LM3402HVEVAL National Semiconductor, LM3402HVEVAL Datasheet - Page 13

• Manufacturer Part Number: LM3402HVEVAL
• Description: BOARD EVALUATION FOR LM3402HV
• Manufacturer: National Semiconductor
• Series: PowerSmart®r

Specifications of LM3402HVEVAL

• Current - Output / Channel: 500mA
• Outputs And Type: 1, Non-Isolated
• Voltage - Output: 4 V
• Features: Dimmable
• Voltage - Input: 6 ~ 75 V
• Utilized Ic / Part: LM3402
• Core Chip: LM3402HV
• Topology: Buck
• Input Voltage: 6V To 75V
• Dimming Control Type: PWM
• Kit Contents: Board
• Svhc: No SVHC (15-Dec-2010)
• Kit Features: Cycle-by-Cycle Current Limit, Separate PWM Dimming
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: *LM3402HVEVAL

LOW POWER SHUTDOWN
The LM3402/02HV can be switched to a low power state (I
SD
MOSFET as shown in Figure 3. Low power MOSFETs like the
2N7000, 2N3904, or equivalent are recommended devices
for putting the LM3402/02HV into low power shutdown. Logic
gates can also be used to shut down the LM3402/02HV as
THERMAL SHUTDOWN
Internal thermal shutdown circuitry is provided to protect the
IC in the event that the maximum junction temperature is ex-
= 90 µA) by grounding the RON pin with a signal-level
FIGURE 3. Low Power Shutdown
IN-
13
long as the logic low voltage is below the over temperature
minimum threshold of 0.3V. Noise filter circuitry on the RON
pin can cause a few pulses with a longer on-time than normal
after RON is grounded or released. In these cases the OVP/
OCP comparator will ensure that the peak inductor or LED
current does not exceed 300 mV / R
ceeded. The threshold for thermal shutdown is 165°C with a
25°C hysteresis (both values typical). During thermal shut-
down the MOSFET and driver are disabled.
20192113
SNS
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