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Si3500
Rev. 1.1
11
5. Pin Descriptions
Table 8. Si3500 Pin Descriptions (Top View)
Pin#
Name
Description
1
EROUT
Error-amplifier output and PWM input; directly connected to opto-coupler in isolated or
boost applications.
2
SSFT
Soft-start output pin ramps voltage across external soft-start capacitor to allow switcher
to ramp output slowly.
3
VDD
5 V supply rail for switcher; provides drive for opto-coupler.
4
ISOSSFT
 Isolated mode soft start enable input. Tie to VDD for non-isolated applications.
Connect a 0.1 礔 capacitor between this pin and VSSA for isolated applications.
5
NC
Do not connect (float).
6
RBIAS
A 25.5 kW resistor connected from this to VPOS sets up the bias currents of the
Si3500.
7
HSO
Hotswap switch output; connects to VNEG through hotswap switch.
8
NC
Do not connect (float).
9, Pad
VNEG
Rectified high-voltage supply, negative rail. Must be connected to thermal PAD node
(VNEG) on package bottom. This thermal pad must be connected to VNEG (pin #9) as
well as a 2 in
2
 heat spreader plane using a minimum of nine thermal vias.
10
NC
Do not connect (float).
11
NC
Do not connect (float).
12
VPOS1
High-voltage supply, positive rail (force node)
13
NC
Do not connect (float).
14
NC
Do not connect (float).
15
VSSA
Analog ground.
VNEG
(PAD)
EROUT
SSFT
NC
VPOSF
NC
NC
SOSSFT
VDD
5
6
7
8
9    10
15
16
20   19    18    17
1
2
3
4
11
12
13
14
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