ISL6752 Datasheet, PDF (7/16 Pages) Intersil Corporation – ZVS Full-Bridge Current-Mode PWM with Adjustable Synchronous Rectifier Control

ISL6752
Electrical Specifications
Recommended operating conditions unless otherwise noted. Refer to “Functional Block Diagram” on page 2
and “Typical Application - High Voltage Input Primary Side Control ZVS Full-Bridge Converter” on page 3 and
“Typical Application - High Voltage Input Secondary Side Control ZVS Full-Bridge Converter” on page 4.
9V < VDD < 20V, RTD = 10.0kΩ, CT = 470pF, T_A = -40°C to +105°C, Typical values are at T_A = +25°C;
Parameters with MIN and/or MAX limits are 100% tested at +25°C, unless otherwise specified. Temperature
limits established by characterization and are not production tested. (Continued)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
VADJ Delay Time
T_A = +25°C (OUTLx Delayed) (Note 6)
VADJ = 0
280
300
320
ns
VADJ = 0.5V
92
105
118
ns
VADJ = 1.0V
61
70
80
ns
VADJ = 1.5V
48
55
65
ns
VADJ = 2.0V
41
50
58
ns
T_A = +25°C (OUTLxN Delayed)
VADJ = VREF
280
300
320
ns
VADJ = VREF - 0.5V
86
100
114
ns
VADJ = VREF - 1.0V
59
68
77
ns
VADJ = VREF - 1.5V
47
55
62
ns
VADJ = VREF - 2.0V
41
48
55
ns
THERMAL PROTECTION
Thermal Shutdown
(Note 3)
130
140
150
°C
Thermal Shutdown Clear
(Note 3)
115
125
135
°C
Hysteresis, Internal Protection
(Note 3)
-
15
-
°C
NOTES:
3. Limits established by characterization and are not production tested..
4. This is the maximum duty cycle achievable using the specified values of RTD and CT. Larger or smaller maximum duty cycles may be obtained
using other values for these components. See Equations 1 through 3.
5. Adjust VDD below the UVLO stop threshold prior to setting at 7V.
6. When OUTx is delayed relative to OUTLxN (VADJ < 2.425V), the delay duration as set by VADJ should not exceed 90% of the CT discharge
time (deadtime) as determined by CT and RTD.
Typical Performance Curves
1.02
1.01
1.00
0.99
0.98
-40 -25 -10 5 20 35 50 65 80 95 110
TEMPERATURE (°C)
FIGURE 1. REFERENCE VOLTAGE vs TEMPERATURE
25
24
23
22
21
20
19
18
0
200
400
600
800
RTD CURRENT (µA)
1000
FIGURE 2. CT DISCHARGE CURRENT GAIN vs RTD CURRENT
7
FN9181.3
October 31, 2008