ISL6551IR-T Intersil, ISL6551IR-T Datasheet - Page 20

• Manufacturer Part Number: ISL6551IR-T
• Description: IC CTRL PWM ZVS FULL BRDG 28-QFN
• Manufacturer: Intersil

Specifications of ISL6551IR-T

• Pwm Type: Current Mode
• Number Of Outputs: 6
• Frequency - Max: 1MHz
• Duty Cycle: 50%
• Voltage - Supply: 10.8 V ~ 13.2 V
• Buck: No
• Boost: No
• Flyback: Yes
• Inverting: No
• Doubler: No
• Divider: No
• Cuk: No
• Isolated: No
• Operating Temperature: 0°C ~ 85°C
• Package / Case: 28-VQFN Exposed Pad, 28-HVQFN, 28-SQFN, 28-DHVQFN
• Frequency-max: 1MHz
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Main Transformers
Full Bridge and Current Doubler - No center tap is
required. The secondary winding carries half of the load, i.e.,
only half of the load is reflected to the primary.
Conventional Full Bridge - Center tap is required on the
secondary side, and no center tap is required on the primary
side. The secondary winding carries all the load. i.e., all the
load is reflected to the primary.
Push-Pull and Current Doubler - Center tap is required on
the primary side, and no center tap is required on the
secondary side. The secondary winding carries half of the
load, i.e., only half of the load is reflected to the primary.
Conventional Push-Pull - Both primary and secondary
sides require center taps. The secondary winding carries all
the load, i.e., all the load is reflected to the primary.
FIGURE 18A. FULL BRIDGE AND CURRENT DOUBLER
FIGURE 18C. PUSH-PULL AND CURRENT DOUBLER
or CURRENT_SEN_P
FIGURE 18B. CONVENTIONAL FULL BRIDGE
or CURRENT_SEN_P
FIGURE 18D. CONVENTIONAL PUSH-PULL
V
P+
P–
P1–
IN
P2–
V
P1–
P2–
P+
P–
IN
F
F
20
S +
S–
V
S +
S–
S +
S–
V
OUT
S +
S–
OUT
F
F
ISL6551
Supervisor Circuits
(1) INTEGRATED SOLUTION
• Intersil ISL6550 Supervisor And Monitor (SAM). Its QFN
• Over-temperature protection (discrete)
• Input UV lockout (discrete)
(2) DISCRETE SOLUTION
• Differential Amplifier
• VCC undervoltage lockout
• Programmable output OV and UV
• Programmable output
• Status indicators (PGOOD and START)
• Precision Reference
• Ove- temperature protection
• Input UV lockout
The Integrated Solution is much simpler than a discrete
solution. Over-temperature protection and input under
voltage lockout can be added for better system protection
and performance.
The Discrete Solution requires a significant number of
components to implement the features that the ISL6550 can
provide.
package requires less space than the SOIC package.
VOPOUT
VREF5
BDAC
VOPOUT
OVUVTH
DACLO
VREF5
DACHI
VOPM
BDAC
VOPP
GND
VCC
FIGURE 19. ISL6550 SOIC
10
1
2
3
4
5
6
7
8
9
20
19
18
17
16
15
14
13
12
11
UVDLY
OVUVSEN
PGOOD
START
PEN
VID0
VID1
VID2
VID3
VID4
PGOOD
START
PEN
January 3, 2006
FN9066.5