LM5033SD-EVAL National Semiconductor, LM5033SD-EVAL Datasheet - Page 4

• Manufacturer Part Number: LM5033SD-EVAL
• Description: BOARD EVALUATION LM5033SD
• Manufacturer: National Semiconductor
• Series: PowerWise®r

Specifications of LM5033SD-EVAL

• Main Purpose: DC/DC, Step Down
• Outputs And Type: 1, Non-Isolated
• Voltage - Output: 9V
• Current - Output: 20A
• Voltage - Input: 40 ~ 60V
• Regulator Topology: Buck
• Frequency - Switching: 315kHz
• Board Type: Fully Populated
• Utilized Ic / Part: LM5033
• Lead Free Status / RoHS Status: Not applicable / Not applicable
• Power - Output: -
• Lead Free Status / Rohs Status: Not Compliant

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Shutdown
The On/Off pin (J2) permits shutting off the converter by an
external switch. J2 must be taken below 0.8V with an open
collector or open drain device to disable the LM5033 out-
puts. Releasing the pin allows the circuit to resume normal
operation.
External Sync
The LM5033’s internal oscillator can be synchronized to an
external signal applied to the SYNC input pad. The external
FIGURE 4. Representative Waveforms
4
frequency must be higher than the free running frequency
set with the R
sync input pulse width must be between 15 ns and 150 ns,
with an amplitude of 1.8V - 3.0V at the SYNC pad. The
pulses are coupled to the LM5033 through a 100 pF capaci-
tor (C15).
The ground side of the external signal source must be
connected to the RTN pad which is adjacent to the SYNC
pad. Do not use the ground input pin (J1) for this signal’s
ground.
T
resistor (315 kHz with R
T
= 16.5 kΩ). The
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