max5020csat Maxim Integrated Products, Inc., max5020csat Datasheet - Page 9

• Manufacturer Part Number: max5020csat
• Description: Current-mode Pwm Controllers With Integrated Startup Circuit
• Manufacturer: Maxim Integrated Products, Inc.

to 2.4V, the internal voltage reference. Pull V
below 0.25V to disable the controller.
Undervoltage lockout shuts down the controller when
V
erence remain on during shutdown.
Figure 3. Nonisolated Flyback Converter
Figure 4. Isolated Flyback Converter
CC
Current-Mode PWM Controllers with Integrated
is less than 6.6V. The regulators for V+ and the ref-
_______________________________________________________________________________________
V
IN
V
IN
R
R
1
2
C
C
C
C
C
DD
CC
C
SS
DD
CC
SS
V
V
SS_SHDN
V
FB
V
SS_SHDN
DD
CC
DD
CC
SS_SHDN
MAX5019
MAX5020
MAX5019
MAX5020
NDRV
The current-sense (CS) comparator and its associated
logic limit the peak current through the MOSFET.
Current is sensed at CS as a voltage across a sense
resistor between the source of the MOSFET and GND.
To reduce switching noise, connect CS to the external
MOSFET source through a 100Ω resistor or an RC low-
NDRV
GND
GND
CS
V+
FB
CS
V+
N
N
T
T
C
100Ω
M1
C
100Ω
IN
IN
M1
N
P
N
P
R
SENSE
R
SENSE
N
N
Startup Circuit
S
S
Current-Sense Comparator
C
R
R
OUT
1
2
V
C
OUT
OUT
V
OUT
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