TDA4867J Datasheet, PDF (5/14 Pages) NXP Semiconductors – Full bridge current driven vertical deflection booster

Philips Semiconductors
Full bridge current driven vertical
deflection booster
Preliminary specification
TDA4867J
Protection
The output stages are protected against:
• Thermal overshoot in normal operation
• Short-circuit of the coil (pins OUTB and OUTA).
Guard circuit
The internal guard circuit provides a blanking signal for the
CRT. The guard signal is active HIGH:
• At thermal overshoot
• During flyback
• When missing flyback supply voltage
• When power supply voltage too low, V_P < V_P(min).
The internal guard circuit will not be activated, if the input
signals on pins INP and INN delivered from the driver
circuit are out of range or at short-circuit of the coil
(pins OUTB and OUTA).
For this reason an external guard circuit can be applied to
detect failures of the deflection (see Fig.5). This circuit will
be activated when flyback pulses are missing, which is the
indication of any abnormal operation.
The guard output pin can be used as input for the power
save mode. A current or a voltage has to be applied to the
pin. In this case the output stages are switched off
completely.
LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC 60134); voltages referenced to ground (pin GND);
unless otherwise specified.
SYMBOL
PARAMETER
V_P
supply voltage
V_FB
flyback supply voltage
I_FB
flyback supply current
V_INP, V_INN input voltage
I_INP, I_INN
input current
V_OUTB
output voltage on pin OUTB
V_OUTA
output voltage on pin OUTA
I_OUTB, I_OUTA output current
V_FEEDB
feedback voltage
I_FEEDB
feedback current
V_GUARD
guard voltage
I_GUARD
guard current
T_stg
storage temperature
T_amb
ambient temperature
T_j
junction temperature
V_esd
electrostatic discharge voltage
CONDITIONS MIN.
0
0
0
0
0
0
0
note 1
0
0
0
0
0
−20
−20
note 2
−20
note 3
note 4
−4 000
−250
MAX.
30
60
±1.8
5
±5
V_P
V_FB
±1.6
V_P
±5
10
±5
+150
+75
+150
+4 000
+250
UNIT
V
V
A
V
mA
V
V
A
V
mA
V
mA
°C
°C
°C
V
V
Notes
1. Maximum output currents I_OUTB and I_OUTA are limited by current protection.
2. Internally limited by thermal protection; will be activated for T_j ≥ 150 °C.
3. Human body model: equivalent to discharging a 100 pF capacitor through a 1.5 kΩ resistor.
4. Machine model: equivalent to discharging a 200 pF capacitor through a 0.75 µH inductance.
2003 Feb 05
5