GS-R405S STMicroelectronics, GS-R405S Datasheet - Page 4

• Manufacturer Part Number: GS-R405S
• Description: IC REG SW STEP DOWN 4A 5.1V
• Manufacturer: STMicroelectronics
• Series: GS-R400r
• Type: Point of Load (POL) Non-Isolatedr

Specifications of GS-R405S

• Output: 5.1V
• Number Of Outputs: 1
• Power (watts): 20W
• Mounting Type: Through Hole
• Voltage - Input: 9 ~ 46V
• Package / Case: Module
• 1st Output: 5.1 VDC @ 4A
• Size / Dimension: 3.37" L x 2.64" W x 0.84" H (85.5mm x 67mm x 21.3mm)
• Power (watts) - Rated: 20W
• Operating Temperature: -20°C ~ 85°C
• Efficiency: 70%
• Output Voltage: 5.1 V
• Output Current: 4 A
• Input Voltage: 9 V to 46 V
• Switching Frequency: 100 KHz
• Operating Temperature Range: - 20 C to + 85 C
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• 3rd Output: -
• 2nd Output: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 497-8273; GS-R405S

Figure 2. Remote Inhibit Operation
V
Current Limiting Programming
The GS-R400VB current limiting is programmed by
using a resistor (see pin function table and fig. 4).
is a limitation, a 22 F ceramic multilayer capacitor
must be connected to the module input pins.
Output Voltage Programming
The GS-R400V and GS-R400VB output voltage is
programmed by using a resistor (see pin function
table and fig. 4). The resistor must be located very
close the module and the PCB layout must
mimimize injected noise. The value of the resistor
is calculated by using the following formula:
Figure 1. Load Connection
GS-R400 FAMILY
4/5
o
can be adjusted between 5.1 and 40V.
R
v
2.67
5.1
V
o
–1 k
Figure 3. Reset Operation
The value of the resistor is calculated by using the
following formula:
Module Protection
The modules are protected against occasional and
permanent short circuits of the output pin to ground,
as well as against output current overload.
When the output current exceeds the maximum
value, the output is automatically disabled. After a
fixed time the module starts again in a soft mode.
The cycle is repeated until the overload condition is
removed.
A crowbar output overvoltage protection is activated
whenever the output voltage exceeds the nominal
output voltage by more than 25%.
R
i
= [2.2 + (5 I
o
)] k