MAX8541 MAXIM [Maxim Integrated Products], MAX8541 Datasheet - Page 12

• Manufacturer Part Number: MAX8541
• Description: Synchronizable, High-Frequency Current- and Voltage-Mode PWM Controllers for Isolated Supplies
• Manufacturer: MAXIM [Maxim Integrated Products]

Pull V
enable the latch-off feature. In this mode, once the
SKTON time has elapsed, the IC is latched off. The cir-
cuit remains off until EN is toggled, or the input power is
toggled.
During startup, the capacitor at soft-start is charged
using a 5µA current source. Once the voltage at soft-
start reaches the threshold voltage (2V typ), the IC
switches normally. Use a low-ESR ceramic capacitor
placed as close as possible to the IC at soft-start. The
value is determined as follows:
where t
is in µF.
Refer to the following application notes for the
MAX8540/MAX8541 application circuits and applica-
tions information: 50W Current-Mode Forward
Converter Design with the MAX8540 and 50W Voltage-
Mode Forward Converter Design with the MAX8541.
Synchronizable, High-Frequency Current- and
Voltage-Mode PWM Controllers for Isolated Supplies
12
______________________________________________________________________________________
SKTOFF
SS
is the desired soft-start period in ms and C
to V
Applications Information
Soft-Start Capacitor Selection
REF
C
through a 10kΩ pullup resistor to
SS
=
530
t
SS
SS
TRANSISTOR COUNT: 2704
PROCESS: BiCMOS
TOP VIEW
Pin Configurations (continued)
FREQ/SYNC
MAXDTY
PRAMP
REF
OV
UV
SS
EN
1
2
6
3
4
5
7
8
MAX8541EEE
QSOP
Chip Information
16
15
14
13
12
11
10
9
V
DRV
GND
SKTON
CS
SKTOFF
ILIM
OPTO
CC