el7520a Intersil Corporation, el7520a Datasheet - Page 17

• Manufacturer Part Number: el7520a
• Description: 4-channel Dc/dc Controller
• Manufacturer: Intersil Corporation

Over-Temperature Protection
An internal temperature sensor continuously monitor the die
temperature. In the event that the die temperature exceeds
the thermal trip point, the device will shut down. The upper
and lower trigger points are typically set to 130°C and -90°C
respectively.
Layout Recommendation
The device's performance including efficiency, output noise,
transient response and control loop stability is dramatically
affected by the PCB layout. PCB layout is critical, especially
at high switching frequency.
There are some general guidelines for layout:
A demo board is available to illustrate the proper layout
implementation.
1. Place the external power components (the input
2. Place V
3. Reduce the loop with large AC amplitudes and fast slew
4. The feedback network should sense the output voltage
5. The power ground (PGND) and signal ground (SGND)
capacitors, output capacitors, boost inductor and output
diodes, etc.) in close proximity to the device. Traces to
these components should be kept as short and wide as
possible to minimize parasitic inductance and resistance.
rate.
directly from the point of load, and be as far away from LX
node as possible.
pins should be connected at only one point.
REF
and V
DD
bypass capacitors close to the pins.
17
EL7520, EL7520A
July 12, 2005
FN7318.0