ISL6741IB Intersil, ISL6741IB Datasheet - Page 10

• Manufacturer Part Number: ISL6741IB
• Description: IC CTRLR PWM DBL-ENDED 16-SOIC
• Manufacturer: Intersil

Specifications of ISL6741IB

• Pwm Type: Current Mode
• Number Of Outputs: 2
• Frequency - Max: 2MHz
• Duty Cycle: 100%
• Voltage - Supply: 9 V ~ 16 V
• Buck: No
• Boost: No
• Flyback: No
• Inverting: No
• Doubler: No
• Divider: No
• Cuk: No
• Isolated: No
• Operating Temperature: -40°C ~ 105°C
• Package / Case: 16-SOIC (3.9mm Width)
• Frequency-max: 2MHz
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Typical Performance Curves
Pin Descriptions
VDD - V
noise immunity, bypass V
capacitor as close to the V
The total supply current, I
applied to outputs OUTA and OUTB. Total I
sum of the quiescent current and the average output current.
Knowing the operating frequency, f
loading capacitance charge, Q, per output, the average
output current can be calculated from:
SYNC - A bidirectional synchronization signal used to
coordinate the switching frequency of multiple units.
Synchronization may be achieved by connecting the SYNC
signal of each unit together or by using an external master
clock signal. The oscillator timing capacitor, C
required regardless of the synchronization method used.
The paralleled unit with the highest oscillator frequency
assumes control.
I
OUT
FIGURE 1. REFERENCE VOLTAGE vs TEMPERATURE
=
1•10
1•10
1.001
1.000
0.999
0.998
0.997
DD
FIGURE 3. DEADTIME (TD) vs CAPACITANCE
2 Q f
100
10
•
4
3
10
-40
is the power connection for the IC. To optimize
CT (pF) =
1000
680
470
330
220
100
•
-25 -10
SW
20
30
A
5
DD
DD
40
TEMPERATURE (°C)
DD
, will be dependent on the load
10
20
to GND with a ceramic
and GND pins as possible.
RTD (kΩ)
50
35
SW
60
50
, and the output
70
65
DD
80
T
80
, is always
current is the
90
95 110
ISL6740, 1SL6741
100
(EQ. 1)
RTC - This is the oscillator timing capacitor charge current
control pin. A resistor is connected between this pin and
GND. The current flowing through the resistor determines
the magnitude of the charge current. The charge current is
nominally twice this current. The PWM maximum ON time is
determined by the timing capacitor charge duration.
RTD - This is the oscillator timing capacitor discharge
current control pin. A resistor is connected between this pin
and GND. The current flowing through the resistor
determines the magnitude of the discharge current. The
discharge current is nominally 50x this current. The PWM
deadtime is determined by the timing capacitor discharge
duration.
CT - The oscillator timing capacitor is connected between
this pin and GND.
VERROR - The inverting input of the PWM comparator. The
error voltage is applied to this pin to control the duty cycle.
Increasing the signal level increases the duty cycle. The
FIGURE 2. OSCILLATOR C
1•10
1•10
1•10
65
60
55
50
45
40
FIGURE 4. CAPACITANCE vs FREQUENCY
6
5
4
0
10
RTD = 10k
CT (pF) =
50 100 150 200 250 300 350 400 450 500
100
220
330
470
20
30
RTD CURRENT (µA)
40
T
DISCHARGE CURRENT GAIN
RTC (kΩ)
50
1000
680
60
70
80
90
July 13, 2007
FN9111.4
100