HV9931 查看數據表（PDF） - Supertex Inc
零件编号
产品描述 (功能)
生产厂家
HV9931 Datasheet PDF : 8 Pages
| |||
HV9931
Typical Performance Characteristics (T = 25OC, V =100V unless otherwise noted)
J
IN
VDD vs. Junction Temperature (LIN = 2mA)
Blanking Delay vs. Junction Temperature
7.7
300
7.65
7.6
7.55
7.5
7.45
-40 -20
0
20
40
60
80
Junction Tem perature (°C)
100 120
250
200
150
100
50
0
-40 -20
0
20
40
60
80
Junction Tem perature (°C)
100 120
Frequency vs. Junction Temperature (RT = 226K)
93
92
91
90
89
88
-40 -20
0
20
40
60
80
Junction Tem perature (°C)
100 120
8
7.5
7
6.5
6
5.5
5
4.5
4
0
VDD vs. Regulator Current (VIN = 100V)
2
4
6
8 10 12 14 16 18 20
IIN (mA)
Functional Description
Power Topology
The HV9931 is optimized to drive Supertex’s proprietary
single-stage, single-switch, non-isolated topology, cascading
an input power factor correction (PFC) buck-boost stage
and an output buck converter power stage. This power
converter topology offers numerous advantages useful
for driving high-brightness light emitting diodes (HB LED).
These advantages include unity power factor, low harmonic
distortion of the input AC line current, and low output current
ripple. The output load is decoupled from the input voltage
with a capacitor making the driver inherently failure-safe for
the output load. The power converter topology also permits
reducing the size of a filter capacitor needed, enabling use
of non-electrolytic capacitors. The latter advantage greatly
improves reliability of the overall solution.
The HV9931 is a peak current-mode controller that is
specifically designed to drive a constant current buck-
boost-buck power converter. This patent pending control
scheme features two identical current sense comparators
for detecting negative current signal levels. One of the
comparators regulates the output LED current, while the
other is used for sensing the input inductor current. The
second comparator is mainly responsible for the converter
start-up. The control scheme inherently features low inrush
current and input under-voltage protection. The HV9931 can
operate with programmable constant frequency or constant
off-time. In many cases, the constant off-time operating mode
is preferred, since it improves line regulation of the output
current, reduces voltage stress of the power components
and simplifies regulatory EMI compliance. (See Application
Note AN-H52.)
4
Share Link: 