TEA1532P NXP Semiconductors, TEA1532P Datasheet - Page 6

• Manufacturer Part Number: TEA1532P
• Description: Greenchip Tm Ii Smps Control Ic
• Manufacturer: NXP Semiconductors

Philips Semiconductors
9397 750 14319
Product data sheet
7.1 Start-up, mains enabling operation level and undervoltage lock out
7.2 Supply management
7.3 Current control mode
In fixed frequency continuous conduction mode, which can be activated by grounding
pin DEM, the internal oscillator determines the start of the next converter stroke.
In both operating modes, a cycle skipping mode is activated at very low power (standby)
levels.
Refer to
voltage via pin DRAIN. Supply capacitor C
current source to a level of about 4 V or higher, depending on the drain voltage. Once the
drain voltage exceeds the V
current source will continue charging capacitor C
Figure
passes the V
(green function). The IC supply is taken over by the auxiliary winding of the flyback
converter.
The moment the voltage on pin V
stops switching and performs a safe restart from the rectified mains voltage. In the safe
restart mode the driver output is disabled and pin V
All (internal) reference voltages are derived from a temperature compensated, on-chip
band gap circuit.
Current control mode is used for its good line regulation behavior.
The on-time is controlled by an internal control voltage, which is compared with the
primary current information. The primary current is sensed across an external resistor.
The driver output is latched in the logic, preventing multiple switch-on.
The internal control voltage is inversely proportional to the external pin CTRL voltage, with
an offset of 1.5 V. This means that a voltage range from 1 V to approximately 1.5 V on
pin CTRL will result in an internal control voltage range from 0.5 V to 0 V (a high external
control voltage results in a low duty cycle).
Fig 6. The V
1. The IC will activate the power converter as soon as the voltage on pin V
Figure 10
start
sense(max)
level. At this moment the IC supply from the high voltage pin is stopped
and
Rev. 02 — 4 February 2005
voltage as a function of V
Figure
V
sense(max)
25 mV
0.52 V
m
(mains-dependent operation-enabling level), the start-up
TEA1532(A)P; TEA1532(A)T
11. Initially, the IC is self supplying from the rectified mains
(V)
CC
(typ)
drops below V
1 V
VCC
(at pin 1) is charged by the internal start-up
CTRL
VCC
UVLO
CC
1.5 V
(typ)
(switch S1 will be opened); see
voltage is recharged via pin DRAIN.
(undervoltage lock out), the IC
Cycle
skip
active
GreenChip II SMPS control IC
coa016
V
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
CTRL
(V)
CC
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