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PDF TEA1833TS Data sheet ( Hoja de datos )
| Número de pieza | TEA1833TS | |
| Descripción | GreenChip SMPS control IC | |
| Fabricantes | NXP Semiconductors | |
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TEA1833TS
GreenChip SMPS control IC
Rev. 1 — 31 August 2015
Product data sheet
1. General description
The TEA1833TS is a low-cost Switched Mode Power Supply (SMPS) controller IC
intended for flyback topologies. The TEA1833TS 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 TEA1833TS IC features OverPower Protection (OPP). The controller accepts an
overpower situation up to 200 % for a limited amount of time.
Mains undervoltage protection (brownin/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 22 % 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 TEA1833TS makes the design of low-cost, highly efficient and reliable supplies
easier by requiring a minimum number of external components. The device is especially
suited for medium power applications.
2. Features and benefits
SMPS controller IC enabling low-cost applications
Large input voltage range (10.5 V to 36 V)
Integrated OverVoltage Protection (OVP) on the VCC pin
Accurate OverVoltage Protection (OVP) via the ISENSE pin
Dedicated burst mode, allowing a low VCC capacitor value
Very low supply current during start-up and restart (11 A typical)
Low supply current during normal operation (0.58 mA typical without load)
Adaptive internal overpower time-out
Overpower protection including 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
Peak power operation up to 200 % by frequency increase and peak current increase
Slope compensation for CCM operation
1 page  
NXP Semiconductors
TEA1833TS
GreenChip SMPS control IC
7. Functional description
7.1 General control
The TEA1833TS contains a controller for a flyback circuit. A typical configuration is shown
in Figure 3.
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Fig 3. TEA1833TS typical configuration
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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 the voltage on the VCC pin is below Vstartup, the IC current consumption is low
(11 A typical). When the voltage on the VCC pin reaches Vstartup, the IC first checks the
PROTECT pin. Only when the current exceeds the brownin level (Imains(bi)) during mains
detect and the voltage surpasses Vdet(PROTECT) during external OTP measurement 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, brownin/brownout, maximum duty cycle protections cause a safe restart.
The internal and external OVP and the internal and external OTP latch 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 (11 A typical). The VCC capacitor is recharged
via R1 until the VCC start-up level is reached. The IC starts switching again.
The OPP protection performs a slow restart to lower the average input power during a
fault condition. The restart sequence that discharges and recharges the VCC capacitor is
performed three times, before switching recommences (see Figure 4).
TEA1833TS
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 31 August 2015
© NXP Semiconductors N.V. 2015. All rights reserved.
5 of 25
5 Page 
NXP Semiconductors
TEA1833TS
GreenChip SMPS control IC
The output voltage can drop, for instance, because a load is too high or a short circuit
event occurs. If the output voltage drops, the decrease of the transformer current during
the secondary stroke time (tsec) becomes less. As a result, the next cycle starts at a higher
peak current.
Also, at the next cycle, the minimum on-time equals the blanking time. During this
blanking time, the peak current can increase to above the targeted regulation level. If the
transformer current does not decrease sufficiently during the secondary stroke, the peak
current can continuously increase to such a level that the transformer saturates
(see Figure 10).
To avoid this continuous peak current increase, also called runaway, the IC features a
special protection (see Figure 11).
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Fig 11. OSCP peak current runaway
If the system detects that the peak current already exceeds the targeted level after 1 s,
the next switching period time is extended from 7.7 s (fsw = 130 kHz) to 28 s
(fsw = 36 kHz). The time of the secondary stroke is then sufficient to decrease the
transformer current to below the targeted peak current again.
To avoid activation at low loads, the OSCP is only enabled when the overpower timer is
active. Additionally, to avoid activation during peak power, Vout must be below half the
OVP level.
The Vout level is measured on the ISENSE pin in a similar way the overvoltage protection
is measured.
To limit the input power during a short circuit or an overload event, the OPP time is
reduced to 50 % when OSCP is enabled.
TEA1833TS
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 31 August 2015
© NXP Semiconductors N.V. 2015. All rights reserved.
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