CS1630/31
6.7 Configuration 2 (Config2) – Address 34
7
6
5
4
3
2
1
0
CLAMP1
CLAMP0
T2COMP
-
-
-
VALLEYSW
-
Number
Name
Description
Configures the offset adjustment for the minimum measurable peak current
level on the second stage sense resistor when the gate drive is turned on.
CLAMP[1:0] is an unsigned integer in the range of 0value3. The voltage on
the FBSENSE pin that corresponds to the minimum peak current is calculated
using the following formula:
[7:6]
CLAMP[1:0]
IPEAK[2:0] + 1 16 + 15 – CLAMP[1:0] 8 + 8
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1.4
512
Configures T2 measurement compensation for second stage flyback designs
with a large delay between the fall of the primary current and the rise of the
secondary current during the switching cycle. When using this feature, the
measured T2 time (measured from the falling edge of the gate drive) is
adjusted to obtain the actual T2 time, allowing the control loop to tightly regu-
late the output currents and reduce errors.
[5]
T2COMP
0 = Disable T2 measurement compensation
1 = Enable T2 measurement compensation
[4:2]
[1]
-
Reserved
Configures quasi-resonant switching (valley switching) on the second stage.
0 = Disables valley switching on the second stage
VALLEYSW
-
1 = Enables valley switching on the second stage
[0]
Reserved
DS954F2
31
APEX [ CIRRUS LOGIC ]
