Datasheet

MAX17491
Single-Phase Synchronous MOSFET Driver
4 _______________________________________________________________________________________
Typical Operating Characteristics (continued)
(Circuit of Figure 1, V
DD
= 5V, C
DH
= 3nF, C
DL
= 3nF, T
A
= +25°C, unless otherwise noted.)
DH RISE AND FALL TIMES
vs. CAPACITIVE LOAD
CAPACITANCE (pF)
RISE AND FALL TIME (ns)
MAX17491 toc04
1000 2500 4000 5500 7000 8500 10,000
0
5
10
15
20
25
30
35
40
RISE TIME
FALL TIME
C
DL
= C
DH
DH AND DL RISE AND FALL TIMES
vs. TEMPERATURE
TEMPERATURE (°C)
RISE AND FALL TIME (ns)
MAX17491 toc05
-40 -15 10 35 60 85 110
10
15
20
25
30
35
40
DL RISE
DH RISE
DH FALL
DL FALL
DL FALL
DL IS DRIVING 2 SI7336ADP
DH IS DRIVING 1 SI7892ADP
PACKAGE-POWER DISSIPATION
vs. PWM FREQUENCY
PWM FREQUENCY (kHz)
PD (mW)
MAX17491 toc06
0 200 400 600 800 1000 1200
0
10
20
30
40
50
60
A
B
A: C
DH
= 3.3nF, C
DL
= 3.3nF
B: C
DH
= 1.5nF, C
DL
= 6.8nF
PROPAGATION DELAY TIME
vs. TEMPERATURE
TEMPERATURE (°C)
PROPAGATION DELAY TIME (ns)
MAX17491 toc07
-40 -15 10 35 60 85 110
8
9
10
11
12
13
14
15
16
PWM FALL TO DH FALL
PWM RISE TO DL FALL
TYPICAL APPLICATION CIRCUIT
SWITCHING WAVEFORMS
MAX17491 toc08
V
PWM
V
DL
10V/div
20V/div
5V/div
5V/div
100ns/div
V
LX
V
DH
DH FALL AND DL RISE WAVEFORMS
MAX17491 toc09
V
PWM
V
DL
10V/div
10V/div
5V/div
5V/div
20ns/div
V
LX
V
DH
DH RISE AND DL FALL WAVEFORMS
MAX17491 toc10
V
PWM
V
DL
10V/div
10V/div
5V/div
5V/div
20ns/div
V
LX
V
DH