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LM5032 Datasheet(PDF) 3 Page - National Semiconductor (TI) |
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LM5032 Datasheet(HTML) 3 Page - National Semiconductor (TI) |
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3 / 22 page  Pin Description (Continued) PIN NAME DESCRIPTION APPLICATIONS INFORMATION 8 GND1 Ground, Controller 1 Ground connection for Controller 1 including gate driver, PWM controller, soft-start and support functions. 9 GND2 Ground, Controller 2 Ground connection for Controller 2 including the gate driver, PWM controller and soft-start. 10 OUT2 Main Gate Driver, Controller 2 Gate driver output to the primary side switch for Controller 2. OUT2 swings between VCC and GND2 at a frequency equal to half the oscillator frequency. 11 RES Hiccup mode restart adjust An external capacitor sets the time delay before forced restart during a sustained period of cycle-by-cycle current limiting. The hiccup mode comparator threshold is 2.55V. 12 SS2 Soft-start, Controller 2 An internal 50 µA current source charges an external capacitor to set the soft-start rate. During a current limit restart sequence, the internal current source is reduced to 1µA to increase the delay before retry. Forcing SS2 below 0.5V shuts off Controller 2. 13 CS2 Current Sense Input, Controller 2 Input for current mode control and the current limit sensing. If the CS2 pin exceeds 0.5V the OUT2 pulse is terminated producing cycle-by-cycle current limiting. External resistance connected to CS2 will adjust (increase) PWM slope compensation. This pin’s voltage must not exceed 1.25V. 14 COMP2 PWM Control, Controller 2 The COMP2 input provides voltage feedback to the PWM comparator inverting input of Controller 2 through a 3:1 divider. The OUT2 duty cycle increases as the COMP2 voltage increases. An internal 5k Ω pull-up resistor to +5.0V provides bias current to the opto-coupler transistor. 15 DCL Duty Cycle Limit An external resistor sets the maximum allowed duty cycle at OUT1 and OUT2. 16 RT/SYNC Oscillator Adjust and Synchronizing input An external resistor sets the oscillator frequency. This pin also accepts ac-coupled synchronization pulses from an external source. www.national.com 3 |
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