ISL6551EVAL1 Intersil, ISL6551EVAL1 Datasheet - Page 16

• Manufacturer Part Number: ISL6551EVAL1
• Description: EVALUATION BOARD ISL6551
• Manufacturer: Intersil

Specifications of ISL6551EVAL1

• Main Purpose: DC/DC, Step Down
• Outputs And Type: 1, Isolated
• Voltage - Output: 3.3V
• Current - Output: 60A
• Voltage - Input: 36 ~ 75V
• Regulator Topology: Buck
• Frequency - Switching: 470kHz
• Board Type: Fully Populated
• Utilized Ic / Part: ISL6551
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Power - Output: -

Additional Applications Information
Table 1 highlights parameter setting for the ISL6551.
Designers can use this table as a design checklist. For
VDD = 12V at room temperature, unless otherwise stated.
Frequency
Dead Time
Resonant Delay
Ramp Adjust
Current Sense
Peak Current
Bandgap Reference
Leading Edge Blanking
Current Share Compensation
Soft-Start & Output Rise Time
Clamp Voltage (Vclamp)
Error Amplifier
Share Support
Latching Shutdown
Power Good
IC Enable
Reference Ground
Power Ground
Upper Drivers
Lower Drivers
Synchronous Drive Signals
Bias for Control Circuits
Biases for Bridge Drivers
PARAMETER
16
LOWER1, LOWER2 Capacitive load up to 1.6nF at Fsw = 500kHz
UPPER1, UPPER2 Capacitive load up to 1.6nF at Fsw = 500kHz
EANI, EAI, EAO
SYNC1, SYNC2
VDDP1, VDDP2
R_RESDLY
PIN NAME
CS_COMP
ON/OFF
ISENSE
BGREF
SHARE
PKILIM
R_LEB
LATSD
DCOK
PGND
R_RA
TABLE 1. PARAMETER SETTING HIGHLIGHTS/CHECKLIST
CSS
VDD
CSS
VSS
CT
RD
Set 50% Duty Cycle Pulses with a fixed frequency
DT = M x RD/kΩ, where M = 11.4
t
Vramp = BGREF/(R_RA x 500E-12) x dt
<Vclamp-200mV-Vramp
<BGREF and slightly higher than Vclamp
1.263V ±2%, 399kΩ pull-up, No more than 100µA load
t
0.1µ for a low current loop bandwidth (100 - 500Hz)
t
Vclamp = Iss x Rcss, or Reference-based clamp
EANI, EAO < Vclamp
30K load & a resistor (1K, typ.) between EANI and OUTPUT REF.
Latch IC off at > 3V
±5% with hysteresis, Sink up to 5mA, transient rejection
Turn on/off at TTL level
Connect to PGND in only one single point
Single point to VSS plane
Capacitive load up to 20pF at Fsw = 500kHz
12V ±10%, 0.1µF decoupling capacitor
Need decoupling capacitors
RESDLY
LEB
ss
= Vclamp x Css/Iss, t
= 2 x R_LEB/kΩ + 15, never leave it floating
= 4.01 x R_RESDLY/kΩ + 13
ISL6551
FORMULA OR SETTING HIGHLIGHT
detailed operation of the ISL6551, see Block/Pin Functional
Descriptions.
rise
= EANI x CSS / Iss, Iss = 10µA ±20%
UNIT
kHz
Hz
ns
ns
ns
V
V
V
V
S
V
V
V
V
V
V
V
-
-
-
-
-
-
January 3, 2006
FIGURE #
11, 12
1, 2
8, 9
4, 5
10
3
7
6
4
FN9066.5
-
-
-
-
-
-
-
-
-
-
-
-
-
-