REGU-
LATED (STEP DOWN FROM BATTERY)
LOW ON RESISTANCE H BRIDGES
(2 x 1.6Ω MAX + 2 x 2.5Ω MAX) FOR:
– FOCUS AND TRACKING ACTUATORS
– SLEDGE AND SPINDLE MOTORS
SYNCHRONIZABLE SAWTOOTH OSCILLATOR
CONFIGURABLE DC/DC CONVERTER FOR
ADJUSTABLE MAIN POWER SUPPLY, WITH
LOW ON RESISTANCE (0.4Ω MAX) SWITCH
GENERAL ENABLE INPUT
ADJUSTABLE WATCH DOG AND DELAYED
POWER ON RESET FUNCTIONS
ADJUSTABLE COMPARATORS FOR BAT-
TERY LOW AND BATTERY EMPTY DETEC-
TION
PIN CONNECTION
ABSOLUTE MAXIMUM RATINGS (25°C)
* Pin 1, 8, 12, 14, 20, 26 and 33 are ESD sensitive (max. voltage ±1KV)
THERMAL DATA
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PIN FUNCTIONS
TDA7278
ELECTRICAL CHARACTERISTICS (Tamb = 25°C, VBAT = 1.6V unless otherwise specified)
(1): all the 4 PWM outputs switched off.
(2) TRESET = width of the Reset pulse on pin 19 = K ⋅ C, where C is the capacitance on pin 20 (CRES).
To avoid reset, the frequency of watch dog pulses must be greater than (3 ⋅ TRESET)-1
(3) All the 4 PWM output switched OFF, auxiliary and main DC/DC converters polarized but not switching
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Figure 1: Block Diagram.
TDA7278
Figure 2: Test Circuit
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Figure 3: DC – DC Converter Configuration.
TDA7278
Figure 4: DC – DC Converter: Feedback and Compensation Networks.
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