MAX5019 データシートの表示（PDF） - Maxim Integrated
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MAX5019 Datasheet PDF : 14 Pages
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Current-Mode PWM Controllers with Integrated
Startup Circuit
VIN
VDD
CDD
NT
V+
CIN
NP
NS
VOUT
COUT
VCC
MAX5019
MAX5020
NDRV
M1
CCC
SS_SHDN
CSS
CS
100Ω
RSENSE
R1
GND
FB
R2
Figure 3. Nonisolated Flyback Converter
VIN
CDD
R1
R2
CCC
CSS
NT
VOUT
VDD
V+
CIN
COUT
NP
NS
MAX5019
FB
MAX5020 NDRV
M1
VCC
SS_SHDN
CS
100Ω
RSENSE
GND
Figure 4. Isolated Flyback Converter
to 2.4V, the internal voltage reference. Pull VSS_SHDN
below 0.25V to disable the controller.
Undervoltage lockout shuts down the controller when
VCC is less than 6.6V. The regulators for V+ and the ref-
erence remain on during shutdown.
Current-Sense Comparator
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-
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