MAX5974DETE+ Maxim Integrated Products, MAX5974DETE+ Datasheet - Page 12

• Manufacturer Part Number: MAX5974DETE+
• Description: Current Mode PWM Controllers ACTIVE-CLAMPED CUR MODE PWM CONTLR
• Manufacturer: Maxim Integrated Products

Specifications of MAX5974DETE+

• Duty Cycle (max): 82 %
• Mounting Style: SMD/SMT
• Switching Frequency: 600 KHz
• Operating Supply Voltage: 12 V to 21 V
• Supply Current: 1.8 mA
• Maximum Operating Temperature: + 85 C
• Fall Time: 14 ns
• Minimum Operating Temperature: - 40 C
• Rise Time: 27 ns
• Package / Case: TQFN-16
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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 cur-
rent 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 trans-
former for synchronous flyback application.
Converter Supply Input. IN has wide UVLO hysteresis, enabling the design of efficient power sup-
plies. 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
mum rating of 26V.
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
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 MOSFET
ENF
. When the voltage on EN is above V
FUNCTION
MAX
below 75%.
IN
Pin Description (continued)
is always clamped below its absolute maxi-
ENR
, the device checks for other