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| 型号： | PFS757HG |
| 厂商： | POWER INTEGRATIONS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 1.82 A SWITCHING CONTROLLER, 70 kHz SWITCHING FREQ-MAX, PZIP16 |
| 封装： | HALOGEN FREE AND ROHS COMPLIANT, PLASTIC, SIP-16 |
| 文件页数： | 3/36页 |
| 文件大小： | 4692K |
| 代理商： | PFS757HG |
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Rev. C 02/11
11
TFS757-764HG
www.powerint.com
Main Reset Overvoltage Detection
There is also an overvoltage threshold for the RESET pin. When
triggered, the RESET overvoltage will shutdown only the Main,
leaving the Standby in operation.
Standby Power General Introduction
The standby is a wide range power supply, typically a flyback
converter, operating over a wide input range (85-265 VAC) and
delivering up to 20 W continuous output power. The standby
power supply provides two functions in most high-power
applications. It provides a direct secondary output but also
provide bias power to other primary-side devices (in particular
typically a PFC boost converter).
The HiperTFS standby retains most features of the TinySwitch-III,
such as auto-restart, thermal shutdown, multi-level current limit
ON/OFF control, etc. The HiperTFS standby controller has a
few differences versus TinySwitch-III:
1. There are 4 current limits that are selected via the ENABLE
pin (rather than by using different BYPASS pin capacitors as
in TinySwitch-III). There are 4 user selectable current limits
500, 550, 650, 750 mA design for secondary standby
output power of 10, 12.5, 15 and 20 W.
2. Secondary OVP latching shutdown. This is triggered via a
current in excess of the BYPASS pin latching shutdown
threshold (I
BP(SD) = 15 mA).
3. Dedicated LINE-SENSE pin for line-voltage detection providing
absolute UV and OV ON/OFF thresholds (unlike TinySwitch-III
which detects input voltage only during restart).
4. Current limit is compensated as a function of input voltage
to maintain a flat overload characteristic versus input voltage.
In a high-power system, the standby power supply is the first
power supply to begin operating. The main converter cannot
begin working until the standby is in operation. Likewise the
main converter will shutdown at a higher-voltage than the standby
and thus the standby is always the last power supply to
shutdown.
Standby On-Chip Current Limit with External Selection
During start-up, the FEEDBACK pin and ENABLE pin are both
used to select internal current limits for the Main and Standby
converters respectively. The detection period occurs at the
initial start-up of the device (just after BYPASS pin voltage of
4.7 V is achieved), and before the main or standby MOSFETs
start switching. This is done to minimize noise interference.
The ENABLE pin works in a similar way to the FEEDBACK pin
selection. The only difference being that the ENABLE pin is not
clamped to 1 V during selection, instead remaining at 2.35 V
during the detection period. Thus the selection resistor values
Figure 10. Main and Standby Start-Up.
I EN
(Threshold)
I
LIMIT
R EN (Select)
(1%)
0.0-8.5 mA
L1
500
mA
Open
kW
8.5-17.7 mA
L2
650
mA
280.0
kW
17.7-33.0 mA
L3
750
mA
137.0
KW
33.0-66.0 mA
L4
550
mA
63.4
kW
Table 4.
ENABLE Pin Standby Current Limit Selection.
VIN
Supply Start-Up Sequence
Standby
Output
Main
Output
VBP
12 ms
385 V
315 V
100 V
30 V
2-20 ms
6.0 V
4.7 V
5.7 V
PI-5611a-062710
Figure 11. L and R Pin Duty Limit Mode.
VIN
Standby
Output
Main
Output
385 V
300 V
240 V
40 V
PI-5612a-060910
tHOLDUP
≥ 20 ms
Typically turned off by
secondary supervisor
circuit, once regulation
below limit
t1 t2
t3
t4
RL
RR
To VIN
To Clamp
Reset Circuit
R
HiperTFS
L
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