ISL6551_15 Datasheet, PDF (21/27 Pages) Intersil Corporation – ZVS Full Bridge PWM Controller

Main Transformers
P+
S+
ISL6551
P–
S–
FIGURE 22A. FULL BRIDGE AND CURRENT DOUBLER
P+
S+
V_OUTF
P–
S–
FIGURE 22B. CONVENTIONAL FULL BRIDGE
P1–
S+
P1–
S+
V_INF
or CURRENT_SEN_P
P2–
S–
V_INF
or CURRENT_SEN_P
P2–
V_OUTF
S–
FIGURE 22C. PUSH-PULL AND CURRENT DOUBLER
FIGURE 22D. CONVENTIONAL PUSH-PULL
FIGURE 22. 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.
Supervisor Circuits
INTEGRATED SOLUTION
• Intersil ISL6550 Supervisor And Monitor (SAM). Its QFN
package requires less space than the SOIC package.
• Over-temperature protection (discrete)
• Input UV lockout (discrete)
DISCRETE SOLUTION
• Differential amplifier
• VCC undervoltage lockout
• Programmable output OV and UV
• Programmable output
• Status indicators (PGOOD and START)
• Precision reference
• Over-temperature protection
• Input UV lockout
VOPOUT
VREF5
BDAC
VCC ₁
VOPP ₂
VOPM ₃
VOPOUT ₄
VREF5 ₅
GND ₆
BDAC ₇
OVUVTH ₈
DACHI ₉
DACLO ₁₀
20 ^UVDLY
19 ^OVUVSEN
18 ^PGOOD
17 ^START
PGOOD
START
16 ^PEN
PEN
15 ^VID0
14 ^VID1
13 ^VID2
12 ^VID3
11 ^VID4
FIGURE 23. ISL6550 SOIC
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FN9066.6
April 30, 2015