MAX5003 データシートの表示（PDF） - Maxim Integrated
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MAX5003 Datasheet PDF : 16 Pages
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High-Voltage PWM
Power-Supply Controller
Typical Operating Characteristics (continued)
(VDD = +12V, RFREQ = 200kΩ, RMAXTON = 200kΩ, TA = +25°C, unless otherwise noted.)
VCC LOAD REGULATION
10
9
8
7
6
5
4
3
2 V+ = VES = 12V TO 36V
1 VDD = UNCONNECTED
0
0
5
10
15
20
ICC (mA)
MAXIMUM FREQUENCY vs. INPUT VOLTAGE
AND FET TOTAL GATE-SWITCHING CHARGE
350
300
30nC
250
25nC
200
20nC
10nC
150
15nC
100
50
0
12
13
14
15
16
V+ (V)
Pin Description
PIN
NAME
FUNCTION
1
V+
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
2
INDIV
connected between the main power line and AGND. Undervoltage lockout takes over and shuts down
the controller when VINDIV < 1.2V. INDIV bias is typically 0.01µA.
3
ES
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
4
FREQ
pin is internally regulated to 1.25V. Connect a resistor between this pin and AGND to set the PWM fre-
quency. Drive between VIL and VIH at four times the desired frequency for external synchronization.
5
SS
Soft-Start Capacitor Connection. Ramp time to full current limit is approximately 0.5ms/nF. Limits duty
cycle when VSS < VCON.
6
REF
Reference Voltage Output (3.0V). Bypass to AGND with a 0.1µF capacitor.
7
CON
Control Input of the PWM Comparator
8
COMP
Compensation Connection. Output of the error amplifier, available for compensation.
9
FB
Feedback Input. Regulates to VFB = VREF / 2 = 1.5V.
Maximum On-Time Programming. A resistor from MAXTON to AGND sets the PWM gain and limits the
10
MAXTON
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.
6 _______________________________________________________________________________________
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