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参数资料
| 型号： | TEA1761T/N2 |
| 厂商： | NXP SEMICONDUCTORS |
| 元件分类： | 稳压器 |
| 英文描述： | 1.4 A SWITCHING CONTROLLER, PDSO8 |
| 封装： | 3.90 MM, PLASTIC, MS-012, SOT-96-1, SOP-8 |
| 文件页数： | 12/13页 |
| 文件大小： | 78K |
| 代理商： | TEA1761T/N2 |
TEA1761T_2
NXP B.V. 2007. All rights reserved.
Product data sheet
Rev. 02 — 25 April 2007
8 of 13
NXP Semiconductors
TEA1761T
GreenChip synchronous rectier controller
[1]
The VCC stop voltage is Vstartup Vhys.
11. Application information
A switched mode power supply with the TEA1761T consists of a primary side
discontinuous conduction mode yback controller, a transformer, and an output stage with
a feedback circuit. In the output stage a MOSFET (Qsec) is used for low conduction
losses. The MOSFET is controlled by the TEA1761T. The output voltage and/or current is
also controlled by the TEA1761T via the opto coupler connection to the primary side. See
The output voltage is set by resistors Rfb1 and Rfb2. The output current is controlled by
the resistor Risense. The timing for the synchronous rectier switch is derived from the
voltage sensed on the SRSENSE pin. The resistor in the SRSENSE connection is needed
to protect the TEA1761T from excessive voltages. The SRSENSE resistor should typically
be 1 k
. Higher values might impair correct timing, lower values may not provide sufcient
protection.
Opto output (pin OPTO)
IO(max)
maximum output current VOPTO >5V
4
5
12
mA
VO(min)
minimum output voltage
IOPTO = 4 mA
-
3.5
V
Voltage sense (pin VSENSE)
Vreg(VSENSE)
regulation voltage on pin
VSENSE
See Figure 4
2.475
2.5
2.525
V
II(VSENSE)
input current on pin
VSENSE
VVSENSE =Vreg(VSENSE)
100 0
+100
nA
gm
transconductance
VVSENSE to IOPTO
-
40
-
A/V
GB
gain bandwidth product
RL =1k
1
MHz
Current sense (pin ISENSE)
Vreg(ISENSE)
regulation voltage on pin
ISENSE
46
50
54
mV
II(reg)(ISENSE)
regulation input current
on pin ISENSE
VISENSE =Vreg(ISENSE)
200 100 0
nA
gm
transconductance
VISENSE to IOPTO
-
15
-
A/V
GB
gain bandwidth product
RL =1k
1
-
MHz
Temperature protection
Tpl(max)
maximum protection
level temperature
140
150
-
°C
Tpl(hys)
protection level
hysteresis temperature
-12
-
°C
Table 5.
Characteristics …continued
Tamb =25 °C; VCC = 20 V; all voltages are measured with respect to ground (pin 2); currents are positive when owing into
the IC; unless otherwise specied.
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
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相关代理商/技术参数 |
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| TEA1762T | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:GreenChip synchronous rectifier controller |
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