MAX15001 Maxim Integrated Products, MAX15001 Datasheet - Page 7

• Manufacturer Part Number: MAX15001
• Description: (MAX15000 / MAX15001) Current-Mode PWM Controllers
• Manufacturer: Maxim Integrated Products

(V
UVLO/EN
PIN
10
1
2
3
4
5
6
7
8
9
= +1.4V, V
UVLO/EN
NAME
COMP
NDRV
UFLG
GND
5.0
4.6
4.2
3.8
3.4
3.0
V
CS
FB
RT
IN
CC
-40
SOURCING 20mA
_______________________________________________________________________________________
NDRV HIGH OUTPUT IMPEDANCE
FB
Externally Programmable Undervoltage Lockout. UVLO/EN programs the input start voltage. Connect
UVLO/EN to GND to disable the device. NDRV stops switching approximately 210µs after the UVLO/EN
voltage falls below 1.17V.
Open-Drain Undervoltage Flag Output. UFLG is asserted low as soon as the UVLO/EN voltage falls below its
threshold.
Error-Amplifier Inverting Input
Error-Amplifier Output
Current-Sense Input. Current-sense connection for PWM regulation and cycle-by-cycle current limit.
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.
Oscillator Timing Resistor Input. An RC network may be required to reduce jitter (see the Typical Application
Circuit).
Ground Connection
External n-Channel MOSFET Gate Connection
Gate-Drive Supply. Internally generated supply from IN. Decouple V
to GND.
IN Supply. Decouple with a 10nF or larger capacitor to GND. For bootstrapped operation (MAX15000),
connect a startup resistor from the input supply line to IN. Connect the bias winding supply to IN also (see
the Typical Operating Circuit). For the MAX15001, connect IN directly to the 9.5V to 24V supply.
-15
= +1V, COMP = open, V
vs. TEMPERATURE
TEMPERATURE ( C)
10
Programmable Switching Frequency
Current-Mode PWM Controllers with
35
60
Typical Operating Characteristics (continued)
CS
85
= 0V, T
A
= +25°C, unless otherwise noted.)
FUNCTION
100
-20
-40
-60
80
60
40
20
0
0.1
ERROR AMPLIFIER OPEN-LOOP GAIN
1
AND PHASE vs. FREQUENCY
10 100
CC
FREQUENCY (Hz)
with a 10nF or larger capacitor
1k 10k 100k 1M 10M 100M
PHASE
GAIN
Pin Description
MAX15000 toc22
120
80
40
0
-40
-80
-120
-160
-200
7