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TEA1732CTS 데이터시트 PDF




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부품번호 TEA1732CTS 기능
기능 GreenChip SMPS control IC
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TEA1732CTS 데이터시트, 핀배열, 회로
TEA1732CTS
GreenChip SMPS control IC
Rev. 1 — 18 March 2014
Product data sheet
1. General description
The TEA1732CTS is a low cost Switched Mode Power Supply (SMPS) controller IC
intended for flyback topologies. The TEA1732CTS operates in peak current and
frequency control mode. Frequency jitter has been implemented to reduce
ElectroMagnetic Interference (EMI). Slope compensation is integrated for Continuous
Conduction Mode (CCM) operation.
The TEA1732CTS IC features OverPower Protection (OPP). The controller accepts an
overpower situation for a limited amount of time.
Mains undervoltage protection (brownout), output OverVoltage Protection (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.
The switching frequency is reduced to limit the 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 TEA1732CTS makes the design of low-cost, highly efficient and reliable supplies for
power requirements up to 75 W easier by requiring a minimum number of external
components.
2. Features and benefits
SMPS controller IC enabling low-cost applications
Large input voltage range (12 V to 30 V)
Integrated OverVoltage Protection (OVP) on the VCC pin
Accurate OverVoltage Protection (OVP) via the ISENSE pin
Very low supply current during start-up and restart (10 A typical)
Low supply current during normal operation (0.58 mA typical without load)
Internal overpower time-out
Overpower protection or high/low line compensation
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
Frequency increase at peak power operation
Slope compensation for CCM operation
Integrated soft-start




TEA1732CTS pdf, 반도체, 판매, 대치품
NXP Semiconductors
TEA1732CTS
GreenChip SMPS control IC
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7.2 Start-up and UnderVoltage LockOut (UVLO)
Initially, the capacitor on the VCC pin, C3, is charged from the high-voltage mains via
resistor R1.
As long as VCC is below Vstartup, the IC current consumption is low (10 A typical). When
VCC reaches Vstartup, the IC first waits for the mains voltage to exceed the brownin level,
and the PROTECT pin to reach the Vdet(PROTECT)(L) voltage. When both conditions are
met, the IC starts switching. An internal soft-start time of 3.5 ms allows the ISENSE peak
voltage to increase gradually to prevent audible noise. In a typical application, the
auxiliary winding of the transformer takes over the supply voltage.
If a protection is triggered, the controller stops switching. Depending on the protection
triggered, it either causes a restart or latches the converter to an off-state.
The OPP, UVLO, brownout, maximum duty cycle, OVP, and external OTP protections
cause a save restart. The internal OTP protection latches the converter to an off-state.
A restart protection disables the switching of the IC. The supply voltage of the IC drops to
the UVLO level. When the UVLO level is reached, the IC switches to Power-down mode,
where it consumes a low supply current (10 A typical). The VCC capacitor is recharged
via R1 until the VCC start-up level is reached. A delayed restart is performed to lower the
average input power during a fault condition. Depending on the cause of the restart
protection, the restart sequence that discharges and recharges the VCC capacitor is
performed once or repeated three times, before switching recommences (See Figure 4).
When a latched protection is triggered, the TEA1732CTS immediately enters Power-down
mode. The VCC pin is clamped to a voltage just above the latch protection reset voltage
(Vrst(latch) + 0.9 V).
TEA1732CTS
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 18 March 2014
© NXP Semiconductors N.V. 2014. All rights reserved.
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TEA1732CTS 전자부품, 판매, 대치품
NXP Semiconductors
TEA1732CTS
GreenChip SMPS control IC
7.7 Overpower timer
A temporary overload situation is allowed. If Vctrl(Ipeak) (see Figure 1) set by pin CTRL
exceeds 400 mV, an internal timer is started. If the overload situation continues to exist for
more than 60 ms (typical), an OverPower Protection (OPP) is triggered (see Figure 7).
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The TEA1732CTS enters the overpower restart mode when the overload time-out is
reached. In overpower restart mode, the VCC capacitor is discharged to UVLO level and
then charged to the start-up level three times before the converter switches again.
7.8 Current mode control (pin ISENSE)
Current mode control is used because it ensures a good line regulation.
Pin ISENSE senses the primary current across external resistor R6 and compares it with
an internal control voltage. The internal control voltage is proportional to the CTRL pin
voltage (see Figure 8).
TEA1732CTS
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 18 March 2014
© NXP Semiconductors N.V. 2014. All rights reserved.
7 of 20

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TEA1732CTS

GreenChip SMPS control IC

NXP Semiconductors
NXP Semiconductors

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