TSM108IDT STMicroelectronics, TSM108IDT Datasheet
TSM108IDT
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TSM108IDT Summary of contents
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VOLTAGE AND CURRENT STEPDOWN PWM CONTROLLER OUTPUT HIGH SIDE CURRENT SENSING PRECISE CC/CV REGULATION ADJUSTABLE SWITCHING FREQUENCY ADJUSTABLE OVP/UVP UVLO THRESHOLDS STANDBY MODE FEATURE SUSTAINS 60V MINIMAL EXTERNAL COMPONENTS COUNT DRIVES EXTERNAL P-CHANNEL MOSFET OR PNP BIPOLAR TRANSISTORS DESCRIPTION TSM108 ...
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TSM108 PIN DESCRIPTION Name Pin VCC 1 Supply voltage of both the signal part and the gate drive !STBY 2 Standby Command; when Low, the device goes in standby GND 3 Ground. Current return for both the gate drive and ...
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ELECTRICAL CHARACTERISTICS T = 25° 12V (unless otherwise specified) amb CC Symbol Parameter CURRENT CONSUMPTION I Current Consumption CC STANDBY I Current Consumption in Standby Mode stby V Input Standby Voltage High Impedance sh V Input Standby Voltage ...
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TSM108 DETAILED INTERNAL SCHEMATIC 4/13 ...
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OSCILLATOR FREQUENCY VERSUS TIMING CAPACITOR TSM108 AS A STAND ALONE DC/DC CONVERTER FOR CIGARETTE LIGHTER ACCESSORIES TSM108 5/13 ...
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PRINCIPLE OF OPERATION AND APPLICATION HINTS Description of a DC/DC step down battery charger 1. Voltage and Current Controller The device has been designed to drive an external P-Channel MOSFET in PWM mode and in Step Down topology. Its two ...
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Gate Drive The Gate Drive stage is directly commanded from the PWM output signal. The Gate Drive stage is a totem pole Mosfet stage which bears different On resistances in order to ensure a slower turn ON than turn ...
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TSM108 7. Standby Mode In order to reduce to a minimum the current con- sumption of the TSM108 when in inactive phase, the Standby mode (!Stby pin of TSM108) imposes a complete OFF state of the P-Channel MOSFET, as well ...
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Inductor The minimum inductor value to choose should ap- ply to Lmin = ( where R = Vout / Iout = 9.6W and where D = Vout / Vin = 0.5 Therefore, Lmin = ...
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TSM108 Mosfet: Pchannel Mosfet: Rdson = 100mΩ, Ciss = 1nF. Driver: TSM108 PWM frequency: 100kHz Free wheel diode 0.7V Shunt: Rsense = 330mΩ The efficiency (η regulator is defined as the ratio of the charging power ...
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Measured Performances The few following curves show the measured per- formances of TSM108 used in DC/DC step down 12.1. Voltage and Current Control, Efficiency Performances using a Pchannel MOSFET: CV & CC Regulation - Switching duty cycle vs Iout ...
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TSM108 12.2. Voltage and Current Control, Efficiency Performances using a PNP bipolar transistor Vout & duty cycle versus Iout 0.05 Efficiency & duty cycle versus Iout 80% 70% 60% 50% 40% ...
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