MAX5003EEE-T Maxim Integrated Products, MAX5003EEE-T Datasheet - Page 6

• Manufacturer Part Number: MAX5003EEE-T
• Description: Voltage Mode PWM Controllers PWM Power-Supply Controller
• Manufacturer: Maxim Integrated Products

Specifications of MAX5003EEE-T

• Topology: Flyback, Forward
• Output Current: 1000 mA
• Switching Frequency: 300 KHz
• Duty Cycle (max): 75 %
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Package / Case: QSOP-16
• Mounting Style: SMD/SMT
• Synchronous Pin: Yes

High-Voltage PWM
Power-Supply Controller
6
(V
DD
PIN
10
_______________________________________________________________________________________
1
2
3
4
5
6
7
8
9
= +12V, R
MAXTON
NAME
COMP
INDIV
FREQ
CON
10
REF
V+
ES
SS
FB
9
8
7
6
5
4
3
2
1
0
FREQ
0
V+ = V
V
= 200kΩ, R
DD
= UNCONNECTED
ES
V
CC
Preregulator Input. Connect to the power line for use with 25V to 110V line voltages. Bypass V+ to ground
with a 0.1µF capacitor, close to the IC. Connects internally to the drain of a depletion FET preregulator.
Undervoltage Sensing and Feed-Forward Input. Connect to the center point of an external resistive divider
connected between the main power line and AGND. Undervoltage lockout takes over and shuts down
the controller when V
Preregulator Output. When V+ ranges above 36V, bypass ES to AGND with a 0.1µF capacitor close to
the IC. When V+ is always below 36V, connect ES to V+.
Oscillator Frequency Adjust and Synchronization Input. In internal free-running mode, the voltage on this
pin is internally regulated to 1.25V. Connect a resistor between this pin and AGND to set the PWM fre-
quency. Drive between V
Soft-Start Capacitor Connection. Ramp time to full current limit is approximately 0.5ms/nF. Limits duty
cycle when V
Reference Voltage Output (3.0V). Bypass to AGND with a 0.1µF capacitor.
Control Input of the PWM Comparator
Compensation Connection. Output of the error amplifier, available for compensation.
Feedback Input. Regulates to V
Maximum On-Time Programming. A resistor from MAXTON to AGND sets the PWM gain and limits the
maximum duty cycle. The voltage on MAXTON tracks the voltage on the INDIV pin. Maximum on-time is
proportional to the value of the programming resistor. The maximum duty cycle is limited to 75%, regard-
less of the programming resistor.
5
= 12V TO 36V
LOAD REGULATION
I
MAXTON
CC
10
(mA)
SS
= 200kΩ, T
< V
15
CON
INDIV
Typical Operating Characteristics (continued)
.
IL
20
A
< 1.2V. INDIV bias is typically 0.01µA.
and V
= +25°C, unless otherwise noted.)
FB
IH
= V
at four times the desired frequency for external synchronization.
REF
/ 2 = 1.5V.
FUNCTION
350
300
250
200
150
100
50
0
MAXIMUM FREQUENCY vs. INPUT VOLTAGE
AND FET TOTAL GATE-SWITCHING CHARGE
12
15nC
10nC
13
20nC
V+ (V)
14
25nC
Pin Description
30nC
15
16