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LM3101 Folha de dados(PDF) 4 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Nome de Peças LM3101
Descrição Electrónicos  Secondary-Side PWM Controller
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Fabricante Electrônico  NSC [National Semiconductor (TI)]
Página de início  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM3101 Folha de dados(HTML) 4 Page - National Semiconductor (TI)

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Note 1
Absolute Maximum Ratings indicate limits beyond which damage to the device may occur Operating Ratings indicate conditions for which the device is
intended to be functional but do not guarantee specific performance limits For guaranteed specifications and test conditions see the Electrical Characteristics
Note 2
The reference voltage is measured at the error amplifier’s output with the error amplifier connected as a non-inverting amplifier with a gain of one
Note 3
The temperature coefficients of VREF or FO are defined as the worst-case DVREF or DFO measured at Specified Temperatures divided by the total span of
the Specified Temperture Range (see graphs) There is no guarantee that the Specified Temperatures are exactly at the minimum of maximum deviation
Note 4
The frequency of the internal oscillator is set by connecting a resistor RT from pin 1 to ground See detailed description of this feature in the Pin-by-Pin
Description section or the Functional Description of this datasheet
Note 5
A resistor RSC is connected from pin 5 to the regulator’s output See detailed description of this feature in the Pin-by-Pin Description section or the
Functional Description section of this datasheet
Note 6
For this test the frequency of synchronization FSYNC is 600 kHz CSYNC is 220 pF and RSYNC is1kX The internal oscillator will synchronize to an AC
signal that is 11 to 15 times the free running oscillator frequency FO See Functional Description section or Pin-by-Pin Description section for more detail on
synchronization
Note 7
ICOMP is sourced from pin 6 (CMI) See Functional Description section or Pin-by-Pin Description section for more detail on current mode operation
Note 8
Minimum duty cycle is the smallest duty cycle that can be produced by the LM3101 in a given oscillator period The controller can operate with effectively
zero duty cycleit skips cycles if the regulation cannot be maintained with the minimum duty cycle This means that the output voltage of the switching converter is
regulated down to no load
Note 9
The current sense time delay is the time span between an input applied to the CMI pin (pin 6) and the change of state of VOUT (pin 8) due to the input
Note 10
Both these specifications %VTHC and %VTHP are relative to the nominal feedback voltage VFB by the factor (VTH–VFB)VFB
Note 11
An internal delay circuit prevents triggering of the overvoltage crowbar circuit for pulse widths less than 400 ns to ensure noise immunity
Note 12
This is the minimum supply voltage for which the power-on reset flag will continue to be valid (low)
Note 13
For VS k VUV the output is offit is in a high-impedance state
Note 14
A resistorcapacitor circuit is normally connected from the soft start circuit pin 3 to ground The circuit provides a slow or ‘‘soft’’ start of the IC by slowly
ramping the reference voltage from a lower initial value set by the resistor to its normal operating value See detailed description of this feature in the Pin-by-Pin
Description section or the Functional Description section of this datasheet
Connection Diagram and Ordering Information
14-Lead Package
Top View
TLH11436 – 2
For Surface Mount Package
Order Number LM3101M
See NS Package Number M14B
For DIP Package
Order Number LM3101N
See NS Package Number N14A
4


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