TEA1832TS All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2014. All rights reserved.
Product data sheet Rev. 1 — 16 December 2014 13 of 23
NXP Semiconductors
TEA1832TS
GreenChip SMPS control IC
7.14 Burst mode
If the CTRL voltage (V
CTRL
) is < 1.45 V, the system is not switching. It waits until the V
CTRL
exceeds this minimum level before starting the next cycle. During this period, the
TEA1832TS discharges the primary VCC capacitor. If the voltage on the VCC pin then
drops to below the burst threshold level (V
th(burst)
), the system asserts two DRIVER pulses
to recharge the VCC capacitor. The assertion avoids that the voltage on the VCC pin
drops to below the UVLO level during a large off-time.
Worst off-time occurs when there is a load transient from peak load to no-load. The output
voltage shows an overshoot and stops switching until the output voltage drops to below
the regulation level while there is no-load at the output.
For minimum no-load input power, the chosen value of the external capacitor at the VCC
pin must be high enough to prevent that the voltage on the VCC pin drops below the burst
threshold level at continuous no-load operation. The burst mode is only intended to assist
at load changes until the output voltage drops to below the regulation level while there is
no-load at the output.
7.15 Driver (pin DRIVER)
The driver circuit to the gate of the power MOSFET has a current sourcing capability of
typically 300 mA and a current sink capability of typically 750 mA. These capabilities
enable a fast turn-on and turn-off of the power MOSFET for efficient operation.
7.16 OverTemperature Protection (OTP)
If the junction temperature exceeds the thermal shutdown limit, integrated
overtemperature protection ensures that the IC stops switching.
OTP is a latched protection. It can be reset by removing the voltage on pin VCC.
8. Limiting values
Table 3. Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134).
Symbol Parameter Conditions Min Max Unit
Voltages
V
CC
supply voltage 0.4 +40 V
V
PROTECT
voltage on pin PROTECT current limited 0.4 +5 V
V
CTRL
voltage on pin CTRL 0.4 +5.5 V
V
ISENSE
voltage on pin ISENSE current limited to
2mA
0.7 +5 V
Currents
I
VCC
current on pin VCC <10% - 0.4 A
I
I(PROTECT)
input current on pin
PROTECT
1+1mA
I
CTRL
current on pin CTRL 30 mA
I
ISENSE
current on pin ISENSE 10 +0.5 mA
I
DRIVER
current on pin DRIVER <10% 0.4 +1 A
