Datasheet

MAX5094A/B/C/D/MAX5095A/B/C
High-Performance, Single-Ended, Current-Mode
PWM Controllers
10 ______________________________________________________________________________________
Pin Descriptions (continued)
PIN
MAX5095A/
MAX5095B
MAX5095C
NAME FUNCTION
1 1 COMP
Current Limit/PWM Comparator Input. COMP is level-shifted and connected to the
inverting input of the PWM comparator. Pull up COMP to REF through a resistor and
connect an optocoupler from COMP to GND for proper operation.
2 — SYNC
Bidirectional Synchronization Input. When synchronizing with other
MAX5095A/MAX5095Bs, the higher frequency part synchronizes all other devices.
—2
ADV_CLK
Advance Clock Output. ADV_CLK is an 85ns clock output pulse preceding the rising
edge of OUT (see Figure 4). Use the pulse to drive the secondary-side synchronous
rectifiers through a pulse transformer or an optocoupler (see Figure 8).
33CS
PWM Comparator/Overcurrent Protection Comparator Input. The current-sense signal is
compared to the level shifted voltage at COMP.
44R
T
/C
T
Timing Resistor/Capacitor Connection. A resistor R
T
from R
T
/C
T
to REF and capacitor C
T
from R
T
/C
T
to GND set the oscillator frequency.
5 5 GND
Power-Supply Ground. Place the V
CC
and REF bypass capacitors close to the IC to
minimize ground loops.
6 6 OUT MOSFET Driver Output. OUT connects to the gate of the external n-channel MOSFET.
77V
CC
Power-Supply Input. Bypass V
CC
to GND with a 0.1µF ceramic capacitor or a parallel
combination of a 0.1µF and a higher value ceramic capacitor.
8 8 REF
5V Reference Output. Bypass REF to GND with a 0.1µF ceramic capacitor or a parallel
combination of a 0.1µF and a higher value ceramic capacitor no larger than 4.7µF.
MAX5095_