MAX5071 Maxim Integrated Products, MAX5071 Datasheet - Page 9

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

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(V
MAX5070A/MAX5070B
High-Performance, Single-Ended, Current-Mode
CC
V
OUT SOURCE AND SINK CURRENTS
CC
= 15V, T
PIN
= 15V
1
2
3
4
5
6
7
8
C
OUT
= 10nF
A
20Ons/div
= +25°C, unless otherwise noted.)
NAME
COMP
R
VREF
GND
OUT
V
_______________________________________________________________________________________
CS
T
FB
CC
/C
T
MAX5070 toc20
Error-Amplifier Output. COMP can be used for soft-start.
Error-Amplifier Inverting Input
Input to the PWM Comparator and Overcurrent Protection Comparator. The current-sense signal is
compared to a signal proportional to the error-amplifier output voltage.
Timing Resistor and Capacitor Connection. A resistor R
R
Power-Supply Ground. Place the V
ground loops.
MOSFET Driver Output. OUT connects to the gate of the external n-channel MOSFET.
Power-Supply Input for MAX5070. Bypass V
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
/C
T
V
10V/div
I
2A/div
OUT
OUT
to GND set the oscillator frequency.
10
Typical Operating Characteristics (continued)
9
8
7
6
5
4
3
2
vs. OSCILLATOR FREQUENCY (C
20
120
T
A
220 320 420 520
= +85°C
SUPPLY CURRENT (I
FREQUENCY (kHz)
T
A
T
CC
= +125°C
A
= -40°C
and VREF bypass capacitors close to the IC to minimize
620 720 820 920 1020
T
CC
CC
A
FUNCTION
= +25°C
T
)
to GND with a 0.1µF ceramic capacitor or a parallel
= 100pF)
T
PWM Controllers
from R
100
90
80
70
60
50
40
30
20
T
/C
100
T
to VREF and capacitor C
MAXIMUM DUTY CYCLE vs. R
Pin Descriptions
MAX5070A/MAX5071A
1k
R
T
(Ω)
10k
C
C
C
C
T
T
T
T
= 1nF
= 560pF
= 220pF
= 100pF
T
from
T
100k
9