HV9912
Preliminary
Electrical Characteristics
(cont.)
(Over recommended operating conditions. V
IN
= 24V, T
A
= 25°C, unless otherwise specified)
Sym
Oscillator
f
OSC1
f
OSC2
D
MAX
V
SYNCH
V
SYNCL
I
OUTSYNC
G
SC
V
OMIN
Parameter
Min
Typ
Max
Units
Conditions
Oscillator frequency
Oscillator frequency
Maximum duty cycle
SYNC input high
SYNC input low
SYNC output current
*
*
99
510
87
2.0
-
-
106
580
-
-
-
18
118
650
93
-
0.8
-
kHz
kHz
%
V
V
µA
R
T
= 500kΩ
R
T
= 96kΩ
---
---
---
---
Output Short Circuit
Gain for short circuit comparator
Minimum output voltage of the
gain stage
Propagation time for short circuit
detection
Fault output rise time
Fault output fall time
Blanking time
Current source at COMP pin used
for hiccup mode protection
Current sourced out of SC pin
Internal current mirror ratio
*
0
1.8
*
500
*
1.9
0.125
2.0
-
2.1
0.25
V
V
---
I
REF
= GND
PWMD = V
DD
, I
REF
= 400mA;
FDBK step from 0 to 900mV;
FAULT goes from high to low
330pF capacitor at FAULT pin
330pF capacitor at FAULT pin
---
---
T
OFF
T
RISE,FAULT
T
FALL,FAULT
T
BLANK,SC
I
HICCUP
-
-
-
-
-
-
5.0
250
300
300
700
-
ns
ns
ns
ns
µA
Slope Compensation
I
SLOPE
G
SLOPE
-
2.0
100
2.2
µA
-
---
I
SLOPE
= 50µA ; R
SC
= 1.0kΩ
Notes:
(1) See Application Information for Minimum Input Voltage.
* The specifications which apply over the full operating temperature range at 0
O
C < T
A
< +85
O
C are guaranteed by design and characterization.
# Denotes specifications guaranteed by design.
4
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