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MAX8540 Datasheet(PDF) 4 Page - Maxim Integrated Products

No. de pieza MAX8540
Descripción Electrónicos  Synchronizable, High-Frequency Current- and Voltage-Mode PWM Controllers for Isolated Supplies
PDF  16 Pages
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Fabricante Electrónico  MAXIM [Maxim Integrated Products]
Página de inicio  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX8540 Datasheet(HTML) 4 Page - Maxim Integrated Products

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Synchronizable, High-Frequency Current- and
Voltage-Mode PWM Controllers for Isolated Supplies
4
_______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(VVCC = 12V, CREF = 1µF, VUV = VOV = VOPTO, VILIM = 2V, RFREQ/SYNC = 32.4k
Ω, CSS = 0.1µF, RMAXDTY = 97.6kΩ, VEN = 0,
RSCOMP = 68k
Ω, RPRAMP = 25kΩ, CSKTON = 0.01µF, CSKTOFF = 0.1µF, VCS = 0.6V, CDRV = 10pF, TA = 0°C to +85°C, unless otherwise
noted. Typical values are at TA = +25°C.)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
CDRV = 500pF, 90% to 10% of VVCC
27
Fall Time
CDRV = 2000pF, 90% to 10% of VVCC
53
ns
On-Resistance Pullup
9
Ω
On-Resistance Pulldown
7
Ω
SYNC (EXTERNAL FREQUENCY SYNCHRONIZATION)
Frequency Range
Frequency syncs
±30% of frequency set by external R
on FREQ pin
0.2
1.0
MHz
FREQ Input Threshold
(Note 4)
2
3
V
THERMAL SHUTDOWN
Thermal Shutdown
TA rising, 20
°C hysteresis
170
°C
ELECTRICAL CHARACTERISTICS
(VVCC = 12V, CREF = 1µF, VUV = VOV = 2V, RFREQ/SYNC = 32.4k
Ω, CSS = 0.1µF, RMAXDTY = 97.6kΩ, VEN = 0, RSCOMP = 68kΩ,
RPRAMP = 25k
Ω, CSKTON = 0.01µF, CSKTOFF = 0.1µF, VOPTO = 2V, VILIM = 4V, VCS = 0.6V, CDRV = 10pF, TA = -40°C to +85°C,
unless otherwise noted.) (Note 5)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
VCC
Operating Voltage Range
(Note 1)
7.6
18.0
V
VCC rising
7.6
8.4
Undervoltage Lockout
VCC falling
6.6
7.4
V
Undervoltage Lockout Hysteresis
0.9
V
No switching
4.2
Supply Current
VREF = is active,
IREF = 0
Switching with no load
6.3
mA
Shutdown Current
V EN = 3V
0.9
mA
REF
Output Voltage
IREF = 0
4.9
5.1
V
Load Regulation
IREF = 0 to 10mA
50
mV
Line Regulation
VVCC = 8.4V to 18V
20
mV
Shutdown Resistor
V EN = 3V
30
Ω
UNDERVOLTAGE/OVERVOLTAGE (UV/OV)
VUV falling, 120mV typical hysteresis
1.200
1.300
UVLO Threshold
VUV rising
1.083
1.173
V
Input Bias Current
-0.5
+0.5
µA
VOV falling, 130 mV typical hysteresis
2.901
3.142
OVLO Threshold
VOV rising
2.778
3.010
V



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