MAX5974A MAXIM [Maxim Integrated Products], MAX5974A Datasheet - Page 12

• Manufacturer Part Number: MAX5974A
• Description: Active-Clamped, Spread-Spectrum, Current-Mode PWM Controllers
• Manufacturer: MAXIM [Maxim Integrated Products]

Active-Clamped, Spread-Spectrum,
Current-Mode PWM Controllers
12
PIN
10
11
12
13
14
15
16
—
6
7
8
9
AUXDRV
DCLMP
NAME
PGND
NDRV
CSSC
GND
CS
EN
FB
SS
EP
IN
Transconductance Amplifier Inverting Input
Signal Ground
Current Sense with Slope Compensation Input. A resistor connected from CSSC to CS programs
the amount of slope compensation. See the Programmable Slope Compensation section.
Current-Sense Input. Current-sense connection for average current sense and cycle-by-cycle
current limit. Peak current-limit trip voltage is 400mV and reverse current-limit trip voltage is
-100mV.
Power Ground. PGND is the return path for gate-driver switching currents.
Main Switch Gate-Driver Output
pMOS Active Clamp Switch Gate-Driver Output. AUXDRV can also be used to drive a pulse
transformer for synchronous flyback application.
Converter Supply Input. IN has wide UVLO hysteresis, enabling the design of efficient power
supplies. When the enable input EN is used to program a UVLO level for the power source,
connect a zener diode between IN and PGND to ensure that V
absolute maximum rating of 24V.
Enable Input. The gate drivers are disabled and the device is in a low-power UVLO mode when the
voltage on EN is below V
enable conditions. See the Enable Input section for more information about interfacing to EN.
Feed-Forward Maximum Duty-Cycle Clamp Programming Input. Connect a resistive divider
between the input supply voltage DCLMP and GND. The voltage at DCLMP sets the maximum
duty cycle (D
MOSFET remains protected during line transients.
Soft-Start Programming Capacitor Connection. Connect a capacitor from SS to GND to program
the soft-start period. This capacitor also determines hiccup mode current-limit restart time. A
resistor from SS to GND can also be used to set the D
Exposed Pad. Internally connected to GND. Connect to a large ground plane to maximize thermal
performance. Not intended as an electrical connection point.
MAX
) of the converter inversely proportional to the input supply voltage, so that the
ENF
. When the voltage on EN is above V
FUNCTION
Pin Description (continued)
MAX
below 75%.
IN
is always clamped below its
ENR
, the device checks for other