MAX17499 Maxim Integrated Products, MAX17499 Datasheet - Page 4

• Manufacturer Part Number: MAX17499
• Description: (MAX17499 / MAX17500) Current-Mode PWM Controllers
• Manufacturer: Maxim Integrated Products

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Current-Mode PWM Controllers with
Programmable Switching Frequency
ELECTRICAL CHARACTERISTICS (continued)
(V
MAX17500A), R12 = 7.5kΩ (MAX17499B/MAX17500B), R15 = 1kΩ, C6 = 100nF (see the Typical Application Circuit ), NDRV = open,
V
+25°C.) (Note 1)
(V
4
Note 1: All devices are 100% tested at T
Note 2: The MAX17500 is intended for use in universal input power supplies. The internal clamp circuit at IN is used to prevent the
Note 3: V
Note 4: The oscillator in the MAX17499A/MAX17500A is capable of operating up to 2500kHz. However, the NDRV switching fre-
OSCILLATOR
Oscillator Frequency Range
Oscillator Frequency Accuracy
NDRV Switching Frequency
(Note 4)
Maximum Duty Cycle
UVLO/EN
IN
UVLO/EN
21.8
21.7
21.6
21.5
21.4
21.3
_______________________________________________________________________________________
= +12V (for MAX17500, bring V
-40
MAX17500 V
bootstrap capacitor (C1 in Figure 1) from charging to a voltage beyond the absolute maximum rating of the device when
UVLO/EN is low (shutdown mode). Externally limit the maximum current to IN (hence to clamp) to 2mA maximum when
UVLO/EN is low. Clamp currents higher than 2mA may result in a clamp voltage higher than 30V, thus exceeding the
absolute maximum rating for IN. For the MAX17499, do not exceed the 24V maximum operating voltage of the device.
quency is limited to operate up to 625kHz. Thus, the oscillator frequency for the MAX17499A/MAX17500A must be limited to
1250kHz (maximum).
BOOTSTRAP UVLO WAKE-UP LEVEL
= +1.4V, V
REF
PARAMETER
= +1.4V, V
-15
is measured with FB connected to COMP (see the Functional Diagram ).
vs. TEMPERATURE
IN
TEMPERATURE (°C)
RISING
10
FB
FB
= +1.0V, COMP = open, V
= +1V, COMP = open, V
35
60
IN
SYMBOL
D
up to 23.6V for startup), 10nF bypass capacitors at IN and V
f
OSC
f
A
MAX
85
SW
= +125°C. All limits over temperature are guaranteed by characterization.
10.3
10.1
CS
9.9
9.7
9.5
9.3
f
f
MAX17499A/MAX17500A, f
MAX17499B/MAX17500B, f
MAX17499A/MAX17500A
MAX17499B/MAX17500B
OSC
OSC
CS
-40
= 0V, T
BOOTSTRAP UVLO SHUTDOWN LEVEL
MAX17500 V
= 0V, T
= 200kHz to 800kHz
= 50kHz to 2500kHz
-15
A
A
vs. TEMPERATURE
= +25°C, unless otherwise noted.)
IN
TEMPERATURE (°C)
CONDITIONS
= -40°C to +125°C, unless otherwise noted. Typical values are at T
FALLING
10
Typical Operating Characteristics
35
SW
SW
60
= f
= f
OSC
OSC
85
/2
/4
1.236
1.234
1.232
1.230
1.228
1.226
1.224
12.5
MIN
-10
-20
50
25
-40
UVLO/EN RISING
UVLO/EN WAKE-UP THRESHOLD
CC
-15
, R12 = 15kΩ (MAX17499A/
TYP
vs. TEMPERATURE
50
75
TEMPERATURE (°C)
10
625.0
MAX
2500
+10
+20
625
35
60
UNITS
kHz
kHz
%
%
A
85
=
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