ISL1903 Datasheet, PDF (11/19 Pages) Intersil Corporation – Dimmable Buck LED Driver - AC Mains or DC Input LED Driver

ISL1903
Electrical Specifications Recommended operating conditions unless otherwise noted. Refer to “Functional Block Diagram -
ISL1903” on page 2 and “Typical Application schematics” beginning on page 3. V_DD = 17V, R_RAMP = 54kΩ, C_RAMP = 470pF, T_A = -40°C to
+125°C, Typical values are at T_A = +25°C; Boldface limits apply over the operating temperature range, -40°C to +125°C. (Continued)
PARAMETER
TEST CONDITIONS
MIN
MAX
(Note 7)
TYP
(Note 7)
UNITS
Unbiased Output Voltage Clamp
Frequency
VDD = 6V, I_LOAD = 3mA
-
-
1.9
V
291
320
349
Hz
Maximum Duty Cycle
REFIN = 0.5V
-
-
100
%
Minimum On-Time
REFIN = 0V
-
-
0.5
μs
OVP
OVP Threshold
1.46
1.50
1.54
V
OVP Hysteresis
10
20
27
μA
Input Bias Current
-1.0
-
1.0
μA
OVP Clamp Voltage
THERMAL PROTECTION
I_OVP = 1mA
5.4
-
7.0
V
Thermal Shutdown
(Note 8)
150
160
170
°C
Hysteresis
(Note 8)
-
25
-
°C
NOTES:
7. 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.
8. Limits established by characterization and are not production tested.
Test Waveforms and Circuits
8V
1 VDD
OUT 16
2 OFFREF PWMOUT 15
3 VREF
DHC 14 0 TO 1V 120Hz
4 IOUT
GND 13
5
ISL1903
CS+
AC 12
6 OC
OVP 11
1nF 2.2nF
7 FB
RAMP 10
8 DELADJ VERR 9
5k
470pF
54k
FIGURE 2. RISE/FALL TIME TEST CIRCUIT
OUT
OR
PWMOUT
tR
90%
10%
tF
FIGURE 3. RISE/FALL TIMES
11
FN8285.1
September 20, 2012