MAX5071 Maxim Integrated Products, MAX5071 Datasheet - Page 10

• Manufacturer Part Number: MAX5071
• Description: (MAX5070 / MAX5071) Current-Mode PWM Controllers
• Manufacturer: Maxim Integrated Products

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High-Performance, Single-Ended, Current-Mode
PWM Controllers
MAX5071A/MAX5071B/MAX5071C
10
MAX5071A/
MAX5071B
______________________________________________________________________________________
—
1
2
3
4
5
6
7
8
PIN
MAX5071C
—
1
2
3
4
5
6
7
8
ADV_CLK
NAME
COMP
SYNC
R
GND
V
OUT
V
CS
T
REF
CC
/C
T
COMP is level-shifted and connected to the inverting input of the PWM comparator. Pull
up COMP to VREF through a resistor and connect an optocoupler from COMP to GND for
proper operation.
Bidirectional Synchronization Input. When synchronizing with other
MAX5071A/MAX5071Bs, the higher frequency part synchronizes all other devices.
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).
Input to the PWM Comparator and Overcurrent Protection Comparator. The current-
sense signal is compared to the voltage at COMP.
Timing Resistor and Capacitor Connection. A resistor R
capacitor C
Power-Supply Ground. Place the V
minimize ground loops.
MOSFET Driver Output. OUT connects to the gate of the external n-channel MOSFET.
Power-Supply Input for MAX5071. Bypass V
a parallel combination of a 0.1µF and a higher value ceramic capacitor.
5V Reference Output. Bypass VREF to GND with a 0.1µF ceramic capacitor or a parallel
combination of a 0.1µF and a higher value ceramic capacitor.
T
from R
T
/C
T
to GND set the oscillator frequency.
CC
Pin Descriptions (continued)
and VREF bypass capacitors close to the IC to
FUNCTION
CC
to GND with a 0.1µF ceramic capacitor or
T
from R
T
/C
T
to VREF and