MAX5071 データシートの表示（PDF） - Maxim Integrated
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MAX5071 Datasheet PDF : 22 Pages
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High-Performance, Single-Ended, Current-Mode
PWM Controllers
Typical Operating Characteristics (continued)
(VCC = 15V, TA = +25°C, unless otherwise noted.)
OUT SOURCE AND SINK CURRENTS
MAX5070 toc20
VCC = 15V
COUT = 10nF
VOUT
10V/div
20Ons/div
IOUT
2A/div
SUPPLY CURRENT (ICC)
vs. OSCILLATOR FREQUENCY (CT = 100pF)
10
9
8
TA = +125°C
7
6
TA = +85°C
5
TA = +25°C
4
TA = -40°C
3
2
20 120 220 320 420 520 620 720 820 920 1020
FREQUENCY (kHz)
MAX5070A/MAX5071A
MAXIMUM DUTY CYCLE vs. RT
100
90
80
70
CT = 1nF
CT = 560pF
60
CT = 220pF
CT = 100pF
50
40
30
20
100
1k
10k
100k
RT (Ω)
Pin Descriptions
MAX5070A/MAX5070B
PIN
NAME
FUNCTION
1
COMP Error-Amplifier Output. COMP can be used for soft-start.
2
FB
Error-Amplifier Inverting Input
3
CS
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.
4
RT/CT
Timing Resistor and Capacitor Connection. A resistor RT from RT/CT to VREF and capacitor CT from
RT/CT to GND set the oscillator frequency.
5
GND
Power-Supply Ground. Place the VCC and VREF bypass capacitors close to the IC to minimize
ground loops.
6
OUT
MOSFET Driver Output. OUT connects to the gate of the external n-channel MOSFET.
7
VCC
Power-Supply Input for MAX5070. Bypass VCC to GND with a 0.1µF ceramic capacitor or a parallel
combination of a 0.1µF and a higher value ceramic capacitor.
8
VREF
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.
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