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零件编号 | VIPER06 | ||
描述 | Fixed-frequency VIPer plus family | ||
制造商 | STMicroelectronics | ||
LOGO | |||
1 Page
VIPER06
Fixed-frequency VIPer™ plus family
Features
■ 800 V avalanche rugged power section
■ PWM operation with frequency jittering for low
EMI
■ Operating frequency:
– 30 kHz for VIPER06Xx
– 60 kHz for VIPER06Lx
– 115 kHz for VIPER06Hx
■ No need for an auxiliary winding in low-power
applications
■ Standby power < 30 mW at 265 VAC
■ Limiting current with adjustable set point
■ On-board soft-start
■ Safe auto-restart after a fault condition
■ Hysteretic thermal shutdown
Applications
■ Replacement of capacitive power supplies
■ Home appliances
■ Power metering
■ LED drivers
Description
The VIPER06 is an offline converter with an 800 V
avalanche rugged power section, a PWM
controller, a user-defined overcurrent limit, open-
loop failure protection, hysteretic thermal
protection, soft startup and safe auto-restart after
any fault condition. The device is able to power
itself directly from the rectified mains, eliminating
the need for an auxiliary bias winding. Advanced
frequency jittering reduces EMI filter cost. Burst
mode operation and the device’s very low power
consumption both help to meet the standards set
by energy-saving regulations.
Datasheet — production data
SSO10
DIP-7
Figure 1. Typical application
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$# OUTPUT VOLTAGE
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March 2012
This is information on a product in full production.
Doc ID 022794 Rev 1
1/28
www.st.com
28
Electrical data
Table 7. Controller section
Symbol
Parameter
Error amplifier
VREF_FB FB reference voltage
IFB_PULL UP Current pull-up
GM Transconductance
Current setting (LIM) pin
VLIM_LOW Low-level clamp voltage
Compensation (COMP) pin
VCOMPH Upper saturation limit
VCOMPL Burst mode threshold
VCOMPL_HYS Burst mode hysteresis
HCOMP ΔVCOMP / ΔIDRAIN
RCOMP(DYN) Dynamic resistance
ICOMP
Source / sink current
Max source current
Current limitation
IDlim Drain current limitation
tSS
TON_MIN
IDlim_bm
Overload
Soft-start time
Minimum turn-on time
Burst mode current limitation
tOVL
tRESTART
Overload time
Restart time after fault
Oscillator section
FOSC Switching frequency
FD Modulation depth
FM
DMAX
Modulation frequency
Maximum duty cycle
VIPER06
Test condition
Min Typ Max Unit
3.2 3.3 3.4 V
-1 μA
2 mA/V
ILIM = -100 μA
0.5 V
TJ = 25 °C
TJ = 25 °C
TJ = 25 °C
VFB = GND
VFB > 100 mV
VCOMP = GND, VFB = GND
3V
1 1.1 1.2 V
40 mV
4 9 V/A
15 kΩ
150 μA
220 μA
ILIM = -10 μA, VCOMP = 3.3 V,
TJ = 25 °C
0.32 0.35 0.38
8.5
A
ms
450 ns
VCOMP = VCOMPL
85 mA
50 ms
1s
VIPER06Xx
VIPER06Lx
VIPER06Hx
FOSC = 30 kHz
FOSC = 60 kHz
FOSC = 115 kHz
27 30 33 kHz
54 60 66 kHz
103 115 127 kHz
±3 kHz
±4 kHz
±8 kHz
230 Hz
70 80 %
8/28 Doc ID 022794 Rev 1
Oscillator
9 Oscillator
VIPER06
The switching frequency is internally fixed at 30 kHz or 60 kHz or 115 kHz (respectively part
numbers VIPER06Xx, VIPER06Lx and VIPER06Hx).
The switching frequency is modulated by approximately ±3 kHz (30 kHz version) or ±4 kHz
(60 kHz version) or ±8 kHz (115 kHz version) at 230 Hz (typical) rate, so that the resulting
spread spectrum action distributes the energy of each harmonic of the switching frequency
over a number of sideband harmonics having the same energy on the whole, but smaller
amplitudes.
10 Soft startup
During the converter’s startup phase, the soft-start function progressively increases the
cycle-by-cycle drain current limit, up to the default value IDlim. In this way the drain current is
further limited and the output voltage is progressively increased, reducing the stress on the
secondary diode. The soft-start time is internally fixed to tSS, see typical value
in Table 7 on page 8, and the function is activated for any attempt of converter startup and
after a fault event.
This function helps prevent saturation of the transformer during startup and short-circuit.
11 Adjustable current limit set point
The VIPER06 includes a current-mode PWM controller. The drain current is sensed cycle-
by-cycle through the integrated resistor RSENSE and the voltage is applied to the non-
inverting input of the PWM comparator, see Figure 2 on page 4. As soon as the sensed
voltage is equal to the voltage derived from the COMP pin, the power MOSFET is switched
OFF.
In parallel with the PWM operations, the comparator OCP, see Figure 2 on page 4, checks
the level of the drain current and switches OFF the power MOSFET in case the current is
higher than the threshold IDlim, see Table 7 on page 8.
The level of the drain current limit IDlim can be reduced using a resistor RLIM connected
between the LIM and GND pins. Current is sunk from the LIM pin through the resistor RLIM
and the setup of IDlim depends on the level of this current. The relation between IDlim and
RLIM is shown in Figure 13 on page 11.
When the LIM pin is left open or if RLIM has a high value (i.e. > 80 kΩ), the current limit is
fixed to its default value, IDlim, as given in Table 7 on page 8.
16/28
Doc ID 022794 Rev 1
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页数 | 28 页 | ||
下载 | [ VIPER06.PDF 数据手册 ] |
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