Rev.02
1
MSN12AD20-MQ EVB GUIDE
ELECTRICAL SPECIFICATION:
Parameters
Symbol
Value
Note
Input Voltage
VIN
6V~15.0V
Note 1
Output Voltage
VOUT
Adjust
Output Current
IOUT
20A
Enable Voltage
EN
1.3V~3.6V
Note 1. The input voltage of the EVB can range from 6V to 15V. The minimum 6V input voltage is limited
by the EN signal, which is derived from VIN through a resistor divider (R1 and R2). Lower input
voltage (as low as 4V) can be set by fine tuning the resistor divider values, or by over-driving
the EN (1.3V~3.6V) with an external control signal.
PROGRAMMING OUTPUT VOLTAGE:
(EQ.1)
Vout
1.2V
1.8V
3.3V
RFB (Ω)
10K
5K
2.21K
TABLE 1: OUTPUT VOLTAGE SETTING
PROGRAMMING OVER CURRENT LIMIT:
Calculate the current limit threshold setting from RCS with Equation 2 and recommend RCS as Table 2
for other output voltage (for Vin=12V, I
OCP
=23A operation)
(EQ.2)
Where VOCP=1.2V, GCS=10uA/A, L=0.47uH, fS=600KHz and IOCP is the desired output current limit
(A).
Vout
1V
1.2V
1.8V
3.3V
5V
RCS (Ω)
5.6K
5.62K
5.9K
6.34K
6.65K
TABLE 2: MODE SELECTION
FB
OUT
R
k
VV
10
16.0)(
SIN
OUTOUTIN
OCPCS
OCP
CS
fLV
VVV
IG
V
R
2
1
)(
Rev.02
2
MSN12AD20-MQ EVB GUIDE
PROGRAMMING SOFT START TIME:
The minimum soft-start time is limited at 1ms. It can be increased by adding a SS capacitor
between TRK and Vosns-. The total SS capacitor value can be determined with Equation (2):
(EQ.2)
EVALUATION BOARD SCHEMATIC:
QUICK START GUIDE:
1. Power the MSN12AD20-MQ module on when S8 open and S1 short.
2. Short S7~S3 can set output voltage from 1.0V to 5.0V
S6
S5
S4
Vout
1.2V
1.8V
3.3V
3. Short S8 can be turn off Power module.
nF
V
uAmsT
nFC
SS
SS
22
)(6.0
)(36)(
)(