MAX17499AAUB データシートの表示（PDF） - Maxim Integrated
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MAX17499AAUB Datasheet PDF : 18 Pages
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Current-Mode PWM Controllers with
Programmable Switching Frequency
Typical Operating Characteristics (continued)
(VUVLO/EN = +1.4V, VFB = +1V, COMP = open, VCS = 0V, TA = +25°C, unless otherwise noted.)
NDRV HIGH-OUTPUT IMPEDANCE
vs. TEMPERATURE
5.0
SOURCING 20mA
4.6
4.2
3.8
3.4
3.0
-40 -15
10
35
60
85
TEMPERATURE (°C)
ERROR AMPLIFIER OPEN-LOOP GAIN
AND PHASE vs. FREQUENCY
MAX17499/500 toc22
100
120
80
80
60
40
40
GAIN
0
20
-40
0
-80
PHASE
-20
-120
-40
-160
-60
-200
0.1 1 10 100 1k 10k 100k 1M 10M 100M
FREQUENCY (Hz)
Pin Configuration
TOP VIEW
+
UVLO/EN 1
UFLG 2
FB 3
COMP 4
MAX17499
MAX17500
CS 5
μMAX
10 IN
9 VCC
8 NDRV
7 GND
6 RT
Pin Description
PIN
NAME
FUNCTION
Externally Programmable Undervoltage Lockout. UVLO/EN programs the input start voltage. Connect
1
UVLO/EN UVLO/EN to GND to disable the device. NDRV stops switching approximately 210μs after the UVLO/EN
voltage falls below 1.17V.
2
UFLG
Open-Drain Undervoltage Flag Output. UFLG is asserted low as soon as the UVLO/EN voltage falls below its
threshold.
3
FB Error-Amplifier Inverting Input
4
COMP Error-Amplifier Output
Current-Sense Input. Current-sense connection for PWM regulation and cycle-by-cycle current limit.
5
CS Connect to the high side of the sense resistor. An RC filter may be necessary to eliminate leading-edge
spikes. Current-limit trip voltage is 1V.
6
RT
Oscillator Timing Resistor Input. An RC network may be required to reduce jitter (see the Typical Application
Circuit).
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