HF920 – 900V, FIXED-FREQUENCY, OFFLINE SWITCHING REGULATOR
HF920 Rev. 1.02 www.MonolithicPower.com 5
12/3/2018 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2018 MPS. All Rights Reserved.HF920
ELECTRICAL CHARACTERISTICS
VCC = 12V, T
J
= -40°C to 125°C, min and max values are guaranteed by characterization, typical
values are tested under 25°C, unless otherwise noted.
Parameter Symbol Conditions Min Typ Max Unit
Start-Up Current Source and Internal MOSFET (D Pin)
Supply current from drain I
Charge
VCC = V
CCH
- 0.1V, V
D
= 400V 1 2 3 mA
Leakage current from drain I
Leak
V
D
= 400V, V
GS
= 0V, T
J
= 25°C 1
μA
V
D
= 400V, V
GS
= 0V 10
Breakdown voltage V
(BR)DSS
900 V
On-state resistance R
DS(ON)
VCC = 10V,
I
D
= 100mA
T
J
= 25°C 15 18 Ω
T
J
= 125°C 25 29 Ω
Supply Voltage Management (VCC Pin)
VCC upper level at which
the IC switch turns on
V
CCH
12 13 14 V
VCC lower level at which
the IC switch turns off
V
CCL
8.4 9 9.6 V
VCC hysteresis V
CC_HYS
3 4 5 V
VCC OVP level V
OVP
24.4 25.5 26.5 V
VCC OVP delay time t
OVP
70 μs
VCC recharge level after
protections
V
CCR
4.8 5.5 6.2 V
Quiescent current during
protections
I
Pro
VCC = V
CCL
300 μA
Quiescent current I
Q
VCC = V
CCH
- 0.1V 200 300 μA
Operation current I
CC
VCC =13V, f
S
= 100kHz 510 610 μA
VCC = 13V, FB = 0V 300 400 μA
Feedback Management (FB Pin)
Internal pull-up resistor R
FB
Normal operating 39 kΩ
Internal pull-up voltage V
UP
4.1 4.4 4.7 V
FB to current-set-point
division ratio
K
div
3.4 3.7
Internal soft-start time t
SS
6.7 ms
FB decreasing level at
which the regulator enters
burst mode
V
BURL
0.4 0.5 0.6 V
FB increasing level at
which the regulator leaves
burst mode
V
BURH
0.6 0.7 0.8 V
Overload set point V
OLP
3.3 3.65 4 V
Overload counter 8192
Threshold for frequency to
recover
V
FR
C
FSET
= 1nF 2.85 3 3.15 V
Frequency doubling entry/
recovery counter
C
FSET
= 1nF 31
Frequency Setting (FSET Pin)
FSET reference voltage V
FSET
1.18 1.25 1.32 V
Frequency spectrum
jittering range, in
percentage of Fs
R
Jittering
±3.5 %
Typical operating
frequency
f
S
R
FSET
= 200kΩ 43 49 55
kHz
R
FSET
= 200kΩ, C
FSET
= 1nF,
V
FB
= 3.5V
87 99 111
Maximum switching duty D
max
79 83 87 %
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