Datasheet

MAX17499/MAX17500
Current-Mode PWM Controllers with
Programmable Switching Frequency
6 _______________________________________________________________________________________
SWITCHING FREQUENCY
vs. TIMING RESISTOR
MAX17499/500 toc13
TIMING RESISTOR (kΩ)
SWITCHING FREQUENCY (kHz)
10010
100
10001
1000
10
MAX17499A/MAX17500A
PROPAGATION DELAY FROM
CURRENT-LIMIT COMPARATOR
INPUT TO NDRV vs. TEMPERATURE
MAX17499/500 toc14
TEMPERATURE (°C)
t
PDCS
(ns)
603510-15
45
50
55
60
40
-40
85
UVLO/EN-TO-NDRV PROPAGATION DELAY
vs. TEMPERATURE
MAX17499/500 toc15
TEMPERATURE (°C)
UVLO DELAY (ms)
603510-15
1
2
3
4
5
6
0
-40
85
UVLO/EN RISING
UVLO/EN FALLING
206μs
UVLO/EN-TO-UFLG PROPAGATION DELAY
vs. TEMPERATURE
MAX17499/500 toc16
TEMPERATURE (°C)
UVLO DELAY (μs)
603510-15
1
2
3
4
5
6
0
-40
85
UVLO/EN RISING
UVLO/EN FALLING
REFERENCE VOLTAGE
vs. TEMPERATURE
MAX17499/500 toc17
TEMPERATURE (°C)
REFERENCE VOLTAGE (V)
603510-15
1.229
1.230
1.231
1.232
1.228
-40
85
V
IN
= 12V
INPUT CURRENT
vs. IN VOLTAGE
MAX17499/500 toc18
IN VOLTAGE (V)
INPUT CURRENT (mA)
1817161514131211
1.64
1.68
1.72
1.76
1.80
1.60
10
19
UVLO/EN = 1.4V
NDRV SWITCHING AT 350kHz
INPUT CLAMP VOLTAGE
vs. TEMPERATURE
MAX17499/500 toc19
TEMPERATURE (°C)
INPUT CLAMP VOLTAGE (V)
6040200-20
25.2
25.4
25.6
25.8
26.0
26.2
26.4
26.6
26.8
27.0
25.0
-40
80
I
IN
= 2mA
NDRV LOW-OUTPUT IMPEDANCE
vs. TEMPERATURE
MAX17499/500 toc20
TEMPERATURE (°C)
R
ON
(Ω)
603510-15
1.4
1.6
1.8
2.0
2.2
2.4
1.2
-40
85
V
IN
= 24V
SINKING 100mA
Typical Operating Characteristics (continued)
(V
UVLO/EN
= +1.4V, V
FB
= +1V, COMP = open, V
CS
= 0V, T
A
= +25°C, unless otherwise noted.)