ISL6551_06 Datasheet, PDF (20/26 Pages) Intersil Corporation – ZVS Full Bridge PWM Controller

ISL6551
Main Transformers
P+
S+
P–
S–
FIGURE 18A. FULL BRIDGE AND CURRENT DOUBLER
P+
S+
V_OUTF
P–
S–
FIGURE 18B. CONVENTIONAL FULL BRIDGE
P1–
S+
V_INF
or CURRENT_SEN_P
P2–
S–
FIGURE 18C. PUSH-PULL AND CURRENT DOUBLER
P1–
S+
V_INF
or CURRENT_SEN_P
V_OUTF
P2–
S–
FIGURE 18D. CONVENTIONAL PUSH-PULL
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
(1) INTEGRATED SOLUTION
• Intersil ISL6550 Supervisor And Monitor (SAM). Its QFN
package requires less space than the SOIC package.
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 _PGOOD
17 ^START START
16 ^PEN
PEN
15 ^VID0
14 ^VID1
13 ^VID2
12 ^VID3
11 ^VID4
FIGURE 19. ISL6550 SOIC
• 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.
20
FN9066.5
January 3, 2006