Features: · Two Complete PWM Control Circuits
· Outputs Drive MOSFETs Directly
· Oscillator Frequency . . . 50 kHz to 2 MHz
· 3.6-V to 20-V Supply-Voltage Range
· Low Supply Current . . . 3.5 mA Typ
· Adjustable Dead-Time Control, 0% to 100%
· 1.26-V ReferencePinout
SpecificationsSupply voltage, VCC (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . 23 V
Error amplifier input voltage: IN1+, IN1, IN2+, IN2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 V
Output voltage: OUT1, OUT2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . 20 V
Continuous output current: OUT1, OUT2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±200 mA
Peak output current: OUT1, OUT2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 A
Continuous total dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Dissipation Rating Table
Operating free-air temperature range, TA: C suffix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 to 85
Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .65 to 150
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . 260
† Stresses beyond those listed under "absolute maximum ratings" may cause perm anent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended perating conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTE 1: All voltage values are with respect to network GND.
DescriptionThe TL1454A is a dual-channel pulse-width-modulation (PWM) control circuit, primarily intended for low-power, dc/dc converters. Applications include LCD displays, backlight inverters, notebook computers, and other products requiring small, high-frequency, dc/dc converters.
Each PWM channel has its own error amplifier, PWM comparator, dead-time control comparator, and MOSFET driver. The voltage reference, oscillator, undervoltage lockout, and short-circuit protection are common to both hannels.
Channel 1 is configured to drive n-channel MOSFETs in step-up or flyback converters, and channel 2 is configured to drive p-channel MOSFETs in step-down or inverting converters. The operating frequency is set with an external resistor and an external capacitor, and dead time is continuously adjustable from 0 to 100% duty cycle with a resistive divider network. Soft start can be implemented by adding a capacitor to the dead-time control (DTC) network. The error-amplifier common-mode input range includes ground, which allows the TL1454A to be used in ground-sensing battery chargers as well as voltage converters.
TL1454A Data Sheet
