ISL78229 Datasheet, PDF (48/71 Pages) Intersil Corporation – 2-Phase Boost Controller with Drivers

ISL78229
VOUT_COMMAND (21h)
Definition: This command sets or reports VREF_DAC which is the reference for the output voltage regulation as described in “Output
Voltage Regulation Loop” on page 26.
The VOUT_COMMAND has two data bytes formatted as 16Lu (“Write/Read the 16Lu Data as the 8-Bit DAC Input” on page 42). The Bits
[15:8] are not used. The Bits [7:0] unsigned binary integer represents VREF_DAC value with 8mV LSB. Use Equation 22 on page 42 to
convert the 16Lu data’s 8-bit [7:0] unsigned binary integer to VREF_DAC, and use Equation 2 on page 26 to convert VREF_DAC to V_OUT.
Data Length in Bytes: 2
Data Format: 16Lu
Type: R/W
Protectable: Yes
Default Value: 00C8h. With 00C8h = 200(decimal) and 8mV/LSB, meaning V_REFDAC = 0.008 * 200 = 1.6V
Units: Volts
Equation: V_REFDAC = 0.008*VOUT_COMMAND as Equation 22 on page 42. Then use Equation 2 on page 26 to calculate V_OUT.
Range: 0 to 2.04V
Example: VOUT_COMMAND = 00C8h = 200(decimal), use Equation 22 on page 42, VREF_DAC = 0.008 * 200 = 1.6V
With R_FB1 = 4.53kΩ and R_FB2 = 97.6kΩ (Figure 4 on page 8), use Equation 2 on page 26 to get V_OUT = 36.07V
COMMAND
Format
Bit Position
Access
Function
Default Value
VOUT_COMMAND (21h)
16Lu
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W
See Following Table
0000000011001000
BIT NUMBER
7:0
15:8
Set/Read the VREF_DAC voltage
Not Used
MEANING
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FN8656.3
February 12, 2016