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부품번호 | TEA1733T 기능 |
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기능 | GreenChip SMPS control IC | ||
제조업체 | NXP Semiconductors | ||
로고 | |||
전체 21 페이지수
TEA1733T
GreenChip SMPS control IC
Rev. 7 — 11 July 2013
Product data sheet
1. General description
The TEA1733T is a low cost Switched Mode Power Supply (SMPS) controller IC intended
for flyback topologies. It operates in fixed frequency mode. To reduce ElectroMagnetic
Interference (EMI), frequency jitter has been implemented. Slope compensation is
integrated for Continuous Conduction Mode (CCM) operation.
The TEA1733T includes OverPower Protection (OPP). This enables the controller to
operate under overpower situations for a limited amount of time.
Two pins, VINSENSE and PROTECT, are reserved for protection purposes. Input
UnderVoltage Protection (UVP) and OverVoltage Protection (OVP), output OVP and
OverTemperature Protection (OTP) can be implemented using a minimal number of
external components.
At low power levels the primary peak current is set to 25 % of the maximum peak current
and the switching frequency is reduced to limit switching losses. The combination of fixed
frequency operation at high output power and frequency reduction at low output power
provides high-efficiency over the total load range.
The TEA1733T enables low cost, highly efficient and reliable supplies for power
requirements up to 75 W to be designed easily and with a minimum number of external
components.
2. Features and benefits
2.1 Features
SMPS controller IC enabling low-cost applications
Large input voltage range (12 V to 30 V)
Very low supply current during start-up and restart (typically 10 A)
Low supply current during normal operation (typically 0.5 mA without load)
Overpower or high/low line compensation
Adjustable overpower time-out
Adjustable overpower restart timer
Fixed switching frequency with frequency jitter to reduce EMI
Frequency reduction with fixed minimum peak current to maintain high-efficiency at
low output power levels
Slope compensation for CCM operation
Low and adjustable OverCurrent Protection (OCP) trip level
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NXP Semiconductors
6. Pinning information
6.1 Pinning
TEA1733T
GreenChip SMPS control IC
VCC 1
GND 2
DRIVER 3
ISENSE 4
8 OPTIMER
7 CTRL
TEA1733T
6 PROTECT
5 VINSENSE
001aan637
Fig 2. Pinning diagram SOT96-1 (SO8)
6.2 Pin description
Table 2. Pin description
Symbol
Pin
VCC
1
GND
2
DRIVER
3
ISENSE
4
VINSENSE
5
PROTECT
6
CTRL
7
OPTIMER
8
Description
supply voltage
ground
gate driver output
current sense input
input voltage protection input
general purpose protection input
control input
overpower and restart timer
TEA1733T
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 7 — 11 July 2013
© NXP B.V. 2013. All rights reserved.
4 of 21
4페이지 NXP Semiconductors
TEA1733T
GreenChip SMPS control IC
The PROTECT input can be used to create overvoltage detection and OTP functions.
A small capacitor can be connected to the pin if the protections on this pin are not used.
An internal clamp of 4.1 V (typical) protects this pin from overvoltages.
7.6 Duty cycle control (CTRL pin)
The output power of the converter is regulated by the CTRL pin. This pin is connected to
an internal 5.4 V supply using an internal 7 k resistor.
The CTRL pin voltage sets the peak current which is measured using the ISENSE pin
(see Section 7.10). At a low output power the switching frequency is also reduced (see
Section 7.12). The maximum duty cycle is limited to 72 % (typical).
7.7 Slope compensation (CTRL pin)
A slope compensation circuit is integrated in the IC for CCM. Slope compensation
guarantees stable operation for duty cycles greater than 50 %.
7.8 Overpower timer (OPTIMER pin)
If the OPTIMER pin is connected to capacitor C4 (see Figure 3), a temporary overload
situation is allowed. Vctrl(Ipeak) (see Figure 1) is set by the CTRL. When Vctrl(Ipeak) is above
400 mV, the IIO(OPTIMER) current (11 A typical) is sourced from the OPTIMER pin. If the
voltage on the OPTIMER pin reaches the Vprot(OPTIMER) voltage (2.5 V typical) the
OverPower Protection (OPP) is triggered (see Figure 5).
IO
VO
VISENSE
400 mV
VOPTIMER
high load
normal
load
high load
Vprot(OPTIMER)
protection
Fig 5. Overpower delay
014aaa930
When the Vprot(OPTIMER) voltage is reached the device restarts. If the overload is removed
before the Vprot(OPTIMER) voltage is reached, the converter will continue switching.
TEA1733T
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 7 — 11 July 2013
© NXP B.V. 2013. All rights reserved.
7 of 21
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부품번호 | 상세설명 및 기능 | 제조사 |
TEA1733 | GreenChip SMPS control IC | NXP Semiconductors |
TEA1733AT | GreenChip SMPS control IC | NXP Semiconductors |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |